src/main/site/static/docs/4.2/api/org/apache/cayenne/DataChannelSyncFilter.html - cayenne-website - Git at Google

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 <h2 title="Interface DataChannelSyncFilter" class="title">Interface DataChannelSyncFilter</h2>
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 <dt>All Known Subinterfaces:</dt>
 <dd><code><a href="DataChannelFilter.html" title="interface in org.apache.cayenne">DataChannelFilter</a></code></dd>
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 <dt>All Known Implementing Classes:</dt>
 <dd><code><a href="tx/TransactionFilter.html" title="class in org.apache.cayenne.tx">TransactionFilter</a></code></dd>
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 <dt>Functional Interface:</dt>
 <dd>This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.</dd>
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 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/FunctionalInterface.html?is-external=true" title="class or interface in java.lang" class="externalLink">@FunctionalInterface</a>
 public interface <span class="typeNameLabel">DataChannelSyncFilter</span></pre>
 <div class="block">An interface of a filter that allows to intercept DataChannel sync operations.
  Sync filters allow to implement chains of custom processors around a DataChannel.
  <p>
  Example: <pre><code>
  public class MySyncFilter implements DataChannelSyncFilter {
      public GraphDiff onSync(ObjectContext originatingContext,
                              GraphDiff changes,
                              int syncType,
                              DataChannelSyncFilterChain filterChain) {
          System.out.println("Do something before sync");
          // process changes or return some custom diff
          GraphDiff diff = filterChain.onSync(originatingContext, changes, syncType);
          System.out.println("Do something after sync");
          return diff;
      }
  }</code></pre></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>4.1</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="DataChannelQueryFilter.html" title="interface in org.apache.cayenne"><code>DataChannelQueryFilter</code></a>,
 <a href="configuration/server/ServerModule.html#contributeDomainSyncFilters(org.apache.cayenne.di.Binder)"><code>ServerModule.contributeDomainSyncFilters(org.apache.cayenne.di.Binder)</code></a></dd>
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 <td class="colFirst"><code><a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onSync(org.apache.cayenne.ObjectContext,org.apache.cayenne.graph.GraphDiff,int,org.apache.cayenne.DataChannelSyncFilterChain)">onSync</a></span>&#8203;(<a href="ObjectContext.html" title="interface in org.apache.cayenne">ObjectContext</a>&nbsp;originatingContext,
       <a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a>&nbsp;changes,
       int&nbsp;syncType,
       <a href="DataChannelSyncFilterChain.html" title="interface in org.apache.cayenne">DataChannelSyncFilterChain</a>&nbsp;filterChain)</code></th>
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 <h4>onSync</h4>
 <pre class="methodSignature"><a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a>&nbsp;onSync&#8203;(<a href="ObjectContext.html" title="interface in org.apache.cayenne">ObjectContext</a>&nbsp;originatingContext,
                  <a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a>&nbsp;changes,
                  int&nbsp;syncType,
                  <a href="DataChannelSyncFilterChain.html" title="interface in org.apache.cayenne">DataChannelSyncFilterChain</a>&nbsp;filterChain)</pre>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>originatingContext</code> - originating context of changes</dd>
 <dd><code>changes</code> - diff that is being processed</dd>
 <dd><code>syncType</code> - type of sync; possible values: <a href="DataChannel.html#FLUSH_NOCASCADE_SYNC"><code>DataChannel.FLUSH_NOCASCADE_SYNC</code></a>,
                  <a href="DataChannel.html#FLUSH_CASCADE_SYNC"><code>DataChannel.FLUSH_CASCADE_SYNC</code></a>,
                  <a href="DataChannel.html#ROLLBACK_CASCADE_SYNC"><code>DataChannel.ROLLBACK_CASCADE_SYNC</code></a></dd>
 <dd><code>filterChain</code> - chain of sync filters to invoke after this filter</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>final context diff</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="DataChannel.html#FLUSH_NOCASCADE_SYNC"><code>DataChannel.FLUSH_NOCASCADE_SYNC</code></a>,
 <a href="DataChannel.html#FLUSH_CASCADE_SYNC"><code>DataChannel.FLUSH_CASCADE_SYNC</code></a>,
 <a href="DataChannel.html#ROLLBACK_CASCADE_SYNC"><code>DataChannel.ROLLBACK_CASCADE_SYNC</code></a></dd>
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	<h2 title="Interface DataChannelSyncFilter" class="title">Interface DataChannelSyncFilter</h2>
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	<dt>All Known Subinterfaces:</dt>
	<dd><code><a href="DataChannelFilter.html" title="interface in org.apache.cayenne">DataChannelFilter</a></code></dd>
	</dl>
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	<dt>All Known Implementing Classes:</dt>
	<dd><code><a href="tx/TransactionFilter.html" title="class in org.apache.cayenne.tx">TransactionFilter</a></code></dd>
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	<dt>Functional Interface:</dt>
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	<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/FunctionalInterface.html?is-external=true" title="class or interface in java.lang" class="externalLink">@FunctionalInterface</a>
	public interface <span class="typeNameLabel">DataChannelSyncFilter</span></pre>
	<div class="block">An interface of a filter that allows to intercept DataChannel sync operations.
