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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.scxml2.invoke;
18  
19  import org.apache.commons.scxml2.SCXMLIOProcessor;
20  import org.apache.commons.scxml2.TriggerEvent;
21  
22  /**
23   * Trigger the given {@link TriggerEvent} on the given
24   * state machine executor asynchronously, once.
25   */
26  class AsyncTrigger implements Runnable {
27  
28      /** The SCXML state machine I/O Processor to deliver the event to. */
29      private final SCXMLIOProcessor ioProcessor;
30      /** The event to be triggered. */
31      private final TriggerEvent event;
32  
33      /**
34       * Constructor.
35       *
36       * @param ioProcessor The {@link org.apache.commons.scxml2.SCXMLIOProcessor} to trigger the event on.
37       * @param event The {@link TriggerEvent}.
38       */
39      AsyncTrigger(final SCXMLIOProcessor ioProcessor, final TriggerEvent event) {
40          this.ioProcessor = ioProcessor;
41          this.event = event;
42      }
43  
44      /**
45       * Fire the trigger asynchronously.
46       */
47      public void start() {
48          new Thread(this).start();
49      }
50  
51      /**
52       * Fire the event(s).
53       */
54      public void run() {
55          ioProcessor.addEvent(event);
56      }
57  
58  }
59