JCache.java
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net.sf.ehcache.jcache |
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ehcache |
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/**
* Copyright 2003-2008 Luck Consulting Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ehcache.jcache;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
import net.sf.ehcache.loader.CacheLoader;
import net.sf.jsr107cache.CacheEntry;
import net.sf.jsr107cache.CacheException;
import net.sf.jsr107cache.CacheListener;
import net.sf.jsr107cache.CacheStatistics;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
import java.util.logging.Level;
/**
* Warning: This class is related to the JSR107 specification, which is in draft. It is subject to change without notice.
* <p/>
* A cache implementation that matches the draft JCACHE specification.
* <p/>
* WARNING: The JCache specfication is in draft and this API will change up until the time that JCACHE is finalised.
* <p/>
* It is not possible for one class to implement both JCACHE and Ehcache
* in the same class due to conflicts with method signatures on get and remove.
* <p/>
* This implementation is an adaptor to Ehcache, and will exhibit the same underlying characteristics as Ehcache. Additiona features
* have been added to Ehcache to match the JCache features. All of these features can be configured in ehcache.xml.
* <p/>
* The current JCache CacheManager class, available in the draft, is considered unworkable. Instead, use the Ehcache <code>cacheManager.getJCache(String name)</code>
* to get a JCache. The JCache CacheManager is unlikely to make it into the final spec.
* <p/>
* The recommended creational pattern for JCache is one of:
* <ol>
* <li>Add a cache to ehcache.xml and use <code>cacheManager.getJCache(String name)</code> to access it.
* <li>Create a JCache from an Ehcache, using one of the constructors in this class. Two types of CacheLoader can be specified, in which
* case the underlying Ehcache loader is replaced by the one specified.
* <li>Create an Ehcache from a Cache using its constructor, then a JCache, and then add it to the ehcache CacheManager using <code>cacheManager.addCache(JCache jCache)</code>
* </ol>
* @author Greg Luck
* @version $Id: JCache.java 744 2008-08-16 20:10:49Z gregluck $
* @since 1.3
*/
public class JCache implements net.sf.jsr107cache.Cache {
private static final Logger LOG = Logger.getLogger(JCache.class.getName());
/**
* An Ehcache backing instance
*/
private Ehcache cache;
/**
* A constructor for JCache.
* <p/>
* JCache is an adaptor for an Ehcache, and therefore requires an Ehcache in its constructor.
* <p/>
* @param cache An ehcache
* @since 1.4
* @see "class description for recommended usage"
*/
public JCache(Ehcache cache) {
this.cache = cache;
}
/**
* A constructor for JCache.
* <p/>
* JCache is an adaptor for an Ehcache, and therefore requires an Ehcache in its constructor.
* <p/>
* @param cache An ehcache
* @param cacheLoader used to load entries when they are not in the cache. If this is null, it is
* set for the cache. If null, the JCache will inherit the CacheLoader set for the backing ehcache.
* If specified, the underlying ehcache will have it's loader replaced.
* @since 1.3
* @see "class description for recommended usage"
*/
public JCache(Ehcache cache, net.sf.jsr107cache.CacheLoader cacheLoader) {
this.cache = cache;
if (cacheLoader != null) {
cache.setCacheLoader((CacheLoader) cacheLoader);
}
}
/**
* A constructor for JCache.
* <p/>
* JCache is an adaptor for an Ehcache, and therefore requires an Ehcache in its constructor.
* <p/>
* @param cache An ehcache
* @param cacheLoader used to load entries when they are not in the cache. If this is null, it is
* set for the cache. If null, the JCache will inherit the CacheLoader set for the backing ehcache.
* If specified, the underlying ehcache will have it's loader replaced.
* @since 1.3
* @see "class description for recommended usage"
*/
public JCache(Ehcache cache, CacheLoader cacheLoader) {
this.cache = cache;
if (cacheLoader != null) {
cache.setCacheLoader(cacheLoader);
}
}
/**
* Setter for the CacheLoader. Changing the CacheLoader takes immediate effect.
*
* @param cacheLoader the loader to dynamically load new cache entries. This replaces the CacheLoader in the underlying ehcache.
*/
public void setCacheLoader(CacheLoader cacheLoader) {
cache.setCacheLoader(cacheLoader);
}
/**
* Add a listener to the list of cache listeners. The behaviour of JCACHE and Ehcache listeners is a little
* different. See {@link JCacheListenerAdaptor} for details on how each event is adapted.
