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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.scxml.invoke;
18  
19  import org.apache.commons.logging.Log;
20  import org.apache.commons.logging.LogFactory;
21  import org.apache.commons.scxml.SCXMLExecutor;
22  import org.apache.commons.scxml.TriggerEvent;
23  import org.apache.commons.scxml.model.ModelException;
24  
25  /***
26   * Trigger the given {@link TriggerEvent} (or array of) on the given
27   * state machine executor asynchronously, once.
28   */
29  class AsyncTrigger implements Runnable {
30  
31      /*** The state machine executor. */
32      private SCXMLExecutor executor;
33      /*** The event(s) to be triggered. */
34      private TriggerEvent[] events;
35      /*** The log. */
36      private Log log = LogFactory.getLog(AsyncTrigger.class);
37  
38      /***
39       * Constructor.
40       *
41       * @param executor The {@link SCXMLExecutor} to trigger the event on.
42       * @param event The {@link TriggerEvent}.
43       */
44      AsyncTrigger(final SCXMLExecutor executor, final TriggerEvent event) {
45          this.executor = executor;
46          this.events = new TriggerEvent[1];
47          this.events[0] = event;
48          new Thread(this).start();
49      }
50  
51      /***
52       * Fire the event(s).
53       */
54      public void run() {
55          try {
56              synchronized (executor) {
57                  executor.triggerEvents(events);
58              }
59          } catch (ModelException me) {
60              log.error(me.getMessage(), me);
61          }
62      }
63  
64  }
65