CacheEntry.java
| Index Score | ||
|---|---|---|
 |
 |
org.apache.derby.impl.services.cache |
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 |
Apache Derby |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| JAVA0034 | JAVA0034 Missing braces in if statement |  |
| DOC_COMMENT | Number of javadoc comment lines | |
| DECL_COMMENTS | Comments in declarations | |
| COMMENTS | Comment lines | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| LINE_COMMENT | Number of line comments | |
| COMPARISONS | Number of comparison operators | |
| ELOC | Effective lines of code | |
| LOGICAL_LINES | Number of statements | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| OPERATORS | Number of operators | |
| PROGRAM_LENGTH | Halstead program length | |
| LOC | Lines of code | |
| RETURNS | Number of return points from functions | |
| OPERANDS | Number of operands | |
| WHITESPACE | Number of whitespace lines | |
| EXITS | Procedure exits | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| UNIQUE_OPERANDS | Number of unique operands | |
| PARAMS | Number of formal parameter declarations | |
| CYCLOMATIC | Cyclomatic complexity | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| LOOPS | Number of loops | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
/*
Derby - Class org.apache.derby.impl.services.cache.CacheEntry
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to you 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 org.apache.derby.impl.services.cache;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.derby.iapi.services.cache.Cacheable;
import org.apache.derby.iapi.services.sanity.SanityManager;
/**
* Class representing an entry in the cache. It is used by
* <code>ConcurrentCache</code>. When a thread invokes any of the methods in
* this class, except <code>lock()</code>, it must first have called
* <code>lock()</code> to ensure exclusive access to the entry.
*
* <p>
*
* When no thread holds the lock on the entry, it must be in one of the
* following states:
*
* <dl>
*
* <dt>Uninitialized</dt> <dd>The entry object has just been constructed, but
* has not yet been initialized. In this state, <code>isValid()</code> returns
* <code>false</code>, whereas <code>isKept()</code> returns <code>true</code>
* in order to prevent removal of the entry until it has been initialized.
* When the entry is in this state, calls to
* <code>lockWhenIdentityIsSet()</code> will block until
* <code>settingIdentityComplete()</code> has been called.</dd>
*
* <dt>Unkept</dt> <dd>In this state, the entry object contains a reference to
* a <code>Cacheable</code> and the keep count is zero. <code>isValid()</code>
* returns <code>true</code> and <code>isKept()</code> returns
* <code>false</code> in this state. <code>getCacheable()</code> returns a
* non-null value.<dd>
*
* <dt>Kept</dt> <dd>Same as the unkept state, except that the keep count is
* positive and <code>isKept()</code> returns <code>true</code>.</dd>
*
* <dt>Removed</dt> <dd>The entry has been removed from the cache. In this
* state, <code>isValid()</code> and <code>isKept()</code> return
* <code>false</code>, and <code>getCacheable()</code> returns
* <code>null</code>. When an entry has entered the removed state, it cannot be
* transitioned back to any of the other states.</dd>
*
* </dl>
*
* <p>
*
* To prevent deadlocks, each thread should normally lock only one entry at a
* time. In some cases it is legitimate to hold the lock on two entries, for
* instance if an entry must be evicted to make room for a new entry. If this
* is the case, exactly one of the two entries must be in the uninitialized
* state, and the uninitialized entry must be locked before the lock on the
* other entry can be requested.
*/
final class CacheEntry {
/** Mutex which guards the internal state of the entry. */
private final ReentrantLock mutex = new ReentrantLock();
/**
* The cached object. If it is null, it means that the entry is invalid
* (either uninitialized or removed).
*/
private Cacheable cacheable;
/** How many threads are currently keeping this entry. */
private int keepCount;
/**
* Condition variable used to notify a thread that it is allowed to remove
* the entry from the cache. If it is null, there is no thread waiting for
* the entry to be unkept.
*/
private Condition forRemove;
/**
* Condition variable used to notify a thread that the setting of this
* entry's identity is complete. This variable is non-null when the object
* is created, and will be set to null when the identity has been set.
* @see #settingIdentityComplete()
*/
private Condition settingIdentity = mutex.newCondition();
/**
* Callback object used to notify the replacement algorithm about events on
* the cached objects (like accesses and requests for removal).
*/
private ReplacementPolicy.Callback callback;
/**
* Block until the current thread is granted exclusive access to the entry.
*/
void lock() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(!mutex.isHeldByCurrentThread());
}
mutex.lock();
}
/**
* Block until this entry's cacheable has been initialized (that is, until
* {@code settingIdentityComplete()} has been called on this object). If
* the cacheable has been initialized before this method is called, it will
* return immediately. The entry must have been locked for exclusive access
* before this method is called. If the method needs to wait, it will
* release the lock and reobtain it when it wakes up again.
*/
void waitUntilIdentityIsSet() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
while (settingIdentity != null) {
settingIdentity.awaitUninterruptibly();
}
}
/**
* Give up exclusive access.
