releases/latest/javadoc/org/apache/geode/Delta.html - geode-site - Git at Google

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 <h2 title="Interface Delta" class="title">Interface Delta</h2>
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 <dt>All Known Implementing Classes:</dt>
 <dd><a href="../../../org/apache/geode/modules/session/catalina/DeltaSession.html" title="class in org.apache.geode.modules.session.catalina">DeltaSession</a>, <a href="../../../org/apache/geode/modules/session/catalina/DeltaSession7.html" title="class in org.apache.geode.modules.session.catalina">DeltaSession7</a>, <a href="../../../org/apache/geode/modules/session/catalina/DeltaSession8.html" title="class in org.apache.geode.modules.session.catalina">DeltaSession8</a>, <a href="../../../org/apache/geode/modules/session/catalina/DeltaSession9.html" title="class in org.apache.geode.modules.session.catalina">DeltaSession9</a></dd>
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 <pre>public interface <span class="typeNameLabel">Delta</span></pre>
 <div class="block">This interface defines a contract between the application and GemFire that allows GemFire to
  determine whether an application object contains a delta, allows GemFire to extract the delta
  from an application object, and generate a new application object by applying a delta to an
  existing application object. The difference in object state is contained in the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> and <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> parameters.</div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>GemFire 6.1</dd>
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 <th class="colLast" scope="col">Method and Description</th>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#fromDelta-java.io.DataInput-">fromDelta</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)</code>
 <div class="block">This method is invoked on an existing application object when an update is received as a delta.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>default boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#getForceRecalculateSize--">getForceRecalculateSize</a></span>()</code>
 <div class="block">By default, entry sizes are not recalculated when deltas are applied.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#hasDelta--">hasDelta</a></span>()</code>
 <div class="block">Returns true if this object has pending changes it can write out as a delta.</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/geode/Delta.html#toDelta-java.io.DataOutput-">toDelta</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)</code>
 <div class="block">This method is invoked on an application object at the delta sender, if GemFire determines the
  presence of a delta by calling <a href="../../../org/apache/geode/Delta.html#hasDelta--"><code>hasDelta()</code></a> on the object.</div>
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 <pre>boolean&nbsp;hasDelta()</pre>
 <div class="block">Returns true if this object has pending changes it can write out as a delta. Returns false if
  this object must be transmitted in its entirety.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>whether this object has pending changes it can write out as a delta</dd>
 </dl>
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 <pre>void&nbsp;toDelta(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)
       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">This method is invoked on an application object at the delta sender, if GemFire determines the
  presence of a delta by calling <a href="../../../org/apache/geode/Delta.html#hasDelta--"><code>hasDelta()</code></a> on the object. The delta is written to
  the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> object provided by GemFire.

  <p>
  Any delta state should be reset in this method.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>out</code> - the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> to write to</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> - if a problem occurs while writing to <code>out</code></dd>
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 <h4>fromDelta</h4>
 <pre>void&nbsp;fromDelta(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)
         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>,
                <a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode">InvalidDeltaException</a></pre>
 <div class="block">This method is invoked on an existing application object when an update is received as a delta.
  This method throws an <a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode"><code>InvalidDeltaException</code></a> when the delta in the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a>
  cannot be applied to the object. GemFire automatically handles an <a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode"><code>InvalidDeltaException</code></a>
  by reattempting the update by sending the full application object.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>in</code> - the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> to read 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> - if a problem occurs while reading from <code>in</code></dd>
 <dd><code><a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode">InvalidDeltaException</a></code></dd>
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 <h4>getForceRecalculateSize</h4>
 <pre>default&nbsp;boolean&nbsp;getForceRecalculateSize()</pre>
 <div class="block">By default, entry sizes are not recalculated when deltas are applied. This optimizes for the
  case where the size of an entry does not change. However, if an entry size does increase or
  decrease, this default behavior can result in the memory usage statistics becoming inaccurate.
  These are used to monitor the health of Geode instances, and for balancing memory usage across
  partitioned regions.

  <p>
  There is a system property, gemfire.DELTAS_RECALCULATE_SIZE, which can be used to cause all
  deltas to trigger entry size recalculation when deltas are applied. By default, this is set
  to 'false' because of potential performance impacts when every delta triggers a recalculation.

