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<div class="subTitle">com.amazon.carbonado.sequence</div>
<h2 title="Class SequenceValueGenerator" class="title">Class SequenceValueGenerator</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html" title="class in com.amazon.carbonado.sequence">com.amazon.carbonado.sequence.AbstractSequenceValueProducer</a></li>
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<dd><a href="../../../../com/amazon/carbonado/sequence/SequenceValueProducer.html" title="interface in com.amazon.carbonado.sequence">SequenceValueProducer</a></dd>
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<pre>public class <span class="strong">SequenceValueGenerator</span>
extends <a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html" title="class in com.amazon.carbonado.sequence">AbstractSequenceValueProducer</a></pre>
<div class="block">General purpose implementation of a sequence value generator.</div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>1.2</dd>
<dt><span class="strong">Author:</span></dt>
  <dd>Brian S O'Neill, bcastill</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../com/amazon/carbonado/Sequence.html" title="annotation in com.amazon.carbonado"><code>Sequence</code></a>, 
<a href="../../../../com/amazon/carbonado/sequence/StoredSequence.html" title="interface in com.amazon.carbonado.sequence"><code>StoredSequence</code></a></dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#DEFAULT_INCREMENT">DEFAULT_INCREMENT</a></strong></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#DEFAULT_INITIAL_VALUE">DEFAULT_INITIAL_VALUE</a></strong></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#DEFAULT_RESERVE_AMOUNT">DEFAULT_RESERVE_AMOUNT</a></strong></code>&nbsp;</td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#SequenceValueGenerator(com.amazon.carbonado.Repository, java.lang.String)">SequenceValueGenerator</a></strong>(<a href="../../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado">Repository</a>&nbsp;repo,
                      java.lang.String&nbsp;name)</code>
<div class="block">Construct a new SequenceValueGenerator which might create persistent
 sequence data if it does not exist.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#SequenceValueGenerator(com.amazon.carbonado.Repository, java.lang.String, long, int)">SequenceValueGenerator</a></strong>(<a href="../../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado">Repository</a>&nbsp;repo,
                      java.lang.String&nbsp;name,
                      long&nbsp;initialValue,
                      int&nbsp;increment)</code>
<div class="block">Construct a new SequenceValueGenerator which might create persistent
 sequence data if it does not exist.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#SequenceValueGenerator(com.amazon.carbonado.Repository, java.lang.String, long, int, int)">SequenceValueGenerator</a></strong>(<a href="../../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado">Repository</a>&nbsp;repo,
                      java.lang.String&nbsp;name,
                      long&nbsp;initialValue,
                      int&nbsp;increment,
                      int&nbsp;reserveAmount)</code>
<div class="block">Construct a new SequenceValueGenerator which might create persistent
 sequence data if it does not exist.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#nextIntValue()">nextIntValue</a></strong>()</code>
<div class="block">Returns the next value from the sequence, which may wrap negative if all
 positive values are exhausted.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#nextLongValue()">nextLongValue</a></strong>()</code>
<div class="block">Returns the next value from the sequence, which may wrap negative if all
 positive values are exhausted.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#reset(int)">reset</a></strong>(int&nbsp;initialValue)</code>
<div class="block">Reset the sequence.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/amazon/carbonado/sequence/SequenceValueGenerator.html#returnReservedValues()">returnReservedValues</a></strong>()</code>
<div class="block">Allow any unused reserved values to be returned for re-use.</div>
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<h3>Methods inherited from class&nbsp;com.amazon.carbonado.sequence.<a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html" title="class in com.amazon.carbonado.sequence">AbstractSequenceValueProducer</a></h3>
<code><a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html#nextDecimalValue()">nextDecimalValue</a>, <a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html#nextNumericalValue(int, int)">nextNumericalValue</a></code></li>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>DEFAULT_RESERVE_AMOUNT</h4>
<pre>public static final&nbsp;int DEFAULT_RESERVE_AMOUNT</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../constant-values.html#com.amazon.carbonado.sequence.SequenceValueGenerator.DEFAULT_RESERVE_AMOUNT">Constant Field Values</a></dd></dl>
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<h4>DEFAULT_INITIAL_VALUE</h4>
<pre>public static final&nbsp;int DEFAULT_INITIAL_VALUE</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../constant-values.html#com.amazon.carbonado.sequence.SequenceValueGenerator.DEFAULT_INITIAL_VALUE">Constant Field Values</a></dd></dl>
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<h4>DEFAULT_INCREMENT</h4>
<pre>public static final&nbsp;int DEFAULT_INCREMENT</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../constant-values.html#com.amazon.carbonado.sequence.SequenceValueGenerator.DEFAULT_INCREMENT">Constant Field Values</a></dd></dl>
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<h4>SequenceValueGenerator</h4>
<pre>public&nbsp;SequenceValueGenerator(<a href="../../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado">Repository</a>&nbsp;repo,
                      java.lang.String&nbsp;name)
                       throws <a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></pre>
<div class="block">Construct a new SequenceValueGenerator which might create persistent
 sequence data if it does not exist. The initial sequence value is one,
 and the increment is one.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>repo</code> - repository to persist sequence data</dd><dd><code>name</code> - name of sequence</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></code></dd></dl>
</li>
</ul>
<a name="SequenceValueGenerator(com.amazon.carbonado.Repository, java.lang.String, long, int)">
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<h4>SequenceValueGenerator</h4>
<pre>public&nbsp;SequenceValueGenerator(<a href="../../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado">Repository</a>&nbsp;repo,
                      java.lang.String&nbsp;name,
                      long&nbsp;initialValue,
                      int&nbsp;increment)
                       throws <a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></pre>
<div class="block">Construct a new SequenceValueGenerator which might create persistent
 sequence data if it does not exist.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>repo</code> - repository to persist sequence data</dd><dd><code>name</code> - name of sequence</dd><dd><code>initialValue</code> - initial sequence value, if sequence needs to be created</dd><dd><code>increment</code> - amount to increment sequence by</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></code></dd></dl>
</li>
</ul>
<a name="SequenceValueGenerator(com.amazon.carbonado.Repository, java.lang.String, long, int, int)">
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<h4>SequenceValueGenerator</h4>
<pre>public&nbsp;SequenceValueGenerator(<a href="../../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado">Repository</a>&nbsp;repo,
                      java.lang.String&nbsp;name,
                      long&nbsp;initialValue,
                      int&nbsp;increment,
                      int&nbsp;reserveAmount)
                       throws <a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></pre>
<div class="block">Construct a new SequenceValueGenerator which might create persistent
 sequence data if it does not exist.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>repo</code> - repository to persist sequence data</dd><dd><code>name</code> - name of sequence</dd><dd><code>initialValue</code> - initial sequence value, if sequence needs to be created</dd><dd><code>increment</code> - amount to increment sequence by</dd><dd><code>reserveAmount</code> - amount of sequence values to reserve</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/RepositoryException.html" title="class in com.amazon.carbonado">RepositoryException</a></code></dd></dl>
</li>
</ul>
</li>
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<h3>Method Detail</h3>
<a name="reset(int)">
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<ul class="blockList">
<li class="blockList">
<h4>reset</h4>
<pre>public&nbsp;void&nbsp;reset(int&nbsp;initialValue)
           throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a>,
                  <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block">Reset the sequence.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>initialValue</code> - first value produced by sequence</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></dd>
<dd><code><a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></dd></dl>
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<a name="nextLongValue()">
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<h4>nextLongValue</h4>
<pre>public&nbsp;long&nbsp;nextLongValue()
                   throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block">Returns the next value from the sequence, which may wrap negative if all
 positive values are exhausted. When sequence wraps back to initial
 value, the sequence is fully exhausted, and an exception is thrown to
 indicate this.