*
* @param cacheListener a JCACHE CacheListener
* @see JCacheListenerAdaptor
*/
public void addListener(CacheListener cacheListener) {
JCacheListenerAdaptor cacheListenerAdaptor = new JCacheListenerAdaptor(cacheListener);
cache.getCacheEventNotificationService().registerListener(cacheListenerAdaptor);
}
/**
* The evict method will remove objects from the cache that are no longer valid.
* Objects where the specified expiration time has been reached.
* <p/>
* This implementation synchronously checks each store for expired elements. Note that the DiskStore
* has an expiryThread that runs periodically to do the same thing, and that the MemoryStore lazily checks
* for expiry on overflow and peek, thus reducing the utility of calling this method.
*/
public void evict() {
cache.evictExpiredElements();
}
/**
* The getAll method will return, from the cache, a Map of the objects associated with the Collection of keys in argument "keys".
* If the objects are not in the cache, the associated cache loader will be called. If no loader is associated with an object,
* a null is returned. If a problem is encountered during the retrieving or loading of the objects, an exception will be thrown.
* If the "arg" argument is set, the arg object will be passed to the CacheLoader.loadAll method. The cache will not dereference
* the object. If no "arg" value is provided a null will be passed to the loadAll method. The storing of null values in the cache
* is permitted, however, the get method will not distinguish returning a null stored in the cache and not finding the object in
* the cache. In both cases a null is returned.
* <p/>
* The Ehcache native API provides similar functionality to loaders using the
* decorator {@link net.sf.ehcache.constructs.blocking.SelfPopulatingCache}
* <p/>
* Note. If the getAll exceeds the maximum cache
* size, the returned map will necessarily be less than the number specified.
*
* @param keys
* @return a Map populated from the Cache. If there are no elements, an empty Map is returned.
*/
public Map getAll(Collection keys) throws CacheException {
return getAll(keys, null);
}
/**
* The getAll method will return, from the cache, a Map of the objects associated with the Collection of keys in argument "keys".
* If the objects are not in the cache, the associated cache loader will be called. If no loader is associated with an object,
* a null is returned. If a problem is encountered during the retrieving or loading of the objects, an exception will be thrown.
* If the "arg" argument is set, the arg object will be passed to the CacheLoader.loadAll method. The cache will not dereference
* the object. If no "arg" value is provided a null will be passed to the loadAll method. The storing of null values in the cache
* is permitted, however, the get method will not distinguish returning a null stored in the cache and not finding the object in
* the cache. In both cases a null is returned.
* <p/>
* The Ehcache native API provides similar functionality to loaders using the
* decorator {@link net.sf.ehcache.constructs.blocking.SelfPopulatingCache}
* <p/>
* Note. If the getAll exceeds the maximum cache
* size, the returned map will necessarily be less than the number specified.
*
* @param keys
* @return a Map populated from the Cache. If there are no elements, an empty Map is returned.
*/
public Map getAll(Collection keys, Object loaderArgument) throws CacheException {
return cache.getAllWithLoader(keys, loaderArgument);
}
/**
* Gets the CacheLoader registered in this cache
*
* @return the loader, or null if there is none
*/
public CacheLoader getCacheLoader() {
return cache.getCacheLoader();
}
/**
* returns the CacheEntry object associated with the key.
*
* @param key the key to look for in the cache
*/
public CacheEntry getCacheEntry(Object key) {
Element element = cache.get(key);
if (element != null) {
return new net.sf.ehcache.jcache.JCacheEntry(element);
} else {
return null;
}
}
/**
* Gets an immutable Statistics object representing the Cache statistics at the time. How the statistics are calculated
* depends on the statistics accuracy setting. The only aspect of statistics sensitive to the accuracy setting is
* object size. How that is calculated is discussed below.
* <h3>Best Effort Size</h3>
* This result is returned when the statistics accuracy setting is {@link CacheStatistics#STATISTICS_ACCURACY_BEST_EFFORT}.
* <p/>
* The size is the number of {@link Element}s in the {@link net.sf.ehcache.store.MemoryStore} plus
* the number of {@link Element}s in the {@link net.sf.ehcache.store.DiskStore}.
