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* 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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package org.apache.cayenne.tx;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.DataChannel;
import org.apache.cayenne.DataChannelFilter;
import org.apache.cayenne.DataChannelFilterChain;
import org.apache.cayenne.DataChannelSyncCallbackAction;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.QueryResponse;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.graph.GraphDiff;
import org.apache.cayenne.query.Query;
/**
* A {@link DataChannelFilter} that provides transactions.
*
* @since 4.0
*/
public class TransactionFilter implements DataChannelFilter {
@Inject
protected TransactionManager transactionManager;
@Override
public void init(DataChannel channel) {
}
@Override
public QueryResponse onQuery(ObjectContext originatingContext, Query query, DataChannelFilterChain filterChain) {
return filterChain.onQuery(originatingContext, query);
}
@Override
public GraphDiff onSync(final ObjectContext originatingContext, final GraphDiff changes, final int syncType, final DataChannelFilterChain filterChain) {
DataChannelSyncCallbackAction callbackAction = DataChannelSyncCallbackAction.getCallbackAction(
originatingContext.getChannel().getEntityResolver().getCallbackRegistry(),
originatingContext.getGraphManager(),
changes, syncType);
callbackAction.applyPreCommit();
GraphDiff result;
switch (syncType) {
case DataChannel.ROLLBACK_CASCADE_SYNC:
result = filterChain.onSync(originatingContext, changes, syncType);;
break;
// including transaction handling logic
case DataChannel.FLUSH_NOCASCADE_SYNC:
case DataChannel.FLUSH_CASCADE_SYNC:
result = transactionManager.performInTransaction(new TransactionalOperation<GraphDiff>() {
@Override
public GraphDiff perform() {
return filterChain.onSync(originatingContext, changes, syncType);
}
});
break;
default:
throw new CayenneRuntimeException("Invalid synchronization type: %d", syncType);
}
callbackAction.applyPostCommit();
return result;
}
}