 <p>Note: this method throws PersistException even for fetch failures
 since this method is called by insert operations. Insert operations can
 only throw a PersistException.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code> - for fetch/persist failure or if sequence is exhausted.</dd></dl>
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<a name="nextIntValue()">
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<li class="blockList">
<h4>nextIntValue</h4>
<pre>public&nbsp;int&nbsp;nextIntValue()
                 throws <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block">Returns the next value from the sequence, which may wrap negative if all
 positive values are exhausted. When sequence wraps back to initial
 value, the sequence is fully exhausted, and an exception is thrown to
 indicate this.

 <p>Note: this method throws PersistException even for fetch failures
 since this method is called by insert operations. Insert operations can
 only throw a PersistException.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/sequence/SequenceValueProducer.html#nextIntValue()">nextIntValue</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/amazon/carbonado/sequence/SequenceValueProducer.html" title="interface in com.amazon.carbonado.sequence">SequenceValueProducer</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html#nextIntValue()">nextIntValue</a></code>&nbsp;in class&nbsp;<code><a href="../../../../com/amazon/carbonado/sequence/AbstractSequenceValueProducer.html" title="class in com.amazon.carbonado.sequence">AbstractSequenceValueProducer</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code> - for fetch/persist failure or if sequence is
 exhausted for int values.</dd></dl>
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<a name="returnReservedValues()">
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<h4>returnReservedValues</h4>
<pre>public&nbsp;boolean&nbsp;returnReservedValues()
                             throws <a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a>,
                                    <a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></pre>
<div class="block">Allow any unused reserved values to be returned for re-use. If the
 repository is shared by other processes, then reserved values might not
 be returnable.

 <p>This method should be called during the shutdown process of a
 repository, although calling it does not invalidate this
 SequenceValueGenerator. If getNextValue is called again, it will reserve
 values again.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if reserved values were returned</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></dd>
<dd><code><a href="../../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></dd></dl>
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