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+/*
+ * Copyright (c) 2005, Eric Crahen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __ZTEXECUTOR_H__
+#define __ZTEXECUTOR_H__
+
+#include "zthread/Thread.h"
+#include "zthread/Waitable.h"
+
+namespace ZThread {
+
+ 
+  /**
+   * @class Executor
+   *
+   * @author Eric Crahen <http://www.code-foo.com>
+   * @date <2003-07-16T22:39:39-0400>
+   * @version 2.3.0
+   *
+   * Execeutors are an implementation of the Executor pattern. This is
+   * a more versatile construct than a thread pool. A paper describing can
+   * be found in the proceedings of the 2002 VikingPLOP conference.
+   *
+   * <b>Executing</b>
+   * 
+   * - <em>execute</em>()ing task with an Executor will submit the task, scheduling
+   *   it for execution at some future time depending on the Executor being used.
+   *
+   * <b>Disabling</b>
+   *
+   * - <em>cancel</em>()ing an Executor will cause it to stop accepting 
+   *   new tasks. 
+   *
+   * <b>Interrupting</b>
+   *
+   * - <em>interrupt</em>()ing an Executor will cause the any thread running 
+   *   a task which was submitted prior to the invocation of this function to 
+   *   be interrupted during the execution of that task.
+   *
+   * <b>Waiting</b>
+   *
+   * - <em>wait</em>()ing on a PoolExecutor will block the calling thread 
+   *   until all tasks that were submitted prior to the invocation of this function
+   *   have completed.
+   * 
+   * @see Cancelable
+   * @see Waitable
+   */
+  class Executor : public Cancelable, public Waitable, private NonCopyable {
+  public:
+
+    /**
+     * If supported by the Executor, interrupt all tasks submitted prior to 
+     * the invocation of this function.
+     */    
+    virtual void interrupt() = 0;
+
+    /**
+     * Submit a task to this Executor. 
+     *
+     * @param task Task to be run by a thread managed by this executor 
+     *
+     * @pre  The Executor should have been canceled prior to this invocation.
+     * @post The submitted task will be run at some point in the future by this Executor.
+     *
+     * @exception Cancellation_Exception thrown if the Executor was canceled prior to
+     *            the invocation of this function.
+     */
+    virtual void execute(const Task& task) = 0;
+  
+  };
+
+} // namespace ZThread
+
+#endif // __ZTEXECUTOR_H__