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<div class="subTitle">org.apache.edgent.connectors.file</div>
<h2 title="Class FileWriterPolicy" class="title">Class FileWriterPolicy&lt;T&gt;</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.edgent.connectors.file.FileWriterPolicy&lt;T&gt;</li>
</ul>
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<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - stream tuple type</dd>
</dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;T&gt;</dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/edgent/connectors/file/CompressedFileWriterPolicy.html" title="class in org.apache.edgent.connectors.file">CompressedFileWriterPolicy</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="typeNameLabel">FileWriterPolicy&lt;T&gt;</span>
extends java.lang.Object
implements org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;T&gt;</pre>
<div class="block">A full featured <code>IFileWriterPolicy</code> implementation.
<p>
The policy implements strategies for:
<ul>
<li>Active and final file pathname control.</li>
<li>Active file flush control (via @{link FileWriterFlushControl})</li>
<li>Active file cycle control (when to close/finalize the current active file;
via @{link FileWriterCycleControl})</li>
<li>file retention control (via @{link FileWriterRetentionControl})</li>
</ul>
The policy is very configurable. If additional flexibility is required
the class can be extended and documented "hook" methods overridden,
or an alternative full implementation of <code>FileWriterPolicy</code> can be
created.
<p>
Sample use:
<pre>
FileWriterPolicy&lt;String&gt; policy = new FileWriterPolicy(
FileWriterFlushConfig.newImplicitConfig(),
FileWriterCycleConfig.newCountBasedConfig(1000),
FileWriterRetentionConfig.newCountBasedConfig(10));
String basePathname = "/some/directory/and_base_name";
TStream&lt;String&gt; streamToWrite = ...
FileStreams.textFileWriter(streamToWrite, () -&gt; basePathname, () -&gt; policy)
</pre></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/edgent/connectors/file/FileWriterFlushConfig.html" title="class in org.apache.edgent.connectors.file"><code>FileWriterFlushConfig</code></a>,
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterCycleConfig.html" title="class in org.apache.edgent.connectors.file"><code>FileWriterCycleConfig</code></a>,
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterRetentionConfig.html" title="class in org.apache.edgent.connectors.file"><code>FileWriterRetentionConfig</code></a></dd>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#FileWriterPolicy--">FileWriterPolicy</a></span>()</code>
<div class="block">Create a new file writer policy instance.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#FileWriterPolicy-org.apache.edgent.connectors.file.FileWriterFlushConfig-org.apache.edgent.connectors.file.FileWriterCycleConfig-org.apache.edgent.connectors.file.FileWriterRetentionConfig-">FileWriterPolicy</a></span>(<a href="../../../../../org/apache/edgent/connectors/file/FileWriterFlushConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterFlushConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;&nbsp;flushConfig,
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterCycleConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterCycleConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;&nbsp;cycleConfig,
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterRetentionConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterRetentionConfig</a>&nbsp;retentionConfig)</code>
<div class="block">Create a new file writer policy instance.</div>
</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#close--">close</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>java.nio.file.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#closeActiveFile-java.nio.file.Path-">closeActiveFile</a></span>(java.nio.file.Path&nbsp;path)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/edgent/connectors/file/FileWriterCycleConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterCycleConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#getCycleConfig--">getCycleConfig</a></span>()</code>
<div class="block">Get the policy's active file cycle configuration</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/edgent/connectors/file/FileWriterFlushConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterFlushConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#getFlushConfig--">getFlushConfig</a></span>()</code>
<div class="block">Get the policy's active file flush configuration</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>java.nio.file.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#getNextActiveFilePath--">getNextActiveFilePath</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/edgent/connectors/file/FileWriterRetentionConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterRetentionConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#getRetentionConfig--">getRetentionConfig</a></span>()</code>
<div class="block">Get the policy's retention configuration</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>protected java.nio.file.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#hookGenerateFinalFilePath-java.nio.file.Path-">hookGenerateFinalFilePath</a></span>(java.nio.file.Path&nbsp;path)</code>
<div class="block">Generate the final file path for the active file.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>protected java.nio.file.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#hookGenerateNextActiveFilePath--">hookGenerateNextActiveFilePath</a></span>()</code>
<div class="block">Generate the path for the next active file.</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/edgent/connectors/file/FileWriterPolicy.html#hookRenameFile-java.nio.file.Path-java.nio.file.Path-">hookRenameFile</a></span>(java.nio.file.Path&nbsp;activePath,
java.nio.file.Path&nbsp;finalPath)</code>
<div class="block">"Rename" the active file to the final path.</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/edgent/connectors/file/FileWriterPolicy.html#initialize-java.lang.String-java.io.Flushable-java.io.Closeable-">initialize</a></span>(java.lang.String&nbsp;basePathname,
java.io.Flushable&nbsp;flushable,
java.io.Closeable&nbsp;closeable)</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#shouldCycle--">shouldCycle</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#shouldFlush--">shouldFlush</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#toString--">toString</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#wrote-T-long-">wrote</a></span>(<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&nbsp;tuple,
long&nbsp;nbytes)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>FileWriterPolicy</h4>
<pre>public&nbsp;FileWriterPolicy()</pre>
<div class="block">Create a new file writer policy instance.
