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 <div class="subTitle">org.apache.river.reliableLog</div>
 <h2 title="Class ReliableLog" class="title">Class ReliableLog</h2>
 </div>
 <div class="contentContainer">
 <ul class="inheritance">
 <li><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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 <ul class="inheritance">
 <li>org.apache.river.reliableLog.ReliableLog</li>
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 <pre>public class <span class="typeNameLabel">ReliableLog</span>
 extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
 <div class="block">This class is a simple implementation of a reliable Log.  The
  client of a ReliableLog must provide a set of callbacks (via a
  LogHandler) that enables a ReliableLog to read and write snapshots
  (checkpoints) and log records.  This implementation ensures that the
  data stored (via a ReliableLog) is recoverable after a system crash.
  The implementation is unsynchronized; the client must synchronize
  externally. <p>

  The secondary storage strategy is to record values in files using a
  representation of the caller's choosing.  Two sorts of files are
  kept: snapshots and logs.  At any instant, one snapshot is current.
  The log consists of a sequence of updates that have occurred since
  the current snapshot was taken.  The current stable state is the
  value of the snapshot, as modified by the sequence of updates in
  the log.  From time to time, the client of a ReliableLog instructs
  the package to make a new snapshot and clear the log.  A ReliableLog
  arranges disk writes such that updates are stable (as long as the
  changes are force-written to disk) and atomic: no update is lost,
  and each update either is recorded completely in the log or not at
  all.  Making a new snapshot is also atomic. <p>

  Normal use for maintaining the recoverable store is as follows: The
  client maintains the relevant data structure in virtual memory.  As
  updates happen to the structure, the client informs the ReliableLog
  (call it "log") by calling log.update.  Periodically, the client
  calls log.snapshot to provide the current complete contents of the
  data.  On restart, the client calls log.recover to obtain the
  latest snapshot and the following sequences of updates; the client
  applies the updates to the snapshot to obtain the state that
  existed before the crash. <p></div>
 <dl>
 <dt><span class="simpleTagLabel">Author:</span></dt>
 <dd>Sun Microsystems, Inc.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../../org/apache/river/reliableLog/LogHandler.html" title="class in org.apache.river.reliableLog"><code>LogHandler</code></a></dd>
 </dl>
 </li>
 </ul>
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 <h3>Field Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
 <caption><span>Fields</span><span class="tabEnd">&nbsp;</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>private <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#dir">dir</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#format">format</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#FORMAT_PADDED">FORMAT_PADDED</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#FORMAT_UNPADDED">FORMAT_UNPADDED</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="../../../../org/apache/river/reliableLog/LogHandler.html" title="class in org.apache.river.reliableLog">LogHandler</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#handler">handler</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private byte[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#intBuf">intBuf</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#intBytes">intBytes</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/docs/api/java/io/RandomAccessFile.html?is-external=true" title="class or interface in java.io">RandomAccessFile</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#log">log</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#logBytes">logBytes</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/docs/api/java/io/FileDescriptor.html?is-external=true" title="class or interface in java.io">FileDescriptor</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#logFD">logFD</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#logfilePrefix">logfilePrefix</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#logName">logName</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#MAGIC">MAGIC</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#snapshotBytes">snapshotBytes</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#snapshotPrefix">snapshotPrefix</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#version">version</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#versionFile">versionFile</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private byte[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#zeroBuf">zeroBuf</a></span></code>&nbsp;</td>
 </tr>
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 </li>
 </ul>
 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
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 <li class="blockList"><a name="constructor.summary">
 <!--   -->
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 <h3>Constructor Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
 <caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colOne" scope="col">Constructor and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#ReliableLog-java.lang.String-org.apache.river.reliableLog.LogHandler-">ReliableLog</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;dirPath,
            <a href="../../../../org/apache/river/reliableLog/LogHandler.html" title="class in org.apache.river.reliableLog">LogHandler</a>&nbsp;handler)</code>
 <div class="block">Creates a ReliableLog to handle snapshots and logging in a
  stable storage directory, and sets up to recover any existing data
  from the stable storage directory.</div>
 </td>
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 </li>
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 <h3>Method Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#close--">close</a></span>()</code>
 <div class="block">Closes the stable storage directory in an orderly manner.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#deleteFile-java.lang.String-">deleteFile</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
 <div class="block">Deletes a file.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#deleteLogFile-int-">deleteLogFile</a></span>(int&nbsp;ver)</code>
 <div class="block">Removes the incremental update log file.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#deletePersistentStore--">deletePersistentStore</a></span>()</code>
 <div class="block">Closes the incremental update log file, removes all ReliableLog-related
  files from the stable storage directory, and deletes the directory.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#deleteSnapshot-int-">deleteSnapshot</a></span>(int&nbsp;ver)</code>
 <div class="block">Removes the snapshot file.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#fName-java.lang.String-">fName</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
 <div class="block">Generates a filename prepended with the stable storage directory path.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#logSize--">logSize</a></span>()</code>
 <div class="block">Returns the current size of the incremental update log file in bytes;</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#openLogFile--">openLogFile</a></span>()</code>
 <div class="block">Opens the incremental update log file in read/write mode.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#recover--">recover</a></span>()</code>
 <div class="block">Retrieves the contents of the snapshot file by calling the client
  supplied recover callback and then applies the incremental updates
  by calling the readUpdate callback for each logged updated.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#snapshot--">snapshot</a></span>()</code>
 <div class="block">Records the client-defined current snapshot by invoking the client
  supplied snapshot callback, and then empties the log of incremental
  updates.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#snapshotSize--">snapshotSize</a></span>()</code>
 <div class="block">Returns the size of the current snapshot file in bytes;</div>
 </td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#update-java.lang.Object-">update</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</code>
 <div class="block">Records this update in the log file and forces the update to disk.</div>
 </td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#update-java.lang.Object-boolean-">update</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value,
       boolean&nbsp;forceToDisk)</code>
 <div class="block">Records this update in the log file and optionally forces the update
  to disk.</div>
