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<div class="aboutLanguage"><em><b>Berkeley DB</b><br><font size="-1"> version 6.1.29</font></em></div>
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<h2 title="Class TransactionRunner" class="title">Class TransactionRunner</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>com.sleepycat.collections.TransactionRunner</li>
</ul>
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<pre>public class <span class="strong">TransactionRunner</span>
extends java.lang.Object</pre>
<div class="block">Starts a transaction, calls <a href="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><code>TransactionWorker.doWork()</code></a>, and handles
transaction retry and exceptions. To perform a transaction, the user
implements the <a href="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections"><code>TransactionWorker</code></a> interface and passes an instance of
that class to the <a href="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)"><code>run</code></a> method.
<p>A single TransactionRunner instance may be used by any number of threads
for any number of transactions.</p>
<p>The behavior of the run() method depends on whether the environment is
transactional, whether nested transactions are enabled, and whether a
transaction is already active.</p>
<ul>
<li>When the run() method is called in a transactional environment and no
transaction is active for the current thread, a new transaction is started
before calling doWork(). If DeadlockException is thrown by doWork(),
the transaction will be aborted and the process will be repeated up to the
maximum number of retries. If another exception is thrown by doWork() or
the maximum number of retries has occurred, the transaction will be aborted
and the exception will be rethrown by the run() method. If no exception is
thrown by doWork(), the transaction will be committed. The run() method
will not attempt to commit or abort a transaction if it has already been
committed or aborted by doWork().</li>
<li>When the run() method is called and a transaction is active for the
current thread, and nested transactions are enabled, a nested transaction is
started before calling doWork(). The transaction that is active when
calling the run() method will become the parent of the nested transaction.
The nested transaction will be committed or aborted by the run() method
following the same rules described above. Note that nested transactions may
not be enabled for the JE product, since JE does not support nested
transactions.</li>
<li>When the run() method is called in a non-transactional environment, the
doWork() method is called without starting a transaction. The run() method
will return without committing or aborting a transaction, and any exceptions
thrown by the doWork() method will be thrown by the run() method.</li>
<li>When the run() method is called and a transaction is active for the
current thread and nested transactions are not enabled (the default) the
same rules as above apply. All the operations performed by the doWork()
method will be part of the currently active transaction.</li>
</ul>
<p>In a transactional environment, the rules described above support nested
calls to the run() method and guarantee that the outermost call will cause
the transaction to be committed or aborted. This is true whether or not
nested transactions are supported or enabled. Note that nested transactions
are provided as an optimization for improving concurrency but do not change
the meaning of the outermost transaction. Nested transactions are not
currently supported by the JE product.</p></div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#DEFAULT_MAX_RETRIES">DEFAULT_MAX_RETRIES</a></strong></code>
<div class="block">The default maximum number of retries.</div>
</td>
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<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#TransactionRunner(com.sleepycat.db.Environment)">TransactionRunner</a></strong>(<a href="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</a> env)</code>
<div class="block">Creates a transaction runner for a given Berkeley DB environment.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#TransactionRunner(com.sleepycat.db.Environment,%20int,%20com.sleepycat.db.TransactionConfig)">TransactionRunner</a></strong>(<a href="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</a> env,
int maxRetries,
<a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> config)</code>
<div class="block">Creates a transaction runner for a given Berkeley DB environment and
with a given number of maximum retries.</div>
</td>
</tr>
</table>
</li>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#getAllowNestedTransactions()">getAllowNestedTransactions</a></strong>()</code>
<div class="block">Returns whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#getMaxRetries()">getMaxRetries</a></strong>()</code>
<div class="block">Returns the maximum number of retries that will be performed when
deadlocks are detected.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#getTransactionConfig()">getTransactionConfig</a></strong>()</code>
<div class="block">Returns the transaction configuration used for calling
<a href="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction,%20com.sleepycat.db.TransactionConfig)"><code>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#handleException(java.lang.Exception,%20int,%20int)">handleException</a></strong>(java.lang.Exception exception,
int retries,
int maxRetries)</code>