* <p/>
* This number is the actual number of elements, including expired elements that have
* not been removed. Any duplicates between stores are accounted for.
* <p/>
* Expired elements are removed from the the memory store when
* getting an expired element, or when attempting to spool an expired element to
* disk.
* <p/>
* Expired elements are removed from the disk store when getting an expired element,
* or when the expiry thread runs, which is once every five minutes.
* <p/>
* <h3>Guaranteed Accuracy Size</h3>
* This result is returned when the statistics accuracy setting is {@link CacheStatistics#STATISTICS_ACCURACY_GUARANTEED}.
* <p/>
* This method accounts for elements which might be expired or duplicated between stores. It take approximately
* 200ms per 1000 elements to execute.
* <h3>Fast but non-accurate Size</h3>
* This result is returned when the statistics accuracy setting is {@link CacheStatistics#STATISTICS_ACCURACY_NONE}.
* <p/>
* The number given may contain expired elements. In addition if the DiskStore is used it may contain some double
* counting of elements. It takes 6ms for 1000 elements to execute. Time to execute is O(log n). 50,000 elements take
* 36ms.
*
* @return the number of elements in the ehcache, with a varying degree of accuracy, depending on accuracy setting.
* @throws IllegalStateException if the cache is not {@link net.sf.ehcache.Status#STATUS_ALIVE}
*/
public CacheStatistics getCacheStatistics() throws IllegalStateException {
return new JCacheStatistics(cache.getStatistics());
}
/**
* The load method provides a means to "pre load" the cache. This method will, asynchronously, load the specified
* object into the cache using the associated cacheloader. If the object already exists in the cache, no action is
* taken. If no loader is associated with the object, no object will be loaded into the cache. If a problem is
* encountered during the retrieving or loading of the object, an exception should be logged. If the "arg" argument
* is set, the arg object will be passed to the CacheLoader.load method. The cache will not dereference the object.
* If no "arg" value is provided a null will be passed to the load method. The storing of null values in the cache
* is permitted, however, the get method will not distinguish returning a null stored in the cache and not finding
* the object in the cache. In both cases a null is returned.
* <p/>
* The Ehcache native API provides similar functionality to loaders using the
* decorator {@link net.sf.ehcache.constructs.blocking.SelfPopulatingCache}
*
* @param key key whose associated value to be loaded using the associated cacheloader if this cache doesn't contain it.
*/
public void load(final Object key) throws CacheException {
cache.load(key);
}
/**
* The loadAll method provides a means to "pre load" objects into the cache. This method will, asynchronously, load
* the specified objects into the cache using the associated cache loader. If the an object already exists in the
* cache, no action is taken. If no loader is associated with the object, no object will be loaded into the cache.
* If a problem is encountered during the retrieving or loading of the objects, an exception (to be defined)
* should be logged. The getAll method will return, from the cache, a Map of the objects associated with the
* Collection of keys in argument "keys". If the objects are not in the cache, the associated cache loader will be
* called. If no loader is associated with an object, a null is returned. If a problem is encountered during the
* retrieving or loading of the objects, an exception (to be defined) will be thrown. If the "arg" argument is set,
* the arg object will be passed to the CacheLoader.loadAll method. The cache will not dereference the object.
* If no "arg" value is provided a null will be passed to the loadAll method.
* <p/>
* keys - collection of the keys whose associated values to be loaded into this cache by using the associated
* cacheloader if this cache doesn't contain them.
* <p/>
* The Ehcache native API provides similar functionality to loaders using the
* decorator {@link net.sf.ehcache.constructs.blocking.SelfPopulatingCache}
*/
public void loadAll(final Collection keys) throws CacheException {
loadAll(keys, null);
}
/**
* The loadAll method provides a means to "pre load" objects into the cache. This method will, asynchronously, load
* the specified objects into the cache using the associated cache loader. If the an object already exists in the
* cache, no action is taken. If no loader is associated with the object, no object will be loaded into the cache.
* If a problem is encountered during the retrieving or loading of the objects, an exception (to be defined)
* should be logged. The getAll method will return, from the cache, a Map of the objects associated with the
* Collection of keys in argument "keys". If the objects are not in the cache, the associated cache loader will be
* called. If no loader is associated with an object, a null is returned. If a problem is encountered during the
* retrieving or loading of the objects, an exception (to be defined) will be thrown. If the "arg" argument is set,
* the arg object will be passed to the CacheLoader.loadAll method. The cache will not dereference the object.
