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| <h2 title="Enum LockModeType" class="title">Enum LockModeType</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>java.lang.Enum<<a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a>></li> |
| <li> |
| <ul class="inheritance"> |
| <li>javax.persistence.LockModeType</li> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable, java.lang.Comparable<<a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a>></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public enum <span class="typeNameLabel">LockModeType</span> |
| extends java.lang.Enum<<a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a>></pre> |
| <div class="block">Lock modes can be specified by means of passing a <code>LockModeType</code> |
| argument to one of the <a href="../../javax/persistence/EntityManager.html" title="interface in javax.persistence"><code>EntityManager</code></a> methods that take locks |
| (<code>lock</code>, <code>find</code>, or <code>refresh</code>) or |
| to the <a href="../../javax/persistence/Query.html#setLockMode-javax.persistence.LockModeType-"><code>Query.setLockMode()</code></a> or |
| <a href="../../javax/persistence/TypedQuery.html#setLockMode-javax.persistence.LockModeType-"><code>TypedQuery.setLockMode()</code></a> method. |
| |
| <p> Lock modes can be used to specify either optimistic or pessimistic locks. |
| |
| <p> Optimistic locks are specified using <a href="../../javax/persistence/LockModeType.html#OPTIMISTIC"><code>LockModeType.OPTIMISTIC</code></a> and <a href="../../javax/persistence/LockModeType.html#OPTIMISTIC_FORCE_INCREMENT"><code>LockModeType.OPTIMISTIC_FORCE_INCREMENT</code></a>. The lock mode type |
| values <a href="../../javax/persistence/LockModeType.html#READ"><code>LockModeType.READ</code></a> and |
| <a href="../../javax/persistence/LockModeType.html#WRITE"><code>LockModeType.WRITE</code></a> are |
| synonyms of <code>OPTIMISTIC</code> and |
| <code>OPTIMISTIC_FORCE_INCREMENT</code> respectively. The latter |
| are to be preferred for new applications. |
| |
| <p> The semantics of requesting locks of type |
| <code>LockModeType.OPTIMISTIC</code> and |
| <code>LockModeType.OPTIMISTIC_FORCE_INCREMENT</code> are the |
| following. |
| |
| <p> If transaction T1 calls for a lock of type |
| <code>LockModeType.OPTIMISTIC</code> on a versioned object, |
| the entity manager must ensure that neither of the following |
| phenomena can occur: |
| <ul> |
| <li> P1 (Dirty read): Transaction T1 modifies a row. |
| Another transaction T2 then reads that row and obtains |
| the modified value, before T1 has committed or rolled back. |
| Transaction T2 eventually commits successfully; it does not |
| matter whether T1 commits or rolls back and whether it does |
| so before or after T2 commits. |
| </li> |
| <li> P2 (Non-repeatable read): Transaction T1 reads a row. |
| Another transaction T2 then modifies or deletes that row, |
| before T1 has committed. Both transactions eventually commit |
| successfully. |
| </li> |
| </ul> |
| |
| <p> Lock modes must always prevent the phenomena P1 and P2. |
| |
| <p> In addition, calling a lock of type |
| <code>LockModeType.OPTIMISTIC_FORCE_INCREMENT</code> on a versioned object, |
| will also force an update (increment) to the entity's version |
| column. |
| |
| <p> The persistence implementation is not required to support |
| the use of optimistic lock modes on non-versioned objects. When it |
| cannot support a such lock call, it must throw the <a href="../../javax/persistence/PersistenceException.html" title="class in javax.persistence"><code>PersistenceException</code></a>. |
| |
| <p>The lock modes <a href="../../javax/persistence/LockModeType.html#PESSIMISTIC_READ"><code>LockModeType.PESSIMISTIC_READ</code></a>, <a href="../../javax/persistence/LockModeType.html#PESSIMISTIC_WRITE"><code>LockModeType.PESSIMISTIC_WRITE</code></a>, and |
| <a href="../../javax/persistence/LockModeType.html#PESSIMISTIC_FORCE_INCREMENT"><code>LockModeType.PESSIMISTIC_FORCE_INCREMENT</code></a> are used to immediately |
| obtain long-term database locks. |
| |
| <p> The semantics of requesting locks of type |
| <code>LockModeType.PESSIMISTIC_READ</code>, <code>LockModeType.PESSIMISTIC_WRITE</code>, and |
| <code>LockModeType.PESSIMISTIC_FORCE_INCREMENT</code> are the following. |
| |
| <p> If transaction T1 calls for a lock of type |
| <code>LockModeType.PESSIMISTIC_READ</code> or |
| <code>LockModeType.PESSIMISTIC_WRITE</code> on an object, the entity |
| manager must ensure that neither of the following phenomena can |
| occur: |
| <ul> |
| <li> P1 (Dirty read): Transaction T1 modifies a |
| row. Another transaction T2 then reads that row and obtains the |
| modified value, before T1 has committed or rolled back. |
| |
| <li> P2 (Non-repeatable read): Transaction T1 reads a row. Another |
| transaction T2 then modifies or deletes that row, before T1 has |
| committed or rolled back. |
| </ul> |
| |
| <p> A lock with <code>LockModeType.PESSIMISTIC_WRITE</code> can be obtained on |
| an entity instance to force serialization among transactions |
| attempting to update the entity data. A lock with |
| <code>LockModeType.PESSIMISTIC_READ</code> can be used to query data using |
| repeatable-read semantics without the need to reread the data at |
| the end of the transaction to obtain a lock, and without blocking |
| other transactions reading the data. A lock with |
| <code>LockModeType.PESSIMISTIC_WRITE</code> can be used when querying data and |
| there is a high likelihood of deadlock or update failure among |
| concurrent updating transactions. |
| |
| <p> The persistence implementation must support use of locks of type |
| <code>LockModeType.PESSIMISTIC_READ</code> |
| <code>LockModeType.PESSIMISTIC_WRITE</code> on a non-versioned entity as well as |
| on a versioned entity. |
| |
| <p> When the lock cannot be obtained, and the database locking |