 </td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#versionName-java.lang.String-">versionName</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
 <div class="block">Generates a version filename prepended with the stable storage
  directory path with the current version number as a suffix.</div>
 </td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/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/river/reliableLog/ReliableLog.html#versionName-java.lang.String-int-">versionName</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;prefix,
            int&nbsp;ver)</code>
 <div class="block">Generates a version filename prepended with the stable storage
  directory path with the given version number as a suffix.</div>
 </td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#writeInt-java.io.DataOutput-int-">writeInt</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out,
         int&nbsp;val)</code>
 <div class="block">Write an int value in single write operation.</div>
 </td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/reliableLog/ReliableLog.html#writeVersionFile--">writeVersionFile</a></span>()</code>
 <div class="block">Writes the current version number to the version file.</div>
 </td>
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 <!--   -->
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 <h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
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 <pre>public&nbsp;ReliableLog(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;dirPath,
                    <a href="../../../../org/apache/river/reliableLog/LogHandler.html" title="class in org.apache.river.reliableLog">LogHandler</a>&nbsp;handler)
             throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Creates a ReliableLog to handle snapshots and logging in a
  stable storage directory, and sets up to recover any existing data
  from the stable storage directory. If there is no existing data,
  snapshot must be called next, otherwise recover must be called next.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>dirPath</code> - path to the stable storage directory</dd>
 <dd><code>handler</code> - the handler for log callbacks</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if the directory cannot be created or
  the current version in the directory is corrupted</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if any other I/O error occurs</dd>
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 <pre>public&nbsp;void&nbsp;recover()
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 <div class="block">Retrieves the contents of the snapshot file by calling the client
  supplied recover callback and then applies the incremental updates
  by calling the readUpdate callback for each logged updated.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if recovery fails due to serious log corruption,
  or if an exception is thrown by the recover or readUpdate callbacks</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an other I/O error occurs</dd>
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 <div class="block">Records this update in the log file and forces the update to disk.
  The update is recorded by calling the client's writeUpdate callback.
  This method must not be called until this log's recover method has
  been invoked (and completed).</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>value</code> - the object representing the update</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if an exception is thrown by the writeUpdate
  callback, or forcing the update to disk fails</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if any other I/O error occurs</dd>
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 <pre>public&nbsp;void&nbsp;update(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value,
                    boolean&nbsp;forceToDisk)
             throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Records this update in the log file and optionally forces the update
  to disk.  The update is recorded by calling the client's writeUpdate
  callback.  This method must not be called until this log's recover
  method has been invoked (and completed).</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>value</code> - the object representing the update</dd>
 <dd><code>forceToDisk</code> - true if the update should be forced to disk, false
  if the updates should be buffered</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if an exception is thrown by the writeUpdate
  callback, or forcing the update to disk fails</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if any other I/O error occurs</dd>
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 <div class="block">Write an int value in single write operation.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>out</code> - output stream</dd>
 <dd><code>val</code> - int value</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if any other I/O error occurs</dd>
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 <pre>public&nbsp;void&nbsp;snapshot()
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 <div class="block">Records the client-defined current snapshot by invoking the client
  supplied snapshot callback, and then empties the log of incremental
  updates.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if the snapshot callback throws an exception</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if any other I/O error occurs</dd>
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 <pre>public&nbsp;void&nbsp;close()
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 <div class="block">Closes the stable storage directory in an orderly manner.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd>
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 <pre>public&nbsp;long&nbsp;snapshotSize()</pre>
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 <div class="block">Generates a filename prepended with the stable storage directory path.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>name</code> - the name of the file (sans directory path)</dd>
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 <pre>private&nbsp;<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;versionName(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</pre>
 <div class="block">Generates a version filename prepended with the stable storage
  directory path with the current version number as a suffix.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>name</code> - version filename prefix</dd>
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 <pre>private&nbsp;<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;versionName(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;prefix,
                            int&nbsp;ver)</pre>
 <div class="block">Generates a version filename prepended with the stable storage
  directory path with the given version number as a suffix.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>prefix</code> - filename prefix</dd>
 <dd><code>ver</code> - version number</dd>
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 <pre>private&nbsp;void&nbsp;deleteFile(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)
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 <div class="block">Deletes a file.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>name</code> - the name of the file (complete path)</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if file cannot be deleted</dd>
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 <pre>private&nbsp;void&nbsp;deleteSnapshot(int&nbsp;ver)
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 <div class="block">Removes the snapshot file.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>ver</code> - the version to remove</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if file cannot be deleted</dd>
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 <pre>private&nbsp;void&nbsp;deleteLogFile(int&nbsp;ver)
                     throws <a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></pre>
 <div class="block">Removes the incremental update log file.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>ver</code> - the version to remove</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../../org/apache/river/reliableLog/LogException.html" title="class in org.apache.river.reliableLog">LogException</a></code> - if file cannot be deleted</dd>
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 <pre>private&nbsp;void&nbsp;openLogFile()
                   throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Opens the incremental update log file in read/write mode.  If the
  file does not exist, it is created.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd>
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                        throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Writes the current version number to the version file.</div>
 <dl>
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