* If no "arg" value is provided a null will be passed to the loadAll method.
* <p/>
* keys - collection of the keys whose associated values to be loaded into this cache by using the associated
* cacheloader if this cache doesn't contain them.
* <p/>
* The Ehcache native API provides similar functionality to loaders using the
* decorator {@link net.sf.ehcache.constructs.blocking.SelfPopulatingCache}
*/
public void loadAll(final Collection keys, final Object argument) throws CacheException {
cache.loadAll(keys, argument);
}
/**
* The peek method will return the object associated with "key" if it currently exists (and is valid) in the cache.
* If not, a null is returned. With "peek" the CacheLoader will not be invoked and other caches in the system will not be searched.
* <p/>
* In ehcache peek bahaves the same way as {@link #get}
*
* @param key
* @return the value stored in the cache by key, or null if it does not exist
*/
public Object peek(Object key) {
Element element = cache.get(key);
if (element != null) {
return element.getObjectValue();
} else {
return null;
}
}
/**
* Remove a listener from the list of cache listeners
*
* @param cacheListener a JCACHE CacheListener
* @see JCacheListenerAdaptor
*/
public void removeListener(CacheListener cacheListener) {
JCacheListenerAdaptor cacheListenerAdaptor = new JCacheListenerAdaptor(cacheListener);
cache.getCacheEventNotificationService().unregisterListener(cacheListenerAdaptor);
}
/**
* Returns the number of key-value mappings in this map. If the
* map contains more than <tt>Integer.MAX_VALUE</tt> elements, returns
* <tt>Integer.MAX_VALUE</tt>.
*
* @return the number of key-value mappings in this map.
*/
public int size() {
return cache.getSize();
}
/**
* Returns <tt>true</tt> if this map contains no key-value mappings.
*
* @return <tt>true</tt> if this map contains no key-value mappings.
*/
public boolean isEmpty() {
return (size() == 0);
}
/**
* Returns <tt>true</tt> if this map contains a mapping for the specified
* key. More formally, returns <tt>true</tt> if and only if
* this map contains a mapping for a key <tt>k</tt> such that
* <tt>(key==null ? k==null : key.equals(k))</tt>. (There can be
* at most one such mapping.)
*
* @param key key whose presence in this map is to be tested.
* @return <tt>true</tt> if this map contains a mapping for the specified
* key.
*/
public boolean containsKey(Object key) {
return cache.isKeyInCache(key);
}
/**
* Returns <tt>true</tt> if this map maps one or more keys to the
* specified value. More formally, returns <tt>true</tt> if and only if
* this map contains at least one mapping to a value <tt>v</tt> such that
* <tt>(value==null ? v==null : value.equals(v))</tt>. This operation
* will probably require time linear in the map size for most
* implementations of the <tt>Map</tt> interface.
* <p/>
* Warning: This method is extremely slow. Ehcache is designed for efficient
* retrieval using keys, not values.
*
* @param value value whose presence in this map is to be tested.
* @return <tt>true</tt> if this map maps one or more keys to the
* specified value.
*/
public boolean containsValue(Object value) {
long start = System.currentTimeMillis();
boolean inCache = cache.isValueInCache(value);
long end = System.currentTimeMillis();
if (LOG.isLoggable(Level.WARNING)) {
LOG.warning("Performance Warning: containsValue is not recommended. This call took "
+ (end - start) + " ms");
}
return inCache;
}
/**
* The get method will return, from the cache, the object associated with
* the argument "key".
* <p/>
* If the object is not in the cache, the associated
* cache loader will be called. If no loader is associated with the object,
* a null is returned.
* <p/>
* If a problem is encountered during the retrieving
* or loading of the object, an exception (to be defined) will be thrown. (Until it is
* defined, the ehcache implementation throws a RuntimeException.)
* <p/>
* If the "arg" argument is set, the arg object will be passed to the
* CacheLoader.load method. The cache will not dereference the object.
* If no "arg" value is provided a null will be passed to the load method.
* <p/>
* The storing of null values in the cache is permitted, however, the get
* method will not distinguish returning a null stored in the cache and
* not finding the object in the cache. In both cases a null is returned.
* <p/>
* Cache statistics are only updated for the initial attempt to get the cached entry.
