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| <h2 title="Interface DistributionPolicy" class="title">Interface DistributionPolicy</h2> |
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| <pre>public interface <span class="strong">DistributionPolicy</span></pre> |
| <div class="block">Policy to select one of the physical databases referred as <em>slice</em> |
| in which a given persistent instance will be stored. |
| |
| The user application is required to implement this interface. Slice will |
| invoke the single method of this interface to determine the target slice for |
| a newly persistent or a detached instance being merged.</div> |
| <dl><dt><span class="strong">Author:</span></dt> |
| <dd>Pinaki Poddar</dd></dl> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/slice/DistributionPolicy.Default.html" title="class in org.apache.openjpa.slice">DistributionPolicy.Default</a></strong></code> |
| <div class="block">Implements a default distribution policy to store the given |
| instance to a randomly selected available slice.</div> |
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| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/slice/DistributionPolicy.html#distribute(java.lang.Object,%20java.util.List,%20java.lang.Object)">distribute</a></strong>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> pc, |
| <a href="http://docs.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> slices, |
| <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> context)</code> |
| <div class="block">Gets the name of the target slice where the given newly persistent or |
| the detached, to-be-merged instance will be stored.</div> |
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| <h4>distribute</h4> |
| <pre><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> distribute(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> pc, |
| <a href="http://docs.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> slices, |
| <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> context)</pre> |
| <div class="block">Gets the name of the target slice where the given newly persistent or |
| the detached, to-be-merged instance will be stored. |
| <br> |
| If the current state of the given instance is sufficient to determine |
| the target slice, return null. In that case, the runtime will callback |
| this method again before the instance being flushed to the datastore. |
| By then, the policy <em>must</em> be able to determine the target slice.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>pc</code> - The newly persistent or to-be-merged object.</dd><dd><code>slices</code> - list of names of the active slices. The ordering of |
| the list is either explicit <code>openjpa.slice.Names</code> property |
| or implicit i.e. alphabetic order of available identifiers if |
| <code>openjpa.slice.Names</code> is unspecified.</dd><dd><code>context</code> - the generic persistence context managing the given |
| instance.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>identifier of the slice. This name must match one of the |
| given slice names.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/openjpa/slice/DistributedConfiguration.html#getActiveSliceNames()"><code>DistributedConfiguration.getActiveSliceNames()</code></a></dd></dl> |
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