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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> |
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| <dd>GemFire 6.1</dd> |
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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> |
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| <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="i2" class="altColor"> |
| <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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| <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> |
| </li> |
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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. |
| |
| Any delta state should be reset in this method.</div> |
| <dl> |
| <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></dd> |
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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="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></dd> |
| <dd><code><a href="../../../org/apache/geode/InvalidDeltaException.html" title="class in org.apache.geode">InvalidDeltaException</a></code></dd> |
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