<div class="block">Handles exceptions that occur during a transaction, and may implement
transaction retry policy.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)">run</a></strong>(<a href="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections">TransactionWorker</a> worker)</code>
<div class="block">Calls the <a href="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><code>TransactionWorker.doWork()</code></a> method and, for transactional
environments, may begin and end a transaction.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#setAllowNestedTransactions(boolean)">setAllowNestedTransactions</a></strong>(boolean allowNestedTxn)</code>
<div class="block">Changes whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#setMaxRetries(int)">setMaxRetries</a></strong>(int maxRetries)</code>
<div class="block">Changes the maximum number of retries that will be performed when
deadlocks are detected.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/collections/TransactionRunner.html#setTransactionConfig(com.sleepycat.db.TransactionConfig)">setTransactionConfig</a></strong>(<a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> config)</code>
<div class="block">Changes the transaction configuration used for calling
<a href="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction,%20com.sleepycat.db.TransactionConfig)"><code>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</code></a>.</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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<h4>DEFAULT_MAX_RETRIES</h4>
<pre>public static final int DEFAULT_MAX_RETRIES</pre>
<div class="block">The default maximum number of retries.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#com.sleepycat.collections.TransactionRunner.DEFAULT_MAX_RETRIES">Constant Field Values</a></dd></dl>
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<h4>TransactionRunner</h4>
<pre>public TransactionRunner(<a href="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</a> env)</pre>
<div class="block">Creates a transaction runner for a given Berkeley DB environment.
The default maximum number of retries (<a href="../../../com/sleepycat/collections/TransactionRunner.html#DEFAULT_MAX_RETRIES"><code>DEFAULT_MAX_RETRIES</code></a>) and
a null (default) <a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db"><code>TransactionConfig</code></a> will be used.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>env</code> - is the environment for running transactions.</dd></dl>
</li>
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<a name="TransactionRunner(com.sleepycat.db.Environment, int, com.sleepycat.db.TransactionConfig)">
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<h4>TransactionRunner</h4>
<pre>public TransactionRunner(<a href="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</a> env,
int maxRetries,
<a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> config)</pre>
<div class="block">Creates a transaction runner for a given Berkeley DB environment and
with a given number of maximum retries.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>env</code> - is the environment for running transactions.</dd><dd><code>maxRetries</code> - is the maximum number of retries that will be
performed when deadlocks are detected.</dd><dd><code>config</code> - the transaction configuration used for calling
<a href="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction,%20com.sleepycat.db.TransactionConfig)"><code>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</code></a>, or null to use the default
configuration. The configuration object is not cloned, and
any modifications to it will impact subsequent transactions.</dd></dl>
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<h4>getMaxRetries</h4>
<pre>public int getMaxRetries()</pre>
<div class="block">Returns the maximum number of retries that will be performed when
deadlocks are detected.</div>
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<h4>setMaxRetries</h4>
<pre>public void setMaxRetries(int maxRetries)</pre>
<div class="block">Changes the maximum number of retries that will be performed when
deadlocks are detected.
Calling this method does not impact transactions already running.</div>
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<h4>getAllowNestedTransactions</h4>
<pre>public boolean getAllowNestedTransactions()</pre>
<div class="block">Returns whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.
By default this property is false.
<p>Note that this method always returns false in the JE product, since
nested transactions are not supported by JE.</p></div>
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<h4>setAllowNestedTransactions</h4>
<pre>public void setAllowNestedTransactions(boolean allowNestedTxn)</pre>
<div class="block">Changes whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.
Calling this method does not impact transactions already running.
<p>Note that true may not be passed to this method in the JE product,
since nested transactions are not supported by JE.</p></div>
</li>
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<a name="getTransactionConfig()">
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<h4>getTransactionConfig</h4>
<pre>public <a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> getTransactionConfig()</pre>
<div class="block">Returns the transaction configuration used for calling
<a href="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction,%20com.sleepycat.db.TransactionConfig)"><code>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</code></a>.