<p>
The configuration is:
<ul>
<li>10 second time based active file flushing</li>
<li>1MB file size based active file cycling</li>
<li>10 file retention count</li>
</ul>
The active and final file pathname behavior is specified in
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#FileWriterPolicy-org.apache.edgent.connectors.file.FileWriterFlushConfig-org.apache.edgent.connectors.file.FileWriterCycleConfig-org.apache.edgent.connectors.file.FileWriterRetentionConfig-"><code>FileWriterPolicy(FileWriterFlushConfig, FileWriterCycleConfig, FileWriterRetentionConfig)</code></a></div>
</li>
</ul>
<a name="FileWriterPolicy-org.apache.edgent.connectors.file.FileWriterFlushConfig-org.apache.edgent.connectors.file.FileWriterCycleConfig-org.apache.edgent.connectors.file.FileWriterRetentionConfig-">
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<h4>FileWriterPolicy</h4>
<pre>public&nbsp;FileWriterPolicy(<a href="../../../../../org/apache/edgent/connectors/file/FileWriterFlushConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterFlushConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;&nbsp;flushConfig,
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterCycleConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterCycleConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;&nbsp;cycleConfig,
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterRetentionConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterRetentionConfig</a>&nbsp;retentionConfig)</pre>
<div class="block">Create a new file writer policy instance.
<p>
<code>flushConfig</code>, <code>cycleConfig</code> and <code>retentionConfig</code>
specify the configuration of the various controls.
<p>
The active file and final file pathnames are based
on the <code>basePathname</code> received in
<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#initialize-java.lang.String-java.io.Flushable-java.io.Closeable-"><code>initialize(String, Flushable, Closeable)</code></a>.
<p>
Where <code>parent</code> and <code>baseLeafname</code> are the
parent path and file name respectively of <code>basePathname</code>:
<ul>
<li>the active file is <code>parent/.baseLeafname</code>"</li>
<li>final file names are <code>parent/baseLeafname_YYYYMMDD_HHMMSS[_&lt;n&gt;]</code>
where the optional <code>_&lt;n&gt;</code> suffix is only present if needed
to distinguish a file from the previously finalized file.
<code>&lt;n&gt;</code> starts at 1 and is monotonically incremented.
