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<div class="subTitle">org.osgi.service.dmt.spi</div>
<h2 title="Interface TransactionalDataSession" class="title">Interface TransactionalDataSession</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html" title="interface in org.osgi.service.dmt.spi">ReadableDataSession</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html" title="interface in org.osgi.service.dmt.spi">ReadWriteDataSession</a></dd>
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<pre>public interface <span class="typeNameLabel">TransactionalDataSession</span>
extends <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html" title="interface in org.osgi.service.dmt.spi">ReadWriteDataSession</a></pre>
<div class="block">Provides atomic read-write access to the part of the tree handled by the
plugin that created this session.</div>
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<h3>Method Summary</h3>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/osgi/service/dmt/spi/TransactionalDataSession.html#commit--">commit</a></span>()</code>
<div class="block">Commits a series of DMT operations issued in the current atomic session
since the last transaction boundary.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/osgi/service/dmt/spi/TransactionalDataSession.html#rollback--">rollback</a></span>()</code>
<div class="block">Rolls back a series of DMT operations issued in the current atomic
session since the last transaction boundary.</div>
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<h3>Methods inherited from interface org.osgi.service.dmt.spi.<a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html" title="interface in org.osgi.service.dmt.spi">ReadWriteDataSession</a></h3>
<code><a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#copy-java.lang.String:A-java.lang.String:A-boolean-">copy</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#createInteriorNode-java.lang.String:A-java.lang.String-">createInteriorNode</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#createLeafNode-java.lang.String:A-org.osgi.service.dmt.DmtData-java.lang.String-">createLeafNode</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#deleteNode-java.lang.String:A-">deleteNode</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#renameNode-java.lang.String:A-java.lang.String-">renameNode</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#setNodeTitle-java.lang.String:A-java.lang.String-">setNodeTitle</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#setNodeType-java.lang.String:A-java.lang.String-">setNodeType</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadWriteDataSession.html#setNodeValue-java.lang.String:A-org.osgi.service.dmt.DmtData-">setNodeValue</a></code></li>
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<h3>Methods inherited from interface org.osgi.service.dmt.spi.<a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html" title="interface in org.osgi.service.dmt.spi">ReadableDataSession</a></h3>
<code><a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#close--">close</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getChildNodeNames-java.lang.String:A-">getChildNodeNames</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getMetaNode-java.lang.String:A-">getMetaNode</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getNodeSize-java.lang.String:A-">getNodeSize</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getNodeTimestamp-java.lang.String:A-">getNodeTimestamp</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getNodeTitle-java.lang.String:A-">getNodeTitle</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getNodeType-java.lang.String:A-">getNodeType</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getNodeValue-java.lang.String:A-">getNodeValue</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#getNodeVersion-java.lang.String:A-">getNodeVersion</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#isLeafNode-java.lang.String:A-">isLeafNode</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#isNodeUri-java.lang.String:A-">isNodeUri</a>, <a href="../../../../../org/osgi/service/dmt/spi/ReadableDataSession.html#nodeChanged-java.lang.String:A-">nodeChanged</a></code></li>
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<h4>commit</h4>
<pre>void commit()
throws <a href="../../../../../org/osgi/service/dmt/DmtException.html" title="class in org.osgi.service.dmt">DmtException</a></pre>
<div class="block">Commits a series of DMT operations issued in the current atomic session
since the last transaction boundary. Transaction boundaries are the
creation of this object that starts the session, and all subsequent
<a href="../../../../../org/osgi/service/dmt/spi/TransactionalDataSession.html#commit--"><code>commit()</code></a> and <a href="../../../../../org/osgi/service/dmt/spi/TransactionalDataSession.html#rollback--"><code>rollback()</code></a> calls.
<p>
This method can fail even if all operations were successful. This can
happen due to some multi-node semantic constraints defined by a specific
implementation. For example, node A can be required to always have
children A/B, A/C and A/D. If this condition is broken when
<code>commit()</code> is executed, the method will fail, and throw a
<code>METADATA_MISMATCH</code> exception.
<p>
In many cases the tree is not the only way to manage a given part of the
system. It may happen that while modifying some nodes in an atomic
session, the underlying settings are modified parallelly outside the
scope of the DMT. If this is detected during commit, an exception with
the code <code>CONCURRENT_ACCESS</code> is thrown.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/osgi/service/dmt/DmtException.html" title="class in org.osgi.service.dmt">DmtException</a></code> - with the following possible error codes
<ul>
<li><code>METADATA_MISMATCH</code> if the operation failed because of
meta-data restrictions</li><li><code>CONCURRENT_ACCESS</code> if it is
detected that some modification has been made outside the scope
of the DMT to the nodes affected in the session's operations</li>
<li> <code>DATA_STORE_FAILURE</code> if an error occurred while
accessing the data store</li><li><code>COMMAND_FAILED</code> if some
unspecified error is encountered while attempting to complete the
command</li>
</ul></dd>
<dd><code>java.lang.SecurityException</code> - if the caller does not have the necessary
permissions to execute the underlying management operation</dd>
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<h4>rollback</h4>
<pre>void rollback()
throws <a href="../../../../../org/osgi/service/dmt/DmtException.html" title="class in org.osgi.service.dmt">DmtException</a></pre>
<div class="block">Rolls back a series of DMT operations issued in the current atomic
session since the last transaction boundary. Transaction boundaries are
the creation of this object that starts the session, and all subsequent
<a href="../../../../../org/osgi/service/dmt/spi/TransactionalDataSession.html#commit--"><code>commit()</code></a> and <a href="../../../../../org/osgi/service/dmt/spi/TransactionalDataSession.html#rollback--"><code>rollback()</code></a> calls.</div>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/osgi/service/dmt/DmtException.html" title="class in org.osgi.service.dmt">DmtException</a></code> - with the error code <code>ROLLBACK_FAILED</code> in case
the rollback did not succeed</dd>
<dd><code>java.lang.SecurityException</code> - if the caller does not have the necessary
permissions to execute the underlying management operation</dd>
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