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Cayenne Object Persistence Framework
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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****************************************************************/
package org.apache.cayenne.remote;
import org.apache.cayenne.DataChannel;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.graph.GraphDiff;
/**
* A message used for synchronization of the child with parent. It defines a few types of
* synchronization: "flush" (when the child sends its changes without a commit), "commit"
* (cascading flush with ultimate commit to the database), and "rollback" - cascading
* reverting of all uncommitted changes.
*
* @since 1.2
* @author Andrus Adamchik
*/
public class SyncMessage implements ClientMessage {
protected transient ObjectContext source;
protected int type;
protected GraphDiff senderChanges;
// private constructor for Hessian deserialization
private SyncMessage() {
}
public SyncMessage(ObjectContext source, int syncType, GraphDiff senderChanges) {
// validate type
if (syncType != DataChannel.FLUSH_NOCASCADE_SYNC
&& syncType != DataChannel.FLUSH_CASCADE_SYNC
&& syncType != DataChannel.ROLLBACK_CASCADE_SYNC) {
throw new IllegalArgumentException("'type' is invalid: " + syncType);
}
this.source = source;
this.type = syncType;
this.senderChanges = senderChanges;
}
/**
* Returns a source of SyncMessage.
*/
public ObjectContext getSource() {
return source;
}
public int getType() {
return type;
}
public GraphDiff getSenderChanges() {
return senderChanges;
}
public String toString() {
switch (type) {
case DataChannel.FLUSH_NOCASCADE_SYNC:
return "flush-sync";
case DataChannel.FLUSH_CASCADE_SYNC:
return "flush-cascade-sync";
case DataChannel.ROLLBACK_CASCADE_SYNC:
return "rollback-cascade-sync";
default:
return "unknown-sync";
}
}
}
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