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<div class="subTitle">org.apache.zookeeper.server.persistence</div>
<h2 title="Interface SnapShot" class="title">Interface SnapShot</h2>
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<pre>public interface <span class="typeNameLabel">SnapShot</span></pre>
<div class="block">snapshot interface for the persistence layer.
implement this interface for implementing
snapshots.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#close--">close</a></span>()</code>
<div class="block">free resources from this snapshot immediately</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#deserialize-org.apache.zookeeper.server.DataTree-java.util.Map-">deserialize</a></span>(<a href="../../../../../org/apache/zookeeper/server/DataTree.html" title="class in org.apache.zookeeper.server">DataTree</a> dt,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> sessions)</code>
<div class="block">deserialize a data tree from the last valid snapshot and
return the last zxid that was deserialized</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#findMostRecentSnapshot--">findMostRecentSnapshot</a></span>()</code>
<div class="block">find the most recent snapshot file</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapshotInfo.html" title="class in org.apache.zookeeper.server.persistence">SnapshotInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#getLastSnapshotInfo--">getLastSnapshotInfo</a></span>()</code>
<div class="block">get information of the last saved/restored snapshot</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#serialize-org.apache.zookeeper.server.DataTree-java.util.Map-java.io.File-boolean-">serialize</a></span>(<a href="../../../../../org/apache/zookeeper/server/DataTree.html" title="class in org.apache.zookeeper.server">DataTree</a> dt,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> sessions,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> name,
boolean fsync)</code>
<div class="block">persist the datatree and the sessions into a persistence storage</div>
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<h4>deserialize</h4>
<pre>long deserialize(<a href="../../../../../org/apache/zookeeper/server/DataTree.html" title="class in org.apache.zookeeper.server">DataTree</a> dt,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> sessions)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">deserialize a data tree from the last valid snapshot and
return the last zxid that was deserialized</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dt</code> - the datatree to be deserialized into</dd>
<dd><code>sessions</code> - the sessions to be deserialized into</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the last zxid that was deserialized from the snapshot</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>serialize</h4>
<pre>void serialize(<a href="../../../../../org/apache/zookeeper/server/DataTree.html" title="class in org.apache.zookeeper.server">DataTree</a> dt,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> sessions,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> name,
boolean fsync)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">persist the datatree and the sessions into a persistence storage</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dt</code> - the datatree to be serialized</dd>
<dd><code>sessions</code> - the session timeouts to be serialized</dd>
<dd><code>name</code> - the object name to store snapshot into</dd>
<dd><code>fsync</code> - sync the snapshot immediately after write</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>findMostRecentSnapshot</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> findMostRecentSnapshot()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">find the most recent snapshot file</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the most recent snapshot file</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getLastSnapshotInfo</h4>
<pre><a href="../../../../../org/apache/zookeeper/server/persistence/SnapshotInfo.html" title="class in org.apache.zookeeper.server.persistence">SnapshotInfo</a> getLastSnapshotInfo()</pre>
<div class="block">get information of the last saved/restored snapshot</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>info of last snapshot</dd>
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<h4>close</h4>
<pre>void close()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">free resources from this snapshot immediately</div>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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