Add simpleframework source files

Change-Id: I18d01df16de2868ca5458f79a88e6070b75db2c3
(cherry picked from commit 3e9f84cf7b22f6970eb8041ca38d12d75c6bb270)

1 files changed, 109 insertions, 0 deletions

diff --git a/simple/simple-common/src/main/java/org/simpleframework/common/thread/ConcurrentExecutor.java b/simple/simple-common/src/main/java/org/simpleframework/common/thread/ConcurrentExecutor.java
new file mode 100644
index 0000000..9f99025
--- /dev/null
+++ b/simple/simple-common/src/main/java/org/simpleframework/common/thread/ConcurrentExecutor.java
@@ -0,0 +1,109 @@
+/*
+ * ConcurrentExecutor.java February 2007
+ *
+ * Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
+ *
+ * Licensed 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.simpleframework.common.thread;
+
+import java.util.concurrent.Executor;
+
+/**
+ * The <code>ConcurrentExecutor</code> object is used to execute tasks
+ * in a thread pool. This creates a thread pool with an unbounded list
+ * of outstanding tasks, which ensures that any system requesting
+ * a task to be executed will not block when handing it over.
+ * 
+ * @author Niall Gallagher
+ */
+public class ConcurrentExecutor implements Executor {
+   
+   /**
+    * This is the queue used to enqueue the tasks for execution.
+    */
+   private final ExecutorQueue queue;
+   
+   /**
+    * Constructor for the <code>ConcurrentExecutor</code> object. This 
+    * is used to create a pool of threads that can be used to execute
+    * arbitrary <code>Runnable</code> tasks. If the threads are
+    * busy this will simply enqueue the tasks and return.
+    * 
+    * @param type this is the type of runnable that this accepts
+    */
+   public ConcurrentExecutor(Class type) {
+      this(type, 10);
+   }
+   
+   /**
+    * Constructor for the <code>ConcurrentExecutor</code> object. This 
+    * is used to create a pool of threads that can be used to execute
+    * arbitrary <code>Runnable</code> tasks. If the threads are
+    * busy this will simply enqueue the tasks and return.
+    * 
+    * @param type this is the type of runnable that this accepts
+    * @param size this is the number of threads to use in the pool
+    */   
+   public ConcurrentExecutor(Class type, int size) {
+      this(type, size, size);
+   }
+   
+   /**
+    * Constructor for the <code>ConcurrentExecutor</code> object. This 
+    * is used to create a pool of threads that can be used to execute
+    * arbitrary <code>Runnable</code> tasks. If the threads are
+    * busy this will simply enqueue the tasks and return.
+    * 
+    * @param type this is the type of runnable that this accepts
+    * @param rest this is the number of threads to use in the pool    
+    * @param active this is the maximum size the pool can grow to 
+    */   
+   public ConcurrentExecutor(Class type, int rest, int active) {     
+      this.queue = new ExecutorQueue(type, rest, active);
+   }   
+   
+   /**
+    * The <code>execute</code> method is used to queue the task for
+    * execution. If all threads are busy the provided task is queued
+    * and waits until all current and outstanding tasks are finished.
+    * 
+    * @param task this is the task to be queued for execution
+    */
+   public void execute(Runnable task) {
+      queue.execute(task);
+   }   
+   
+   /**
+    * This is used to stop the executor by interrupting all running
+    * tasks and shutting down the threads within the pool. This will
+    * return once it has been stopped, and no further tasks will be 
+    * accepted by this pool for execution.
+    */   
+   public void stop() {
+      stop(60000);
+   }   
+   
+   /**
+    * This is used to stop the executor by interrupting all running
+    * tasks and shutting down the threads within the pool. This will
+    * return once it has been stopped, and no further tasks will be 
+    * accepted by this pool for execution.
+    *
+    * @param wait the number of milliseconds to wait for it to stop 
+    */   
+   public void stop(long wait) {
+      queue.stop(wait);
+   }
+}