_br-ode-1.X.svn/bpel-runtime/src/main/java/org/apache/ode/bpel/runtime/ORDEREDCOMPENSATOR.java

/*
 * 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
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.ode.bpel.runtime;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ode.jacob.SynchChannel;
import org.apache.ode.jacob.SynchChannelListener;

import java.util.List;

/**
 * Serially activates a list of compensations in order.
 */
class ORDEREDCOMPENSATOR extends BpelJacobRunnable  {
  private static final long serialVersionUID = -3181661355085428370L;

  private static final Log __log = LogFactory.getLog(ORDEREDCOMPENSATOR.class);

  private List<CompensationHandler> _compensations;
  private SynchChannel _ret;

  public ORDEREDCOMPENSATOR(List<CompensationHandler> compensations, SynchChannel ret) {
    _compensations = compensations;
    _ret = ret;
  }

  public void run() {
    if (_compensations.isEmpty()) {
      _ret.ret();
    }
    else {
      SynchChannel r = newChannel(SynchChannel.class);
      CompensationHandler cdata = _compensations.remove(0);
      cdata.compChannel.compensate(r);
      object(new SynchChannelListener(r) {
        private static final long serialVersionUID = 7173916663479205420L;

        public void ret() {
          instance(ORDEREDCOMPENSATOR.this);
        }
      });
    }

  }

  protected Log log() {
    return __log;
  }

  public String toString() {
    return new StringBuffer("ORDEREDCOMPENSATOR(comps=")
            .append(_compensations)
            .append(")")
            .toString();
  }

}