*/
void unlock() {
mutex.unlock();
}
/**
* Notify this entry that the initialization of its cacheable has been
* completed. This method should be called after
* <code>Cacheable.setIdentity()</code> or
* <code>Cacheable.createIdentity()</code> has been called.
*/
void settingIdentityComplete() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
settingIdentity.signalAll();
settingIdentity = null;
}
/**
* Increase the keep count for this entry. An entry which is kept cannot be
* removed from the cache.
*
* @param accessed if <code>true</code>, notify the entry's callback object
* that it has been accessed (normally because of calls to create, find or
* findCached); otherwise, don't notify the callback object
*/
void keep(boolean accessed) {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
keepCount++;
if (accessed) {
callback.access();
}
}
/**
* Decrement the keep count for this entry. An entry cannot be removed from
* the cache until its keep count is zero.
*/
void unkeep() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(isKept());
}
keepCount--;
if (forRemove != null && keepCount == 1) {
// This entry is only kept by the thread waiting in
// unkeepForRemove(). Signal that the entry can be removed.
forRemove.signal();
}
}
/**
* Check whether or not this entry is kept.
*
* @return <code>true</code> if the object is kept
*/
boolean isKept() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
SanityManager.ASSERT(keepCount >= 0);
}
return keepCount > 0;
}
/**
* Unkeep the entry and wait until no other thread is keeping it. This
* method is used when a thread requests the removal of the entry. As
* defined by the contract of <code>CacheManager.remove()</code>, it is the
* responsibility of the caller to ensure that only a single thread
* executes this method on an object.
*
* @see org.apache.derby.iapi.services.cache.CacheManager#remove
*/
void unkeepForRemove() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(isKept());
SanityManager.ASSERT(forRemove == null);
}
if (keepCount > 1) {
forRemove = mutex.newCondition();
while (keepCount > 1) {
forRemove.awaitUninterruptibly();
}
forRemove = null;
}
keepCount--;
}
/**
* Set the cached object held by this entry.
*
* @param c a cacheable, or <code>null</code> if the entry is about to be
* removed
*/
void setCacheable(Cacheable c) {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
cacheable = c;
}
/**
* Return the cached object held by this entry.
*
* @return the cached object in this entry
*/
Cacheable getCacheable() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
return cacheable;
}
/**
* Check whether this entry holds a valid object. That is, it must hold
* a non-null <code>Cacheable</code> and have completed setting its
* identity.
*
* @return <code>true</code> if the entry holds a valid object
*/
boolean isValid() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
return (settingIdentity == null) && (cacheable != null);
}
/**
* Set the callback object used to notify the replacement algorithm about
* actions performed on the cached object.
*
* @param cb the callback object
*/
void setCallback(ReplacementPolicy.Callback cb) {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
callback = cb;
}
/**
* Clear this entry and notify the replacement algorithm that the
* <code>Cacheable</code> can be reused.
*/
void free() {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(mutex.isHeldByCurrentThread());
}
if (callback != null) {
// The entry was inserted into the ReplacementPolicy before
// removal. Now we need to mark it as free.
callback.free();
}
cacheable = null;
}
}
The table below shows all metrics for CacheEntry.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 31.00 | Number of blocks | |
| BLOCK_COMMENT | 20.00 | Number of block comment lines | |
| COMMENTS | 166.00 | Comment lines | |
| COMMENT_DENSITY | 2.16 | Comment density | |
| COMPARISONS | 11.00 | Number of comparison operators | |
| CYCLOMATIC | 33.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 21.00 | Comments in declarations | |
| DOC_COMMENT | 142.00 | Number of javadoc comment lines | |
| ELOC | 77.00 | Effective lines of code | |
| EXEC_COMMENTS | 2.00 | Comments in executable code | |
| EXITS | 11.00 | Procedure exits | |
| FUNCTIONS | 13.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 46.75 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 16.00 | 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 | 0.00 | 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 | 0.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 0.00 | 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 | 1.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 1.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | 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 | 0.00 | 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 | 0.00 | 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 | 0.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 1.00 | 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 | 0.00 | 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 | 0.00 | 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 | 0.00 | 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 | 296.00 | Number of lines in the source file | |
| LINE_COMMENT | 4.00 | Number of line comments | |
| LOC | 109.00 | Lines of code | |
| LOGICAL_LINES | 45.00 | Number of statements | |
| LOOPS | 2.00 | Number of loops | |
| NEST_DEPTH | 3.00 | Maximum nesting depth | |
| OPERANDS | 187.00 | Number of operands | |
| OPERATORS | 406.00 | Number of operators | |
| PARAMS | 3.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 593.00 | Halstead program length | |
| PROGRAM_VOCAB | 84.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 13.00 | Number of return points from functions | |
| SIZE | 10288.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 56.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 28.00 | Number of unique operators | |
| WHITESPACE | 21.00 | Number of whitespace lines | |