| failure results in transaction-level rollback, the provider must |
| throw the <a href="../../javax/persistence/PessimisticLockException.html" title="class in javax.persistence"><code>PessimisticLockException</code></a> and ensure that the JTA |
| transaction or <code>EntityTransaction</code> has been marked for rollback. |
| |
| <p> When the lock cannot be obtained, and the database locking |
| failure results in only statement-level rollback, the provider must |
| throw the <a href="../../javax/persistence/LockTimeoutException.html" title="class in javax.persistence"><code>LockTimeoutException</code></a> (and must not mark the transaction |
| for rollback).</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 1.0</dd> |
| </dl> |
| </li> |
| </ul> |
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| <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="../../javax/persistence/LockModeType.html#NONE">NONE</a></span></code> |
| <div class="block">No lock.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#OPTIMISTIC">OPTIMISTIC</a></span></code> |
| <div class="block">Optimistic lock.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#OPTIMISTIC_FORCE_INCREMENT">OPTIMISTIC_FORCE_INCREMENT</a></span></code> |
| <div class="block">Optimistic lock, with version update.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#PESSIMISTIC_FORCE_INCREMENT">PESSIMISTIC_FORCE_INCREMENT</a></span></code> |
| <div class="block">Pessimistic write lock, with version update.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#PESSIMISTIC_READ">PESSIMISTIC_READ</a></span></code> |
| <div class="block">Pessimistic read lock.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#PESSIMISTIC_WRITE">PESSIMISTIC_WRITE</a></span></code> |
| <div class="block">Pessimistic write lock.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#READ">READ</a></span></code> |
| <div class="block">Synonymous with <code>OPTIMISTIC</code>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#WRITE">WRITE</a></span></code> |
| <div class="block">Synonymous with <code>OPTIMISTIC_FORCE_INCREMENT</code>.</div> |
| </td> |
| </tr> |
| </table> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <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="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.html#valueOf-java.lang.String-">valueOf</a></span>(java.lang.String 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="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/LockModeType.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> |
| </td> |
| </tr> |
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| <a name="READ"> |
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| <li class="blockList"> |
| <h4>READ</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> READ</pre> |
| <div class="block">Synonymous with <code>OPTIMISTIC</code>. |
| <code>OPTIMISTIC</code> is to be preferred for new |
| applications.</div> |
| </li> |
| </ul> |
| <a name="WRITE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>WRITE</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> WRITE</pre> |
| <div class="block">Synonymous with <code>OPTIMISTIC_FORCE_INCREMENT</code>. |
| <code>OPTIMISTIC_FORCE_IMCREMENT</code> is to be preferred for new |
| applications.</div> |
| </li> |
| </ul> |
| <a name="OPTIMISTIC"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>OPTIMISTIC</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> OPTIMISTIC</pre> |
| <div class="block">Optimistic lock.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="OPTIMISTIC_FORCE_INCREMENT"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>OPTIMISTIC_FORCE_INCREMENT</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> OPTIMISTIC_FORCE_INCREMENT</pre> |
| <div class="block">Optimistic lock, with version update.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="PESSIMISTIC_READ"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>PESSIMISTIC_READ</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> PESSIMISTIC_READ</pre> |
| <div class="block">Pessimistic read lock.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="PESSIMISTIC_WRITE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>PESSIMISTIC_WRITE</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> PESSIMISTIC_WRITE</pre> |
| <div class="block">Pessimistic write lock.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="PESSIMISTIC_FORCE_INCREMENT"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>PESSIMISTIC_FORCE_INCREMENT</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> PESSIMISTIC_FORCE_INCREMENT</pre> |
| <div class="block">Pessimistic write lock, with version update.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="NONE"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>NONE</h4> |
| <pre>public static final <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> NONE</pre> |
| <div class="block">No lock.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <a name="values--"> |
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| </a> |
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| <h4>values</h4> |
| <pre>public static <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</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 (LockModeType c : LockModeType.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> |
| </li> |
| </ul> |
| <a name="valueOf-java.lang.String-"> |
| <!-- --> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../javax/persistence/LockModeType.html" title="enum in javax.persistence">LockModeType</a> valueOf(java.lang.String 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>java.lang.IllegalArgumentException</code> - if this enum type has no constant with the specified name</dd> |
| <dd><code>java.lang.NullPointerException</code> - if the argument is null</dd> |
| </dl> |
| </li> |
| </ul> |
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