--- /dev/null
+//
+// ========================================================================
+// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+// ------------------------------------------------------------------------
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the Eclipse Public License v1.0
+// and Apache License v2.0 which accompanies this distribution.
+//
+// The Eclipse Public License is available at
+// http://www.eclipse.org/legal/epl-v10.html
+//
+// The Apache License v2.0 is available at
+// http://www.opensource.org/licenses/apache2.0.php
+//
+// You may elect to redistribute this code under either of these licenses.
+// ========================================================================
+//
+
+package org.eclipse.jetty.util.thread;
+
+import java.util.concurrent.Executor;
+
+import org.eclipse.jetty.util.annotation.ManagedAttribute;
+import org.eclipse.jetty.util.annotation.ManagedObject;
+import org.eclipse.jetty.util.component.LifeCycle;
+
+/* ------------------------------------------------------------ */
+/** ThreadPool.
+ *
+ * A specialization of Executor interface that provides reporting methods (eg {@link #getThreads()})
+ * and the option of configuration methods (e.g. @link {@link SizedThreadPool#setMaxThreads(int)}).
+ *
+ */
+@ManagedObject("Pool of Threads")
+public interface ThreadPool extends Executor
+{
+ /* ------------------------------------------------------------ */
+ /**
+ * Blocks until the thread pool is {@link LifeCycle#stop stopped}.
+ */
+ public void join() throws InterruptedException;
+
+ /* ------------------------------------------------------------ */
+ /**
+ * @return The total number of threads currently in the pool
+ */
+ @ManagedAttribute("number of threads in pool")
+ public int getThreads();
+
+ /* ------------------------------------------------------------ */
+ /**
+ * @return The number of idle threads in the pool
+ */
+ @ManagedAttribute("number of idle threads in pool")
+ public int getIdleThreads();
+
+ /* ------------------------------------------------------------ */
+ /**
+ * @return True if the pool is low on threads
+ */
+ @ManagedAttribute("indicates the pool is low on available threads")
+ public boolean isLowOnThreads();
+
+
+ /* ------------------------------------------------------------ */
+ /* ------------------------------------------------------------ */
+ public interface SizedThreadPool extends ThreadPool
+ {
+ public int getMinThreads();
+ public int getMaxThreads();
+ public void setMinThreads(int threads);
+ public void setMaxThreads(int threads);
+ }
+}