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    1   /*
    2    *
    3    *   Copyright 2006 The Apache Software Foundation.
    4    *
    5    *  Licensed under the Apache License, Version 2.0 (the "License");
    6    *  you may not use this file except in compliance with the License.
    7    *  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   */
    18  package org.apache.commons.scxml.invoke;
    19
    20  import org.apache.commons.logging.Log;
    21  import org.apache.commons.logging.LogFactory;
    22  import org.apache.commons.scxml.SCXMLExecutor;
    23  import org.apache.commons.scxml.TriggerEvent;
    24  import org.apache.commons.scxml.model.ModelException;
    25
    26  /***
    27   * Trigger the given {@link TriggerEvent} (or array of) on the given
    28   * state machine executor asynchronously, once.
    29   */
    30  class AsyncTrigger implements Runnable {
    31
    32      /*** The state machine executor. */
    33      private SCXMLExecutor executor;
    34      /*** The event(s) to be triggered. */
    35      private TriggerEvent[] events;
    36      /*** The log. */
    37      private Log log = LogFactory.getLog(AsyncTrigger.class);
    38
    39      /***
    40       * Constructor.
    41       *
    42       * @param executor The {@link SCXMLExecutor} to trigger the event on.
    43       * @param event The {@link TriggerEvent}.
    44       */
    45      AsyncTrigger(final SCXMLExecutor executor, final TriggerEvent event) {
    46          this.executor = executor;
    47          this.events = new TriggerEvent[1];
    48          this.events[0] = event;
    49          new Thread(this).start();
    50      }
    51
    52      /***
    53       * Fire the event(s).
    54       */
    55      public void run() {
    56          try {
    57              synchronized (executor) {
    58                  executor.triggerEvents(events);
    59              }
    60          } catch (ModelException me) {
    61              log.error(me.getMessage(), me);
    62          }
    63      }
    64
    65  }
    66