<p>If this property is null, the default configuration is used. The
configuration object is not cloned, and any modifications to it will
impact subsequent transactions.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the transaction configuration.</dd></dl>
</li>
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<a name="setTransactionConfig(com.sleepycat.db.TransactionConfig)">
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<h4>setTransactionConfig</h4>
<pre>public void setTransactionConfig(<a href="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</a> config)</pre>
<div class="block">Changes the transaction configuration used for calling
<a href="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction,%20com.sleepycat.db.TransactionConfig)"><code>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</code></a>.
<p>If this property is null, the default configuration is used. The
configuration object is not cloned, and any modifications to it will
impact subsequent transactions.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>config</code> - the transaction configuration.</dd></dl>
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<h4>run</h4>
<pre>public void run(<a href="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections">TransactionWorker</a> worker)
throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a>,
java.lang.Exception</pre>
<div class="block">Calls the <a href="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><code>TransactionWorker.doWork()</code></a> method and, for transactional
environments, may begin and end a transaction. If the environment given
is non-transactional, a transaction will not be used but the doWork()
method will still be called. See the class description for more
information.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</a></code> - when it is thrown by doWork() and the
maximum number of retries has occurred. The transaction will have been
aborted by this method.</dd>
<dd><code>java.lang.Exception</code> - when any other exception is thrown by doWork(). The
exception will first be unwrapped by calling <a href="../../../com/sleepycat/util/ExceptionUnwrapper.html#unwrap(java.lang.Exception)"><code>ExceptionUnwrapper.unwrap(java.lang.Exception)</code></a>. The transaction will have been aborted by
this method.</dd>
<dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl>
</li>
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<h4>handleException</h4>
<pre>public int handleException(java.lang.Exception exception,
int retries,
int maxRetries)
throws java.lang.Exception</pre>
<div class="block">Handles exceptions that occur during a transaction, and may implement
transaction retry policy. The transaction is aborted by the <a href="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)"><code>run</code></a> method before calling this method.
<p>The default implementation of this method throws the <code>exception</code> parameter if it is not an instance of <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> and otherwise returns the <code>maxRetries</code>
parameter value. This method can be overridden to throw a different
exception or return a different number of retries. For example:</p>
<ul>
<li>This method could call <code>Thread.sleep</code> for a short interval to
allow other transactions to finish.</li>
<li>This method could return a different <code>maxRetries</code> value
depending on the <code>exception</code> that occurred.</li>
<li>This method could throw an application-defined exception when the
<code>retries</code> value is greater or equal to the <code>maxRetries</code> and
a <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a> occurs, to override the default behavior
which is to throw the <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a>.</li>
</ul></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>exception</code> - an exception that was thrown by the <a href="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><code>TransactionWorker.doWork()</code></a> method or thrown when beginning or committing
the transaction. If the <code>retries</code> value is greater or equal to
<code>maxRetries</code> when this method returns normally, this exception
will be thrown by the <a href="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)"><code>run</code></a> method.</dd><dd><code>retries</code> - the current value of a counter that starts out at zero
and is incremented when each retry is performed.</dd><dd><code>maxRetries</code> - the maximum retries to be performed. By default,
this value is set to <a href="../../../com/sleepycat/collections/TransactionRunner.html#getMaxRetries()"><code>getMaxRetries()</code></a>. This method may return a
different maximum retries value to override that default.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the maximum number of retries to perform. The
default policy is to return the <code>maxRetries</code> parameter value
if the <code>exception</code> parameter value is an instance of <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - to cause the exception to be thrown by the <a href="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)"><code>run</code></a> method. The default policy is to throw the <code>exception</code>
parameter value if it is not an instance of <a href="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db"><code>DeadlockException</code></a>.</dd><dt><span class="strong">Since:</span></dt>
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