	Sync filters allow to implement chains of custom processors around a DataChannel.
	<p>
	Example: <pre><code>
	public class MySyncFilter implements DataChannelSyncFilter {
	public GraphDiff onSync(ObjectContext originatingContext,
	GraphDiff changes,
	int syncType,
	DataChannelSyncFilterChain filterChain) {
	System.out.println("Do something before sync");
	// process changes or return some custom diff
	GraphDiff diff = filterChain.onSync(originatingContext, changes, syncType);
	System.out.println("Do something after sync");
	return diff;
	}
	}</code></pre></div>
	<dl>
	<dt><span class="simpleTagLabel">Since:</span></dt>
	<dd>4.1</dd>
	<dt><span class="seeLabel">See Also:</span></dt>
	<dd><a href="DataChannelQueryFilter.html" title="interface in org.apache.cayenne"><code>DataChannelQueryFilter</code></a>,
	<a href="configuration/server/ServerModule.html#contributeDomainSyncFilters(org.apache.cayenne.di.Binder)"><code>ServerModule.contributeDomainSyncFilters(org.apache.cayenne.di.Binder)</code></a></dd>
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	<th class="colFirst" scope="col">Modifier and Type</th>
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	<tr id="i0" class="altColor">
	<td class="colFirst"><code><a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a></code></td>
	<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onSync(org.apache.cayenne.ObjectContext,org.apache.cayenne.graph.GraphDiff,int,org.apache.cayenne.DataChannelSyncFilterChain)">onSync</a></span>(<a href="ObjectContext.html" title="interface in org.apache.cayenne">ObjectContext</a> originatingContext,
	<a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a> changes,
	int syncType,
	<a href="DataChannelSyncFilterChain.html" title="interface in org.apache.cayenne">DataChannelSyncFilterChain</a> filterChain)</code></th>
	<td class="colLast"> </td>
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	<a id="onSync(org.apache.cayenne.ObjectContext,org.apache.cayenne.graph.GraphDiff,int,org.apache.cayenne.DataChannelSyncFilterChain)">
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	<h4>onSync</h4>
	<pre class="methodSignature"><a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a> onSync(<a href="ObjectContext.html" title="interface in org.apache.cayenne">ObjectContext</a> originatingContext,
	<a href="graph/GraphDiff.html" title="interface in org.apache.cayenne.graph">GraphDiff</a> changes,
	int syncType,
	<a href="DataChannelSyncFilterChain.html" title="interface in org.apache.cayenne">DataChannelSyncFilterChain</a> filterChain)</pre>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>originatingContext</code> - originating context of changes</dd>
	<dd><code>changes</code> - diff that is being processed</dd>
	<dd><code>syncType</code> - type of sync; possible values: <a href="DataChannel.html#FLUSH_NOCASCADE_SYNC"><code>DataChannel.FLUSH_NOCASCADE_SYNC</code></a>,
	<a href="DataChannel.html#FLUSH_CASCADE_SYNC"><code>DataChannel.FLUSH_CASCADE_SYNC</code></a>,
	<a href="DataChannel.html#ROLLBACK_CASCADE_SYNC"><code>DataChannel.ROLLBACK_CASCADE_SYNC</code></a></dd>
	<dd><code>filterChain</code> - chain of sync filters to invoke after this filter</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>final context diff</dd>
	<dt><span class="seeLabel">See Also:</span></dt>
	<dd><a href="DataChannel.html#FLUSH_NOCASCADE_SYNC"><code>DataChannel.FLUSH_NOCASCADE_SYNC</code></a>,
	<a href="DataChannel.html#FLUSH_CASCADE_SYNC"><code>DataChannel.FLUSH_CASCADE_SYNC</code></a>,
	<a href="DataChannel.html#ROLLBACK_CASCADE_SYNC"><code>DataChannel.ROLLBACK_CASCADE_SYNC</code></a></dd>
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