/*
 *    Copyright 2012 Jason Miller
 *
 * 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 jj.execution;

import java.time.Clock;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.TimeUnit;
import javax.inject.Inject;
import javax.inject.Singleton;

import jj.ServerStopping;
import jj.event.Listener;
import jj.event.Subscriber;

/**
 * Special internal executor for the various tasks the server needs done.
 * 
 * @author jason
 *
 */
@Singleton
@Subscriber
class ServerExecutor extends DelayedExecutor {

	@Inject
	ServerExecutor(
		Clock clock,
		JJThreadFactory threadFactory,
		JJRejectedExecutionHandler handler
	) {
		super(
			clock,
			2, // core threads, which we will always keep alive.  effectively one since the first thing we do is start a scheduler
			Integer.MAX_VALUE, // never run out of threads for server tasks until we exhaust the machine
			20, TimeUnit.SECONDS, // don't keep threads around too long if they aren't kept busy.  
			new SynchronousQueue<Runnable>(), // hand off tasks immediately for execution
			threadFactory.namePattern("JibbrJabbr Server Thread %d"),
			handler
		);
	}
	
	@Override
	protected String schedulerThreadName() {
		return Thread.currentThread().getName() + " - " + toString() + " Scheduler";
	}

	@Listener
	public void on(ServerStopping event) {
		shutdownNow();
	}
	
	@Override
	public String toString() {
		return getClass().getSimpleName();
	}

	/**
	 * @return
	 */
	boolean isServerThread() {
		return threadFactory.in();
	}
	
}