*
* @param key key whose associated value is to be returned.
* @return the value to which this map maps the specified key, or
* <tt>null</tt> if the map contains no mapping for this key after an attempt has been
* made to load it.
* @throws RuntimeException JSR107 should really throw a CacheException here, but the
* spec does not allow it. Instead throw a RuntimeException if the underlying load method
* throws a CacheException.
* @see #containsKey(Object)
*/
public Object get(Object key) throws RuntimeException {
return get(key, null);
}
/**
* Same as {@link #get(Object)} except a CacheLoader argument is provided.
*
* @param key key whose associated value is to be returned.
* @param loaderArgument anything at all that a CacheLoader might find useful to load
* the entry. If the loaderArgument is null, this method is the same as {@link #get(Object)}
* @return the value to which this map maps the specified key, or
* <tt>null</tt> if the map contains no mapping for this key after an attempt has been
* made to load it.
* @throws RuntimeException JSR107 should really throw a CacheException here, but the
* spec does not allow it. Instead throw a RuntimeException if the underlying load method
* throws a CacheException.
*/
public Object get(Object key, Object loaderArgument) throws RuntimeException {
return get(key, null, loaderArgument);
}
/**
* The get method will return, from the cache, the object associated with
* the argument "key".
* <p/>
* If the object is not in the cache, the associated
* cache loader will be called. If no loader is associated with the object,
* a null is returned.
* <p/>
* If a problem is encountered during the retrieving
* or loading of the object, an exception (to be defined) will be thrown. (Until it is
* defined, the ehcache implementation throws a RuntimeException.)
* <p/>
* If the "argument" argument is set, the arg object will be passed to the
* CacheLoader.load method. The cache will not dereference the object.
* If no "argument" value is provided a null will be passed to the load method.
* <p/>
* The storing of null values in the cache is permitted, however, the get
* method will not distinguish returning a null stored in the cache and
* not finding the object in the cache. In both cases a null is returned.
* <p/>
* Cache statistics are only updated for the initial attempt to get the cached entry.
*
* @param key key whose associated value is to be returned.
* @param loader A specific CacheLoader to use in place of the default one.
* @return the value to which this map maps the specified key, or
* <tt>null</tt> if the map contains no mapping for this key after an attempt has been
* made to load it.
* @throws RuntimeException JSR107 should really throw a CacheException here, but the
* spec does not allow it. Instead throw a RuntimeException if the underlying load method
* throws a CacheException.
* @see #containsKey(Object)
*/
public Object get(Object key, CacheLoader loader) throws RuntimeException {
return get(key, loader, null);
}
/**
* The get method will return, from the cache, the object associated with
* the argument "key".
* <p/>
* If the object is not in the cache, the associated
* cache loader will be called. If no loader is associated with the object,
* a null is returned.
* <p/>
* If a problem is encountered during the retrieving
* or loading of the object, an exception (to be defined) will be thrown. (Until it is
* defined, the ehcache implementation throws a RuntimeException.)
* <p/>
* If the "loaderArgument" argument is set, it will be passed to the
* CacheLoader.load method. The cache will not dereference the object.
* If no "loaderArgument" value is provided a null will be passed to the load method.
* <p/>
* The storing of null values in the cache is permitted, however, the get
* method will not distinguish returning a null stored in the cache and
* not finding the object in the cache. In both cases a null is returned.
* <p/>
* Cache statistics are only updated for the initial attempt to get the cached entry.
*
* @param key key whose associated value is to be returned.
* @param loader A specific CacheLoader to use in place of the default one.
* @param loaderArgument an Object with acts as a loaderArgument. It can contain anything that makes sense to the loader.
* @return the value to which this map maps the specified key, or
* <tt>null</tt> if the map contains no mapping for this key after an attempt has been
* made to load it.
* @throws RuntimeException JSR107 should really throw a CacheException here, but the
* spec does not allow it. Instead throw a RuntimeException if the underlying load method
* throws a CacheException.
* @see #containsKey(Object)
*/
public Object get(Object key, CacheLoader loader, Object loaderArgument) throws RuntimeException {
Element element = cache.getWithLoader(key, loader, loaderArgument);
if (element == null) {
return null;
} else {
return element.getObjectValue();
}
}
/**
* Associates the specified value with the specified key in this map
* (optional operation). If the map previously contained a mapping for
* this key, the old value is replaced by the specified value. (A map
* <tt>m</tt> is said to contain a mapping for a key <tt>k</tt> if and only
* if {@link #containsKey(Object) m.containsKey(k)} would return
* <tt>true</tt>.))
