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Yasuhiro KIMURA
329 lines
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<div class="aboutLanguage"><b>Berkeley DB</b><br><font size="-1"> version 18.1.40</font></div>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.sleepycat.db</a></div>
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<h2 title="Interface BackupHandler" class="title">Interface BackupHandler</h2>
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<pre>public interface <span class="typeNameLabel">BackupHandler</span></pre>
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<div class="block">An interface that can optionally be used to override the default behavior
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performed by the
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<a href="Environment.html#backup-java.lang.String-com.sleepycat.db.BackupOptions-"><code>Environment.backup</code></a>
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and
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<a href="Environment.html#backupDatabase-java.lang.String-java.lang.String-boolean-"><code>Environment.backupDatabase</code></a>
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methods. Implementation of this interface is required if the
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Environment.backup or Environment.backupDatabase target parameter is null.
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<p>
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You configure the environment with this handler using the
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<a href="EnvironmentConfig.html#setBackupHandler-com.sleepycat.db.BackupHandler-"><code>EnvironmentConfig.setBackupHandler</code></a>
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method.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#close-java.lang.String-">close</a></span>​(java.lang.String dbname)</code></th>
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<td class="colLast">
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<div class="block">Called when ending a backup and closing a backup target.</div>
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</td>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#open-java.lang.String-java.lang.String-">open</a></span>​(java.lang.String target,
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java.lang.String dbname)</code></th>
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<td class="colLast">
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<div class="block">Called when a target location is opened during a backup.</div>
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</td>
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#write-long-byte:A-int-int-">write</a></span>​(long file_pos,
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byte[] buf,
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int off,
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int len)</code></th>
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<td class="colLast">
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<div class="block">Called when writing data during a backup.</div>
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<h4>close</h4>
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<pre class="methodSignature">int close​(java.lang.String dbname)</pre>
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<div class="block">Called when ending a backup and closing a backup target.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>dbname</code> - The name of the database that has been backed up.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>error code; zero if there is no error</dd>
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</dl>
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<h4>open</h4>
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<pre class="methodSignature">int open​(java.lang.String target,
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java.lang.String dbname)</pre>
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<div class="block">Called when a target location is opened during a backup. This method
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should do whatever is necessary to prepare the backup destination for
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writing the data.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>target</code> - The backup's directory destination.
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<p></dd>
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<dd><code>dbname</code> - The name of the database being backed up.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>error code; zero if there is no error</dd>
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</dl>
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<h4>write</h4>
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<pre class="methodSignature">int write​(long file_pos,
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byte[] buf,
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int off,
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int len)</pre>
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<div class="block">Called when writing data during a backup.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>file_pos</code> - Identifies the position in the target file where the bytes
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from the buffer should be written.
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<p></dd>
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<dd><code>buf</code> - Identifies the buffer which contains the data to be backed up.
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<p></dd>
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<dd><code>off</code> - Specifies the start of the data in the buffer. This will always be
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zero.
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<p></dd>
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<dd><code>len</code> - Identifies the number of bytes to back up from the buffer.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>error code; zero if there is no error</dd>
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