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<div class="subTitle">com.amazon.carbonado.txn</div>
<h2 title="Class TransactionManager" class="title">Class TransactionManager<Txn></h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>com.amazon.carbonado.txn.TransactionManager<Txn></li>
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>Txn</code> - Transaction implementation</dd></dl>
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<br>
<pre>public abstract class <span class="strong">TransactionManager<Txn></span>
extends java.lang.Object</pre>
<div class="block">Generic transaction manager for repositories.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Brian S O'Neill</dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#TransactionManager()">TransactionManager</a></strong>()</code> </td>
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<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#TransactionManager(com.amazon.carbonado.txn.TransactionMonitor)">TransactionManager</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionMonitor.html" title="interface in com.amazon.carbonado.txn">TransactionMonitor</a> monitor)</code> </td>
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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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<td class="colFirst"><code>protected abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#abortTxn(Txn)">abortTxn</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</code>
<div class="block">Aborts and closes the given internal transaction.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#attachNotification(Txn)">attachNotification</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</code>
<div class="block">Called to notify internal method that transaction is attached.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#close(boolean)">close</a></strong>(boolean suspend)</code>
<div class="block">Closes all transaction scopes.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>protected abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#commitTxn(Txn)">commitTxn</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</code>
<div class="block">Commits and closes the given internal transaction.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>protected abstract <a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#createTxn(Txn, com.amazon.carbonado.IsolationLevel)">createTxn</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> parent,
<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> level)</code>
<div class="block">Creates an internal transaction representation, with the optional parent
transaction.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#createTxn(Txn, com.amazon.carbonado.IsolationLevel, int, java.util.concurrent.TimeUnit)">createTxn</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> parent,
<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> level,
int timeout,
java.util.concurrent.TimeUnit unit)</code>
<div class="block">Creates an internal transaction representation, with the optional parent
transaction.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../com/amazon/carbonado/txn/TransactionScope.html" title="class in com.amazon.carbonado.txn">TransactionScope</a><<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#detachLocalScope()">detachLocalScope</a></strong>()</code>
<div class="block">Detaches the thread-local TransactionScope from the current thread.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#detachNotification(Txn)">detachNotification</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</code>
<div class="block">Called to notify internal method that transaction is detached.</div>
</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#isClosed()">isClosed</a></strong>()</code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../com/amazon/carbonado/txn/TransactionScope.html" title="class in com.amazon.carbonado.txn">TransactionScope</a><<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#localScope()">localScope</a></strong>()</code>
<div class="block">Returns the thread-local TransactionScope, creating it if needed.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#reuseTxn(Txn)">reuseTxn</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</code>
<div class="block">Called when a transaction is about to be reused.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>protected abstract <a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#selectIsolationLevel(com.amazon.carbonado.Transaction, com.amazon.carbonado.IsolationLevel)">selectIsolationLevel</a></strong>(<a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a> parent,
<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> level)</code>
<div class="block">Returns supported isolation level, which may be higher.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#setForUpdate(Txn, boolean)">setForUpdate</a></strong>(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn,
boolean forUpdate)</code>
<div class="block">Called when the Transaction.setForUpdate method is called.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionManager.html#supportsForUpdate()">supportsForUpdate</a></strong>()</code>
<div class="block">Return true if transactions support "for update" mode.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h3>Constructor Detail</h3>
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<h4>TransactionManager</h4>
<pre>public TransactionManager()</pre>
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<h4>TransactionManager</h4>
<pre>public TransactionManager(<a href="../../../../com/amazon/carbonado/txn/TransactionMonitor.html" title="interface in com.amazon.carbonado.txn">TransactionMonitor</a> monitor)</pre>
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<h4>localScope</h4>
<pre>public <a href="../../../../com/amazon/carbonado/txn/TransactionScope.html" title="class in com.amazon.carbonado.txn">TransactionScope</a><<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a>> localScope()</pre>
<div class="block">Returns the thread-local TransactionScope, creating it if needed.</div>
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<h4>detachLocalScope</h4>
<pre>public <a href="../../../../com/amazon/carbonado/txn/TransactionScope.html" title="class in com.amazon.carbonado.txn">TransactionScope</a><<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a>> detachLocalScope()</pre>
<div class="block">Detaches the thread-local TransactionScope from the current thread. It
can be <a href="../../../../com/amazon/carbonado/txn/TransactionScope.html#attach()"><code>attached</code></a> later, and to any thread
which does not currently have a TransactionScope.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>detached thread-local TransactionScope or null if none</dd><dt><span class="strong">Since:</span></dt>
