cayenne-server/src/main/java/org/apache/cayenne/tx/TransactionFilter.java

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 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.tx;

import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.DataChannel;
import org.apache.cayenne.DataChannelSyncCallbackAction;
import org.apache.cayenne.DataChannelSyncFilter;
import org.apache.cayenne.DataChannelSyncFilterChain;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.graph.GraphDiff;

/**
 * A {@link DataChannelSyncFilter} that provides transactions.
 *
 * @since 4.0
 */
public class TransactionFilter implements DataChannelSyncFilter {

    @Inject
    protected TransactionManager transactionManager;

    @Override
    public GraphDiff onSync(ObjectContext originatingContext, GraphDiff changes, int syncType, DataChannelSyncFilterChain 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(() -> filterChain.onSync(originatingContext, changes, syncType));
                break;

            default:
                throw new CayenneRuntimeException("Invalid synchronization type: %d", syncType);
        }

        callbackAction.applyPostCommit();
        return result;
    }

}