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<div class="subTitle">com.amazon.carbonado.txn</div>
<h2 title="Class TransactionPair" class="title">Class TransactionPair</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="strong">TransactionPair</span>
extends java.lang.Object
implements <a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></pre>
<div class="block">Pairs two transaction together into one. The transaction cannot be atomic,
 however. Inconsistencies can result if the primary transaction succeeds in
 committing, but the secondary fails. Therefore, the designated primary
 transaction should be the one that is more likely to fail. For example, the
 primary transaction might rely on the network, but the secondary operates
 locally.</div>
<dl><dt><span class="strong">Author:</span></dt>
  <dd>Don Schneider, 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/TransactionPair.html#TransactionPair(com.amazon.carbonado.Transaction, com.amazon.carbonado.Transaction)">TransactionPair</a></strong>(<a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a>&nbsp;primaryTransaction,
               <a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a>&nbsp;secondaryTransaction)</code>&nbsp;</td>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#attach()">attach</a></strong>()</code>
<div class="block">Attaches this transaction to the current thread, if it has been
 detached.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#commit()">commit</a></strong>()</code>
<div class="block">If currently in a transaction, commits all changes to the storage layer
 since the last commit within the transaction.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#detach()">detach</a></strong>()</code>
<div class="block">Detaches this transaction from the current thread.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#exit()">exit</a></strong>()</code>
<div class="block">Closes the current transaction, aborting all changes since the last
 commit.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><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/TransactionPair.html#getIsolationLevel()">getIsolationLevel</a></strong>()</code>
<div class="block">Returns the isolation level of this transaction.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#isForUpdate()">isForUpdate</a></strong>()</code>
<div class="block">Returns true if this transaction is in update mode, which is adjusted by
 calling <a href="../../../../com/amazon/carbonado/Transaction.html#setForUpdate(boolean)"><code>Transaction.setForUpdate(boolean)</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#preCommit()">preCommit</a></strong>()</code>
<div class="block">Calling this method commits all nested child transactions, closes all
 scoped cursors, and locks out some interactions from other threads.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#setDesiredLockTimeout(int, java.util.concurrent.TimeUnit)">setDesiredLockTimeout</a></strong>(int&nbsp;timeout,
                     java.util.concurrent.TimeUnit&nbsp;unit)</code>
<div class="block">Specify a desired timeout for aquiring locks within this
 transaction.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/txn/TransactionPair.html#setForUpdate(boolean)">setForUpdate</a></strong>(boolean&nbsp;forUpdate)</code>
<div class="block">Set to true to force all read operations within this transaction to
 acquire upgradable or write locks.</div>
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<h4>TransactionPair</h4>
<pre>public&nbsp;TransactionPair(<a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a>&nbsp;primaryTransaction,
               <a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a>&nbsp;secondaryTransaction)</pre>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>primaryTransaction</code> - is committed first, exited last</dd><dd><code>secondaryTransaction</code> - is exited first, commited last</dd></dl>
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<h4>commit</h4>
<pre>public&nbsp;void&nbsp;commit()
            throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#commit()">Transaction</a></code></strong></div>
<div class="block">If currently in a transaction, commits all changes to the storage layer
 since the last commit within the transaction.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#commit()">commit</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></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> - if storage layer throws an exception</dd></dl>
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<h4>exit</h4>
<pre>public&nbsp;void&nbsp;exit()
          throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#exit()">Transaction</a></code></strong></div>
<div class="block">Closes the current transaction, aborting all changes since the last
 commit.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#exit()">exit</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></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> - if storage layer throws an exception</dd></dl>
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<h4>setForUpdate</h4>
<pre>public&nbsp;void&nbsp;setForUpdate(boolean&nbsp;forUpdate)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#setForUpdate(boolean)">Transaction</a></code></strong></div>
<div class="block">Set to true to force all read operations within this transaction to
 acquire upgradable or write locks. This option eliminates deadlocks that
 may occur when updating records, except it may increase contention.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#setForUpdate(boolean)">setForUpdate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
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<h4>isForUpdate</h4>
<pre>public&nbsp;boolean&nbsp;isForUpdate()</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#isForUpdate()">Transaction</a></code></strong></div>
<div class="block">Returns true if this transaction is in update mode, which is adjusted by
 calling <a href="../../../../com/amazon/carbonado/Transaction.html#setForUpdate(boolean)"><code>Transaction.setForUpdate(boolean)</code></a>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#isForUpdate()">isForUpdate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
</dl>
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<h4>setDesiredLockTimeout</h4>
<pre>public&nbsp;void&nbsp;setDesiredLockTimeout(int&nbsp;timeout,
                         java.util.concurrent.TimeUnit&nbsp;unit)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#setDesiredLockTimeout(int, java.util.concurrent.TimeUnit)">Transaction</a></code></strong></div>
<div class="block">Specify a desired timeout for aquiring locks within this
 transaction. Calling this method may have have no effect at all, if the
 repository does not support this feature. In addition, the lock timeout
 might not be alterable if the transaction contains uncommitted data.