<dd>1.2</dd></dl>
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<h4>close</h4>
<pre>public void close(boolean suspend)
throws <a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></pre>
<div class="block">Closes all transaction scopes. Should be called only when repository is
closed.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>suspend</code> - when true, indefinitely suspend all threads interacting
with transactions</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></code></dd></dl>
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<h4>isClosed</h4>
<pre>public boolean isClosed()</pre>
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<h4>selectIsolationLevel</h4>
<pre>protected abstract <a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> selectIsolationLevel(<a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a> parent,
<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> level)</pre>
<div class="block">Returns supported isolation level, which may be higher. If isolation
level cannot go higher (or lower than parent) then return null.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>parent</code> - optional parent transaction</dd><dd><code>level</code> - desired isolation level (may be null)</dd></dl>
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<h4>supportsForUpdate</h4>
<pre>protected abstract boolean supportsForUpdate()</pre>
<div class="block">Return true if transactions support "for update" mode.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.2</dd></dl>
</li>
</ul>
<a name="createTxn(java.lang.Object,com.amazon.carbonado.IsolationLevel)">
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<h4>createTxn</h4>
<pre>protected abstract <a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> createTxn(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> parent,
<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> level)
throws java.lang.Exception</pre>
<div class="block">Creates an internal transaction representation, with the optional parent
transaction. If parent is not null and real nested transactions are not
supported, simply return parent transaction for supporting fake nested
transactions.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>parent</code> - optional parent transaction</dd><dd><code>level</code> - required isolation level</dd>
<dt><span class="strong">Returns:</span></dt><dd>new transaction, parent transaction, or possibly null if required
isolation level is none</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd></dl>
</li>
</ul>
<a name="createTxn(java.lang.Object,com.amazon.carbonado.IsolationLevel,int,java.util.concurrent.TimeUnit)">
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<h4>createTxn</h4>
<pre>protected <a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> createTxn(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> parent,
<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a> level,
int timeout,
java.util.concurrent.TimeUnit unit)
throws java.lang.Exception</pre>
<div class="block">Creates an internal transaction representation, with the optional parent
transaction. If parent is not null and real nested transactions are not
supported, simply return parent transaction for supporting fake nested
transactions.
<p>The default implementation of this method just calls the regular
createTxn method, ignoring the timeout parameter.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>parent</code> - optional parent transaction</dd><dd><code>level</code> - required isolation level</dd><dd><code>timeout</code> - desired timeout for lock acquisition, never negative</dd><dd><code>unit</code> - timeout unit, never null</dd>
<dt><span class="strong">Returns:</span></dt><dd>new transaction, parent transaction, or possibly null if required
isolation level is none</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd></dl>
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</ul>
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<h4>reuseTxn</h4>
<pre>protected void reuseTxn(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)
throws java.lang.Exception</pre>
<div class="block">Called when a transaction is about to be reused. The default
implementation of this method does nothing. Override if any preparation
is required to ready a transaction for reuse.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - transaction to reuse, never null</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd><dt><span class="strong">Since:</span></dt>
<dd>1.1.3</dd></dl>
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<h4>setForUpdate</h4>
<pre>protected void setForUpdate(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn,
boolean forUpdate)</pre>
<div class="block">Called when the Transaction.setForUpdate method is called. The default
implementation of this method does nothing. Override if internal
transaction needs to switch modes.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.2.1</dd></dl>
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<h4>attachNotification</h4>
<pre>protected void attachNotification(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</pre>
<div class="block">Called to notify internal method that transaction is attached.
The default implementation of this method does nothing. Override if
using remote transactions.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - transaction that is attached, could be null if none exists</dd><dt><span class="strong">Since:</span></dt>
<dd>1.2.2</dd></dl>
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<h4>detachNotification</h4>
<pre>protected void detachNotification(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)</pre>
<div class="block">Called to notify internal method that transaction is detached.
The default implementation of this method does nothing. Override if
using remote transactions.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - transaction that is dettached, could be null if none exists</dd><dt><span class="strong">Since:</span></dt>
<dd>1.2.2</dd></dl>
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<pre>protected abstract boolean commitTxn(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)
throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block">Commits and closes the given internal transaction.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if transaction object is still valid</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></dd></dl>
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<pre>protected abstract void abortTxn(<a href="../../../../com/amazon/carbonado/txn/TransactionManager.html" title="type parameter in TransactionManager">Txn</a> txn)
throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block">Aborts and closes the given internal transaction.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></dd></dl>
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