/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.alibaba.csp.sentinel.dashboard.controller;

import com.alibaba.csp.sentinel.Entry;
import com.alibaba.csp.sentinel.EntryType;
import com.alibaba.csp.sentinel.SphU;
import com.alibaba.csp.sentinel.context.ContextUtil;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Random;
import java.util.concurrent.TimeUnit;

@Controller
@RequestMapping(value = "/demo", produces = MediaType.APPLICATION_JSON_VALUE)
public class DemoController {

	Logger logger = LoggerFactory.getLogger(MachineRegistryController.class);

	@RequestMapping("/greeting")
	public String greeting() {
		return "index";
	}

	@RequestMapping("/link")
	@ResponseBody
	public String link() throws BlockException {

		Entry entry = SphU.entry("head1", EntryType.IN);

		Entry entry1 = SphU.entry("head2", EntryType.IN);
		Entry entry2 = SphU.entry("head3", EntryType.IN);
		Entry entry3 = SphU.entry("head4", EntryType.IN);

		entry3.exit();
		entry2.exit();
		entry1.exit();
		entry.exit();
		return "successfully create a call link";
	}

	@RequestMapping("/loop")
	@ResponseBody
	public String loop(String name, int time) throws BlockException {
		for (int i = 0; i < 10; i++) {
			Thread timer = new Thread(new RunTask(name, time, false));
			timer.setName("false");
			timer.start();
		}
		return "successfully create a loop thread";
	}

	@RequestMapping("/slow")
	@ResponseBody
	public String slow(String name, int time) throws BlockException {
		for (int i = 0; i < 10; i++) {
			Thread timer = new Thread(new RunTask(name, time, true));
			timer.setName("false");
			timer.start();
		}
		return "successfully create a loop thread";
	}

	static class RunTask implements Runnable {

		int time;

		boolean stop = false;

		String name;

		boolean slow = false;

		public RunTask(String name, int time, boolean slow) {
			super();
			this.time = time;
			this.name = name;
			this.slow = slow;
		}

		@Override
		public void run() {
			long startTime = System.currentTimeMillis();
			ContextUtil.enter(String.valueOf(startTime));
			while (!stop) {

				long now = System.currentTimeMillis();
				if (now - startTime > time * 1000) {
					stop = true;
				}
				Entry e1 = null;
				try {
					e1 = SphU.entry(name);

					if (slow) {
						TimeUnit.MILLISECONDS.sleep(3000);
					}

				}
				catch (Exception e) {
				}
				finally {
					if (e1 != null) {
						e1.exit();
					}
				}
				Random random2 = new Random();
				try {
					TimeUnit.MILLISECONDS.sleep(random2.nextInt(200));
				}
				catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}
			ContextUtil.exit();
		}

	}

}
