/*
* 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.jacob.examples.sequence;
import org.apache.ode.jacob.JacobRunnable;
import org.apache.ode.jacob.SynchChannel;
import org.apache.ode.jacob.SynchChannelListener;
/**
* Abstract process that executes a number of steps sequentially.
*/
public abstract class Sequence extends JacobRunnable {
private int _steps;
private int _current;
private SynchChannel _done;
/**
* Create a {@link Sequence} with a number of steps.
*
* @param steps number of steps
* @param done synchronous callback
*/
public Sequence(int steps, SynchChannel done) {
_steps = steps;
_current = 0;
_done = done;
}
/**
* Process execution block
*/
public void run() {
if (_current >= _steps) {
if (_done != null) {
_done.ret();
}
} else {
SynchChannel r = newChannel(SynchChannel.class);
object(new SynchChannelListener(r) {
private static final long serialVersionUID = -6999108928780639603L;
public void ret() {
++_current;
instance(Sequence.this);
}
});
instance(doStep(_current, r));
}
}
/**
* Execute a step
* @param step step number
* @param done notification after step completion
* @return runnable process
*/
protected abstract JacobRunnable doStep(int step, SynchChannel done);
}