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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// 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 java.util.concurrent.RejectedExecutionException;

/**
 *  A variation of Executor that can confirm if a thread is available immediately
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public interface TryExecutor extends Executor {

    /**
     * Attempt to execute a task.
     *
     * @param task The task to be executed
     * @return True IFF the task has been given directly to a thread to execute.  The task cannot be queued pending the later availability of a Thread.
     */
    boolean tryExecute(Runnable task);

    @Override
    default void execute(Runnable task) {
        if (!tryExecute(task))
            throw new RejectedExecutionException();
    }

    static TryExecutor asTryExecutor(Executor executor) {
        if (executor instanceof TryExecutor)
            return (TryExecutor) executor;
        return new NoTryExecutor(executor);
    }

    // @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
    @Deprecated(since = "2021-05-27")
    class NoTryExecutor implements TryExecutor {

        private final Executor executor;

        public NoTryExecutor(Executor executor) {
            this.executor = executor;
        }

        @Override
        public void execute(Runnable task) {
            executor.execute(task);
        }

        @Override
        public boolean tryExecute(Runnable task) {
            return false;
        }

        @Override
        public String toString() {
            return String.format("%s@%x[%s]", getClass().getSimpleName(), hashCode(), executor);
        }
    }

    TryExecutor NO_TRY = new TryExecutor() {

        @Override
        public boolean tryExecute(Runnable task) {
            return false;
        }

        @Override
        public String toString() {
            return "NO_TRY";
        }
    };
}