*
* @param key key with which the specified value is to be associated.
* @param value value to be associated with the specified key.
* @return previous value associated with specified key, or <tt>null</tt>
* if there was no mapping for key. A <tt>null</tt> return can
* also indicate that the map previously associated <tt>null</tt>
* with the specified key, if the implementation supports
* <tt>null</tt> values.
*/
public Object put(Object key, Object value) {
return put(key, value, 0);
}
/**
* Associates the specified value with the specified key in this map
* (optional operation). If the map previously contained a mapping for
* this key, the old value is replaced by the specified value. (A map
* <tt>m</tt> is said to contain a mapping for a key <tt>k</tt> if and only
* if {@link #containsKey(Object) m.containsKey(k)} would return
* <tt>true</tt>.))
*
* @param key key with which the specified value is to be associated.
* @param value value to be associated with the specified key.
* @param timeToLiveSeconds the time this entry will live, overriding the default. If timeToLive
* is set to 0, the default will be applied.
* @return previous value associated with specified key, or <tt>null</tt>
* if there was no mapping for key. A <tt>null</tt> return can
* also indicate that the map previously associated <tt>null</tt>
* with the specified key, if the implementation supports
* <tt>null</tt> values.
*/
public Object put(Object key, Object value, int timeToLiveSeconds) {
Element element = null;
if (cache.isKeyInCache(key)) {
element = cache.getQuiet(key);
}
Element newElement = new Element(key, value);
if (timeToLiveSeconds != 0) {
newElement.setTimeToLive(timeToLiveSeconds);
}
cache.put(newElement);
if (element != null) {
return element.getObjectValue();
} else {
return null;
}
}
/**
* Removes the mapping for this key from this map if it is present
* (optional operation). More formally, if this map contains a mapping
* from key <tt>k</tt> to value <tt>v</tt> such that
* <code>(key==null ? k==null : key.equals(k))</code>, that mapping
* is removed. (The map can contain at most one such mapping.)
* <p/>
* <p>Returns the value to which the map previously associated the key, or
* <tt>null</tt> if the map contained no mapping for this key. (A
* <tt>null</tt> return can also indicate that the map previously
* associated <tt>null</tt> with the specified key if the implementation
* supports <tt>null</tt> values.) The map will not contain a mapping for
* the specified key once the call returns.
*
* @param key key whose mapping is to be removed from the map.
* @return previous value associated with specified key, or <tt>null</tt>
* if there was no mapping for key.
*/
public Object remove(Object key) {
Element element = cache.get(key);
cache.remove(key);
if (element != null) {
return element.getObjectValue();
} else {
return null;
}
}
/**
* Copies all of the mappings from the specified map to this map
* (optional operation). The effect of this call is equivalent to that
* of calling {@link #put(Object,Object) put(k, v)} on this map once
* for each mapping from key <tt>k</tt> to value <tt>v</tt> in the
* N specified map. The behavior of this operation is unspecified if the
* specified map is modified while the operation is in progress.
*
* @param sourceMap Mappings to be stored in this map.
*/
public void putAll(Map sourceMap) {
if (sourceMap == null) {
return;
}
for (Iterator iterator = sourceMap.keySet().iterator(); iterator.hasNext();) {
Object key = iterator.next();
cache.put(new Element(key, sourceMap.get(key)));
}
}
/**
* Removes all mappings from this map (optional operation).
*/
public void clear() {
cache.removeAll();
}
/**
* Returns a set view of the keys contained in this map. The set is
* not live because ehcache is not backed by a simple map.
*
* @return a set view of the keys contained in this map.
*/
public Set keySet() {
List list = cache.getKeys();
Set set = new HashSet();
set.addAll(list);
return set;
}
/**
* Returns a collection view of the values contained in this map. The
* collection is backed by the map, so changes to the map are reflected in
* the collection, and vice-versa. If the map is modified while an
* iteration over the collection is in progress (except through the
* iterator's own <tt>remove</tt> operation), the results of the
* iteration are undefined. The collection supports element removal,
* which removes the corresponding mapping from the map, via the
* <tt>Iterator.remove</tt>, <tt>Collection.remove</tt>,
* <tt>removeAll</tt>, <tt>retainAll</tt> and <tt>clear</tt> operations.