 <p>Also, the range of lock timeout values supported might be small. For
 example, only a timeout value of zero might be supported. In that case,
 the transaction is configured to not wait at all when trying to acquire
 locks. Expect immediate timeout exceptions when locks cannot be
 granted.

 <p>Nested transactions inherit the desired lock timeout of their
 parent. Top transactions always begin with the default lock timeout.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#setDesiredLockTimeout(int, java.util.concurrent.TimeUnit)">setDesiredLockTimeout</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>timeout</code> - Desired lock timeout. If negative, revert lock timeout to
 default value.</dd><dd><code>unit</code> - Time unit for timeout. If null, revert lock timeout to
 default value.</dd></dl>
</li>
</ul>
<a name="getIsolationLevel()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getIsolationLevel</h4>
<pre>public&nbsp;<a href="../../../../com/amazon/carbonado/IsolationLevel.html" title="enum in com.amazon.carbonado">IsolationLevel</a>&nbsp;getIsolationLevel()</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#getIsolationLevel()">Transaction</a></code></strong></div>
<div class="block">Returns the isolation level of this transaction.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#getIsolationLevel()">getIsolationLevel</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
</dl>
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<h4>detach</h4>
<pre>public&nbsp;void&nbsp;detach()</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#detach()">Transaction</a></code></strong></div>
<div class="block">Detaches this transaction from the current thread. It can be attached
 later, and to any thread which currently has no thread-local
 transaction.

 <p>Detaching a transaction also detaches any parent and nested child
 transactions. Attaching any of them achieves the same result as
 attaching this transaction.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#detach()">detach</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
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<h4>attach</h4>
<pre>public&nbsp;void&nbsp;attach()</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#attach()">Transaction</a></code></strong></div>
<div class="block">Attaches this transaction to the current thread, if it has been
 detached. Attaching a transaction also attaches any parent and nested
 child transactions.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#attach()">attach</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
</dl>
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<h4>preCommit</h4>
<pre>public&nbsp;boolean&nbsp;preCommit()
                  throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html#preCommit()">Transaction</a></code></strong></div>
<div class="block">Calling this method commits all nested child transactions, closes all
 scoped cursors, and locks out some interactions from other threads. The
 commit method must still be called to finish the commit. Most applications
 have no use for pre-commit and should only ever call commit.

 <p>The intent of this method is to complete as many operations as
 possible leading up to the actual commit. If pre-commit succeeds, then
 commit will most likely succeed as well. While in a pre-commit state, the
 transaction can still be used by the current thread. Calling pre-commit
 again ensures that child transactions and cursors are closed.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/Transaction.html#preCommit()">preCommit</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/Transaction.html" title="interface in com.amazon.carbonado">Transaction</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>false if transaction has exited</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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