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<h2 title="Class FileSnap" class="title">Class FileSnap</h2>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></dd>
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<pre>public class <span class="typeNameLabel">FileSnap</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></pre>
<div class="block">This class implements the snapshot interface.
it is responsible for storing, serializing
and deserializing the right snapshot.
and provides access to the snapshots.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileSnap.html#SNAP_MAGIC">SNAP_MAGIC</a></span></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileSnap.html#SNAPSHOT_FILE_PREFIX">SNAPSHOT_FILE_PREFIX</a></span></code> </td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileSnap.html#FileSnap-java.io.File-">FileSnap</a></span>(<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> snapDir)</code> </td>
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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/FileSnap.html#close--">close</a></span>()</code>
<div class="block">synchronized close just so that if serialize is in place
the close operation will block and will wait till serialize
is done and will set the close flag</div>
</td>
</tr>
<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/FileSnap.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 most recent snapshot</div>
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</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileSnap.html#deserialize-org.apache.zookeeper.server.DataTree-java.util.Map-org.apache.jute.InputArchive-">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,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/InputArchive.html?is-external=true" title="class or interface in org.apache.jute">InputArchive</a> ia)</code>
<div class="block">deserialize the datatree from an inputarchive</div>
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<tr id="i3" class="rowColor">
<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/FileSnap.html#findMostRecentSnapshot--">findMostRecentSnapshot</a></span>()</code>
<div class="block">find the most recent snapshot in the database.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<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/FileSnap.html#findNRecentSnapshots-int-">findNRecentSnapshots</a></span>(int n)</code>
<div class="block">find the last n snapshots.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<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/FileSnap.html#findNValidSnapshots-int-">findNValidSnapshots</a></span>(int n)</code>
<div class="block">find the last (maybe) valid n snapshots.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<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/FileSnap.html#getLastSnapshotInfo--">getLastSnapshotInfo</a></span>()</code>
<div class="block">get information of the last saved/restored snapshot</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileSnap.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> snapShot,
boolean fsync)</code>
<div class="block">serialize the datatree and session into the file snapshot</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileSnap.html#serialize-org.apache.zookeeper.server.DataTree-java.util.Map-org.apache.jute.OutputArchive-org.apache.zookeeper.server.persistence.FileHeader-">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="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/OutputArchive.html?is-external=true" title="class or interface in org.apache.jute">OutputArchive</a> oa,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/persistence/FileHeader.html?is-external=true" title="class or interface in org.apache.zookeeper.server.persistence">FileHeader</a> header)</code>
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<h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>SNAP_MAGIC</h4>
<pre>public static final int SNAP_MAGIC</pre>
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<pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> SNAPSHOT_FILE_PREFIX</pre>
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<pre>public FileSnap(<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> snapDir)</pre>
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<pre>public <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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#getLastSnapshotInfo--">getLastSnapshotInfo</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>info of last snapshot</dd>
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<h4>deserialize</h4>
<pre>public 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 most recent snapshot</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#deserialize-org.apache.zookeeper.server.DataTree-java.util.Map-">deserialize</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></code></dd>
<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 zxid of 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>deserialize</h4>
<pre>public void 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,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/InputArchive.html?is-external=true" title="class or interface in org.apache.jute">InputArchive</a> ia)
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 the datatree from an inputarchive</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dt</code> - the datatree to be serialized into</dd>
<dd><code>sessions</code> - the sessions to be filled up</dd>
<dd><code>ia</code> - the input archive to restore from</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>public <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()</pre>
<div class="block">find the most recent snapshot in the database.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#findMostRecentSnapshot--">findMostRecentSnapshot</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the file containing the most recent snapshot</dd>
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<h4>findNValidSnapshots</h4>
<pre>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<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>> findNValidSnapshots(int n)</pre>
<div class="block">find the last (maybe) valid n snapshots. this does some
minor checks on the validity of the snapshots. It just
checks for / at the end of the snapshot. This does
not mean that the snapshot is truly valid but is
valid with a high probability. also, the most recent
will be first on the list.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>n</code> - the number of most recent snapshots</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the last n snapshots (the number might be
less than n in case enough snapshots are not available).</dd>
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<h4>findNRecentSnapshots</h4>
<pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<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>> findNRecentSnapshots(int n)
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 last n snapshots. this does not have
any checks if the snapshot might be valid or not</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>n</code> - the number of most recent snapshots</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the last n snapshots</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>protected 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="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/OutputArchive.html?is-external=true" title="class or interface in org.apache.jute">OutputArchive</a> oa,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/persistence/FileHeader.html?is-external=true" title="class or interface in org.apache.zookeeper.server.persistence">FileHeader</a> header)
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">serialize the datatree and sessions</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dt</code> - the datatree to be serialized</dd>
<dd><code>sessions</code> - the sessions to be serialized</dd>
<dd><code>oa</code> - the output archive to serialize into</dd>
<dd><code>header</code> - the header of this 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>public 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> snapShot,
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">serialize the datatree and session into the file snapshot</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#serialize-org.apache.zookeeper.server.DataTree-java.util.Map-java.io.File-boolean-">serialize</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dt</code> - the datatree to be serialized</dd>
<dd><code>sessions</code> - the sessions to be serialized</dd>
<dd><code>snapShot</code> - the file to store snapshot into</dd>
<dd><code>fsync</code> - sync the file 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>close</h4>
<pre>public 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">synchronized close just so that if serialize is in place
the close operation will block and will wait till serialize
is done and will set the close flag</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html#close--">close</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/SnapShot.html" title="interface in org.apache.zookeeper.server.persistence">SnapShot</a></code></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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