  <p>
  To allow entry size recalculation on a per-delta basis, classes that extend the Delta interface
  should override this method to return 'true'. This may impact performance of specific delta
  types, but will not globally affect the performance of other Geode delta operations.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>whether entry sizes should be recalculated when deltas are applied</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>1.14</dd>
 </dl>
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	<h2 title="Interface Delta" class="title">Interface Delta</h2>
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	<pre>public interface <span class="typeNameLabel">Delta</span></pre>
	<div class="block">This interface defines a contract between the application and GemFire that allows GemFire to
	determine whether an application object contains a delta, allows GemFire to extract the delta
	from an application object, and generate a new application object by applying a delta to an
	existing application object. The difference in object state is contained in the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> and <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> parameters.</div>
	<dl>
	<dt><span class="simpleTagLabel">Since:</span></dt>
	<dd>GemFire 6.1</dd>
	</dl>
	</li>
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	<td class="colFirst"><code>void</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#fromDelta-java.io.DataInput-">fromDelta</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in)</code>
	<div class="block">This method is invoked on an existing application object when an update is received as a delta.</div>
	</td>
	</tr>
	<tr id="i1" class="rowColor">
	<td class="colFirst"><code>default boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#getForceRecalculateSize--">getForceRecalculateSize</a></span>()</code>
	<div class="block">By default, entry sizes are not recalculated when deltas are applied.</div>
	</td>
	</tr>
	<tr id="i2" class="altColor">
	<td class="colFirst"><code>boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#hasDelta--">hasDelta</a></span>()</code>
	<div class="block">Returns true if this object has pending changes it can write out as a delta.</div>
	</td>
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	<tr id="i3" class="rowColor">
	<td class="colFirst"><code>void</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/geode/Delta.html#toDelta-java.io.DataOutput-">toDelta</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)</code>
	<div class="block">This method is invoked on an application object at the delta sender, if GemFire determines the
	presence of a delta by calling <a href="../../../org/apache/geode/Delta.html#hasDelta--"><code>hasDelta()</code></a> on the object.</div>
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	<h3>Method Detail</h3>
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	<h4>hasDelta</h4>
	<pre>boolean hasDelta()</pre>
	<div class="block">Returns true if this object has pending changes it can write out as a delta. Returns false if
	this object must be transmitted in its entirety.</div>
	<dl>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>whether this object has pending changes it can write out as a delta</dd>
	</dl>
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	<h4>toDelta</h4>
	<pre>void toDelta(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)
	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">This method is invoked on an application object at the delta sender, if GemFire determines the
	presence of a delta by calling <a href="../../../org/apache/geode/Delta.html#hasDelta--"><code>hasDelta()</code></a> on the object. The delta is written to
	the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> object provided by GemFire.

	<p>
	Any delta state should be reset in this method.</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>out</code> - the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> to write to</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> - if a problem occurs while writing to <code>out</code></dd>
	</dl>
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	<h4>fromDelta</h4>
	<pre>void fromDelta(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in)
	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>,
	<a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode">InvalidDeltaException</a></pre>
	<div class="block">This method is invoked on an existing application object when an update is received as a delta.
	This method throws an <a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode"><code>InvalidDeltaException</code></a> when the delta in the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a>
	cannot be applied to the object. GemFire automatically handles an <a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode"><code>InvalidDeltaException</code></a>
	by reattempting the update by sending the full application object.</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>in</code> - the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> to read 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> - if a problem occurs while reading from <code>in</code></dd>
	<dd><code><a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode">InvalidDeltaException</a></code></dd>
	</dl>
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	<h4>getForceRecalculateSize</h4>
	<pre>default boolean getForceRecalculateSize()</pre>
	<div class="block">By default, entry sizes are not recalculated when deltas are applied. This optimizes for the
	case where the size of an entry does not change. However, if an entry size does increase or
	decrease, this default behavior can result in the memory usage statistics becoming inaccurate.
	These are used to monitor the health of Geode instances, and for balancing memory usage across
	partitioned regions.

	<p>
	There is a system property, gemfire.DELTAS_RECALCULATE_SIZE, which can be used to cause all
	deltas to trigger entry size recalculation when deltas are applied. By default, this is set
	to 'false' because of potential performance impacts when every delta triggers a recalculation.

	<p>
	To allow entry size recalculation on a per-delta basis, classes that extend the Delta interface
	should override this method to return 'true'. This may impact performance of specific delta
	types, but will not globally affect the performance of other Geode delta operations.</div>
	<dl>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>whether entry sizes should be recalculated when deltas are applied</dd>
	<dt><span class="simpleTagLabel">Since:</span></dt>
	<dd>1.14</dd>
	</dl>
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