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/*  Copyright 1999 Vince Via [email protected]
    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 com.viaoa.object;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Creates and removes Triggers, by setting up in OAObjectInfo.
 *
 * @author vvia
 */
public class OATriggerDelegate {

	public static OATrigger createTrigger(
			String name,
			Class rootClass,
			OATriggerListener triggerListener,
			String[] dependentPropertyPaths,
			final boolean bOnlyUseLoadedData,
			final boolean bServerSideOnly,
			final boolean bBackgroundThread,
			final boolean bBackgroundThreadIfNeeded) {
		OATrigger t = new OATrigger(name, rootClass, triggerListener, dependentPropertyPaths, bOnlyUseLoadedData, bServerSideOnly,
				bBackgroundThread, bBackgroundThreadIfNeeded);

		createTrigger(t);
		return t;
	}

	public static void createTrigger(OATrigger trigger) {
		createTrigger(trigger, false);
	}

	/**
	 * @param bSkipFirstNonManyProperty if true, then if the first prop of the propertyPath is not Type=many, then it will not be used. This
	 *                                  is used when there is a HubListener already listening to the objects.
	 */
	public static void createTrigger(OATrigger trigger, boolean bSkipFirstNonManyProperty) {
		if (trigger == null) {
			return;
		}
		OAObjectInfo oi = OAObjectInfoDelegate.getOAObjectInfo(trigger.rootClass);
		oi.createTrigger(trigger, bSkipFirstNonManyProperty);
	}

	public static boolean removeTrigger(OATrigger trigger) {
		if (trigger == null) {
			return false;
		}

		OAObjectInfo oi = OAObjectInfoDelegate.getOAObjectInfo(trigger.rootClass);
		oi.removeTrigger(trigger);

		return true;
	}

	protected static class TriggerRunnable implements Runnable {
		Runnable runnable;
		boolean bIsLoading;
		public Object context;

		public TriggerRunnable(Runnable runnable) {
			this.runnable = runnable;
			this.bIsLoading = OAThreadLocalDelegate.isLoading();
			this.context = OAThreadLocalDelegate.getContext();
		}

		@Override
		public void run() {
			try {
				OAThreadLocalDelegate.setContext(context);
				if (bIsLoading) {
					OAThreadLocalDelegate.setLoading(true);
				}
				runnable.run();
			} finally {
				if (bIsLoading) {
					OAThreadLocalDelegate.setLoading(false);
				}
			}
		}
	}

	public static void runTrigger(Runnable r) {
		Runnable rx = new TriggerRunnable(r);
		getExecutorService().submit(rx);
	}

	private static volatile ThreadPoolExecutor executorService;

	// thread pool to handle tasks that can run in the background.
	protected static ExecutorService getExecutorService() {
		if (executorService != null) {
			return executorService;
		}

		ThreadFactory tf = new ThreadFactory() {
			AtomicInteger ai = new AtomicInteger();

			@Override
			public Thread newThread(Runnable r) {
				Thread t = new Thread(r);
				t.setName("OATrigger.thread." + ai.getAndIncrement());
				t.setDaemon(true);
				t.setPriority(Thread.NORM_PRIORITY);
				return t;
			}
		};

		// min/max must be equal, since new threads are only created when queue is full
		executorService = new ThreadPoolExecutor(5, 5, 60L, TimeUnit.SECONDS, new LinkedBlockingQueue(Integer.MAX_VALUE), tf);
		executorService.allowCoreThreadTimeOut(true);

		return executorService;
	}
}