</li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>flushConfig</code> - active file flush control configuration</dd>
<dd><code>cycleConfig</code> - active file cycle control configuration</dd>
<dd><code>retentionConfig</code> - final file retention control configuration</dd>
</dl>
</li>
</ul>
</li>
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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>close</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
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<h4>getFlushConfig</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterFlushConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterFlushConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;&nbsp;getFlushConfig()</pre>
<div class="block">Get the policy's active file flush configuration</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the flush configuration</dd>
</dl>
</li>
</ul>
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<h4>getCycleConfig</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterCycleConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterCycleConfig</a>&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;&nbsp;getCycleConfig()</pre>
<div class="block">Get the policy's active file cycle configuration</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the cycle configuration</dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterRetentionConfig.html" title="class in org.apache.edgent.connectors.file">FileWriterRetentionConfig</a>&nbsp;getRetentionConfig()</pre>
<div class="block">Get the policy's retention configuration</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the retention configuration</dd>
</dl>
</li>
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<a name="initialize-java.lang.String-java.io.Flushable-java.io.Closeable-">
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<h4>initialize</h4>
<pre>public&nbsp;void&nbsp;initialize(java.lang.String&nbsp;basePathname,
java.io.Flushable&nbsp;flushable,
java.io.Closeable&nbsp;closeable)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>initialize</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
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<pre>public&nbsp;void&nbsp;wrote(<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&nbsp;tuple,
long&nbsp;nbytes)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>wrote</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
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<pre>public&nbsp;boolean&nbsp;shouldFlush()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>shouldFlush</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
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<h4>shouldCycle</h4>
<pre>public&nbsp;boolean&nbsp;shouldCycle()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>shouldCycle</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
</dl>
</li>
</ul>
<a name="getNextActiveFilePath--">
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<h4>getNextActiveFilePath</h4>
<pre>public&nbsp;java.nio.file.Path&nbsp;getNextActiveFilePath()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getNextActiveFilePath</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
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<h4>closeActiveFile</h4>
<pre>public&nbsp;java.nio.file.Path&nbsp;closeActiveFile(java.nio.file.Path&nbsp;path)
throws java.io.IOException</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>closeActiveFile</code>&nbsp;in interface&nbsp;<code>org.apache.edgent.connectors.file.runtime.IFileWriterPolicy&lt;<a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html" title="type parameter in FileWriterPolicy">T</a>&gt;</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd>
</dl>
</li>
</ul>
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<h4>hookGenerateFinalFilePath</h4>
<pre>protected&nbsp;java.nio.file.Path&nbsp;hookGenerateFinalFilePath(java.nio.file.Path&nbsp;path)</pre>
<div class="block">Generate the final file path for the active file.
<p>
The default implementation yields:
<br>
final file names are <code>basePathname_YYYYMMDD_HHMMSS[_&lt;n&gt;]</code>
where the optional <code>_&lt;n&gt;</code> suffix is only present if needed
to distinguish a file from the previously finalized file.
<code>&lt;n&gt;</code> starts at 1 and is monitonically incremented.
<p>
This hook method can be overridden.
<p>
Note, the implementation must handle the unlikely, but happens
in tests, case where files are cycling very fast (multiple per sec)
and the retention config tosses some within that same second.
I.e., avoid generating final path sequences like:
<pre>
leaf_YYYYMMDD_103099
leaf_YYYYMMDD_103099_1
leaf_YYYYMMDD_103099_2
delete leaf_YYYYMMDD_103099 -- retention cnt was 2
leaf_YYYYMMDD_103099 // should be _3
</pre></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>path</code> - the active file path to finalize</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>final path for the file</dd>
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<pre>protected&nbsp;java.nio.file.Path&nbsp;hookGenerateNextActiveFilePath()</pre>
<div class="block">Generate the path for the next active file.
<p>
The default implementation yields <code>parent/.baseLeafname</code>
from <code>basePathname</code>.
<p>
This hook method can be overridden.
<p>
See <code>IFileWriterPolicy.getNextActiveFilePath()</code> regarding
constraints.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>path to use for the next active file.</dd>
</dl>
</li>
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<h4>hookRenameFile</h4>
<pre>protected&nbsp;void&nbsp;hookRenameFile(java.nio.file.Path&nbsp;activePath,
java.nio.file.Path&nbsp;finalPath)
throws java.io.IOException</pre>
<div class="block">"Rename" the active file to the final path.
<p>
The default implementation uses <code>java.io.File.renameTo()</code>
and works for the default <a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#hookGenerateNextActiveFilePath--"><code>hookGenerateNextActiveFilePath()</code></a>
and <a href="../../../../../org/apache/edgent/connectors/file/FileWriterPolicy.html#hookGenerateFinalFilePath-java.nio.file.Path-"><code>hookGenerateFinalFilePath(Path path)</code></a> implementations.
<p>
This hook method can be overridden.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>activePath</code> - path of the active file</dd>
<dd><code>finalPath</code> - path to the final destination</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - on failure</dd>
</dl>
</li>
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<h4>toString</h4>
<pre>public&nbsp;java.lang.String&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
</dl>
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