* It does not support the add or <tt>addAll</tt> operations.
* <p/>
* Contradicting the above Map contract, whether cache changes after this method returns are not
* reflected in the Collection. This is because ehcache is not backed by a single map.
*
* @return a collection view of the values contained in this map.
*/
public Collection values() {
List list = cache.getKeysNoDuplicateCheck();
Set set = new HashSet(list.size());
for (int i = 0; i < list.size(); i++) {
Object key = list.get(i);
Element element = cache.get(key);
if (element != null) {
set.add(element.getObjectValue());
}
}
return set;
}
/**
* Returns a set view of the mappings contained in this map. Each element
* in the returned set is a {@link java.util.Map.Entry}. The set is backed by the
* map, so changes to the map are reflected in the set, and vice-versa.
* If the map is modified while an iteration over the set is in progress
* (except through the iterator's own <tt>remove</tt> operation, or through
* the <tt>setValue</tt> operation on a map entry returned by the iterator)
* the results of the iteration are undefined. The set supports element
* removal, which removes the corresponding mapping from the map, via the
* <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, <tt>removeAll</tt>,
* <tt>retainAll</tt> and <tt>clear</tt> operations. It does not support
* the <tt>add</tt> or <tt>addAll</tt> operations.
* <p/>
* Contradicting the above Map contract, whether or not changes to an entry affect the entry in the cache is undefined.
*
* @return a set view of the mappings contained in this map.
*/
public Set entrySet() {
List list = cache.getKeysNoDuplicateCheck();
Set set = new HashSet(list.size());
for (int i = 0; i < list.size(); i++) {
Object key = list.get(i);
Element element = cache.get(key);
if (element != null) {
set.add(new net.sf.ehcache.jcache.JCacheEntry(element));
}
}
return set;
}
/**
* Sets the statistics accuracy.
*
* @param statisticsAccuracy one of {@link CacheStatistics#STATISTICS_ACCURACY_BEST_EFFORT}, {@link CacheStatistics#STATISTICS_ACCURACY_GUARANTEED}, {@link CacheStatistics#STATISTICS_ACCURACY_NONE}
*/
public void setStatisticsAccuracy(int statisticsAccuracy) {
cache.setStatisticsAccuracy(statisticsAccuracy);
}
/**
* Gets the backing Ehcache
*/
public Ehcache getBackingCache() {
return cache;
}
/**
* Returns a {@link String} representation of the underlying {@link net.sf.ehcache.Cache}.
*
* @return a string representation of the object.
*/
public String toString() {
return cache.toString();
}
}
The table below shows all metrics for JCache.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 56.00 | Number of blocks | |
| BLOCK_COMMENT | 0.00 | Number of block comment lines | |
| COMMENTS | 510.00 | Comment lines | |
| COMMENT_DENSITY | 3.42 | Comment density | |
| COMPARISONS | 17.00 | Number of comparison operators | |
| CYCLOMATIC | 51.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 38.00 | Comments in declarations | |
| DOC_COMMENT | 510.00 | Number of javadoc comment lines | |
| ELOC | 149.00 | Effective lines of code | |
| EXEC_COMMENTS | 0.00 | Comments in executable code | |
| EXITS | 45.00 | Procedure exits | |
| FUNCTIONS | 35.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 44.33 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 113.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 1.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 0.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 0.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 3.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 2.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 0.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 5.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 5.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 1.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 1.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 9.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 0.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 2.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 0.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 1.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 770.00 | Number of lines in the source file | |
| LINE_COMMENT | 0.00 | Number of line comments | |
| LOC | 201.00 | Lines of code | |
| LOGICAL_LINES | 97.00 | Number of statements | |
| LOOPS | 3.00 | Number of loops | |
| NEST_DEPTH | 3.00 | Maximum nesting depth | |
| OPERANDS | 472.00 | Number of operands | |
| OPERATORS | 844.00 | Number of operators | |
| PARAMS | 35.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 1316.00 | Halstead program length | |
| PROGRAM_VOCAB | 215.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 78.00 | Number of return points from functions | |
| SIZE | 36084.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 181.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 34.00 | Number of unique operators | |
| WHITESPACE | 59.00 | Number of whitespace lines | |