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| <h2 title="Enum ReferenceMode" class="title">Enum ReferenceMode</h2> |
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| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">java.lang.Enum</a><<a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a>></li> |
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| <li>org.eclipse.persistence.config.ReferenceMode</li> |
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| <pre>public enum <span class="typeNameLabel">ReferenceMode</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a><<a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a>></pre> |
| <div class="block"><b>Purpose:</b> This class is a configuration property used to specify |
| What type of Referenes EclipseLink will use when referencing Entities |
| within the Persistence Context / UnitOfWork. Depending on the configured |
| ReferenceMode some Entities may be garbage collected.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Gordon</dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
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| <h3>Enum Constant Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Constant Summary table, listing enum constants, and an explanation"> |
| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Enum Constant and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/ReferenceMode.html#FORCE_WEAK">FORCE_WEAK</a></span></code> |
| <div class="block">Same as weak reference except Objects that can not be changed |
| tracked (Deferred Change Detection) will not be prevented from being |
| garbage collected.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/ReferenceMode.html#HARD">HARD</a></span></code> |
| <div class="block">References to Objects will be through hard references.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/ReferenceMode.html#WEAK">WEAK</a></span></code> |
| <div class="block">References to Objects that support active attribute change tracking |
| (enabled through weaving or by the developer)will be held by weak |
| references.</div> |
| </td> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/ReferenceMode.html#valueOf-java.lang.String-">valueOf</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/ReferenceMode.html#values--">values</a></span>()</code> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <h4>HARD</h4> |
| <pre>public static final <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a> HARD</pre> |
| <div class="block">References to Objects will be through hard references. These objects will not be available for |
| garbage collection until the referencing artifact (usually a Persistence Context or UnitOfWork) |
| released or closed.</div> |
| </li> |
| </ul> |
| <a name="WEAK"> |
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| <li class="blockList"> |
| <h4>WEAK</h4> |
| <pre>public static final <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a> WEAK</pre> |
| <div class="block">References to Objects that support active attribute change tracking |
| (enabled through weaving or by the developer)will be held by weak |
| references. This means any of afore mentioned objects no longer referenced directly or |
| indirectly will be available for garbage collection. If the object is |
| gc'd before the EM/UnitOfWork flushes to the database then this object |
| and any others like it will not be checked for changes. When a change is |
| made to a change tracked object that object is moved to a hard reference |
| and will not be available for GC until flushed. New and removed objects |
| are also held by hard references. Non change tracked objects will always |
| be held by "hard" references and are not available for GC. This is the |
| default mode for EclipsLink. See: |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ref/WeakReference.html?is-external=true" title="class or interface in java.lang.ref"><code>WeakReference</code></a> |
| <a href="../../../../org/eclipse/persistence/descriptors/changetracking/AttributeChangeTrackingPolicy.html" title="class in org.eclipse.persistence.descriptors.changetracking"><code>AttributeChangeTrackingPolicy</code></a></div> |
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| </ul> |
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| <!-- --> |
| </a> |
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| <h4>FORCE_WEAK</h4> |
| <pre>public static final <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a> FORCE_WEAK</pre> |
| <div class="block">Same as weak reference except Objects that can not be changed |
| tracked (Deferred Change Detection) will not be prevented from being |
| garbage collected. This may result in a loss of changes if a changed object |
| is removed before being flushed to the database. |
| When a change is made to a change tracked object that object |
| is moved to a hard reference and will not be available for GC until |
| flushed. New and removed objects are also held by hard references until |
| flush..</div> |
| </li> |
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| <a name="values--"> |
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| <h4>values</h4> |
| <pre>public static <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (ReferenceMode c : ReferenceMode.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../../../org/eclipse/persistence/config/ReferenceMode.html" title="enum in org.eclipse.persistence.config">ReferenceMode</a> valueOf(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd> |
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