インタフェース呼び出し周波数制限コード

多くの場合、私たちが書いたコードは、あなたがどれだけ速く走りたいのか、どれだけ速く走ることができるのかではありません.古いコアシステムが支えられないため、このような仕方がない状況では、
 
古いシステムのインタフェースを呼び出すと、サービスは受け入れられる範囲の参考になる必要があります.
 
また、コードをより速く実行するために独自の最適化技術も使用されています.現実は残酷で、そんなに完璧ではありません.弓にやられるよりも、楽しんだほうがいいです.
 
 
ThreadLocalに基づいて呼び出し頻度を制限するコードを共有します.
 
中にはcommons-langのStopWatchタイマーが導入されています
 
 

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.opencfg.core.limit;

import org.apache.commons.lang.time.StopWatch;

/**
 * 

 * Frequence Utils
 * 

 * 
 * 
#ThreadSafe#
 * 
 * @author Opencfg Software Foundation
 * @since 0.0.1-SNAPSHOT
 * @version $Id: FrequenceUtils.java 2011-06-11 23:58:53 reymondtu $
 */
public final class FrequenceUtils {

	/**
	 * 

	 * Limit call count in split time
	 * 
	 * 
	 * @param limitSplitTime
	 * @param limitCount
	 * @throws InterruptedException
	 */
	public static void limit(final long limitSplitTime, final int limitCount) throws InterruptedException {
		FrequenceUnit funit = threadLocal.get();
		funit.limitSplitTime = limitSplitTime;
		funit.limitCount = limitCount;
		funit.watch.split();
		long diffTime = funit.limitSplitTime - funit.watch.getSplitTime();
		if (diffTime >= 0) {
			if (funit.realCount >= funit.limitCount) {
				funit.watch.suspend();
				Thread.sleep(diffTime);
				funit.watch.resume();
				funit.realCount = 0;
			}
		}
		funit.realCount++;
	}
	
	/**
	 * FrequenceUnit
	 */
	private static class FrequenceUnit {		
		FrequenceUnit() {
			this.watch = new StopWatch();
		}
		long limitSplitTime;
		int limitCount;
		StopWatch watch;		
		int realCount = 0;
	}

	private static ThreadLocal threadLocal = new ThreadLocal(){
        protected synchronized FrequenceUnit initialValue() {
        	FrequenceUnit funit = new FrequenceUnit();
        	funit.watch.start();
            return funit;
        }
    };

}

 
 
次はテスト例です.
 
 

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.opencfg.core.limit;

import static org.junit.Assert.assertTrue;

import org.junit.Test;

/**
 * 

 * Frequence Utils Test
 * 

 * 
 * 
JUnit4 Test
 * 
 * @author Opencfg Software Foundation
 * @since 0.0.1-SNAPSHOT
 * @version $Id: FrequenceUtilsTest.java 2011-06-12 01:36:53 reymondtu $
 */
public class FrequenceUtilsTest {

	@Test
	public void testLimit() throws InterruptedException {
		FrequenceTestClass ftc = new FrequenceTestClass(1000, 10);
		for(int i = 0; i < 100; i++) {
			ftc.method(i);
		}
		assertTrue(true);
	}
	
	@Test
	public void testLimitMutiThreads() throws InterruptedException {
		Thread t1 = new Thread(new FrequenceTestClass(1000, 10));
		t1.start();
		
		Thread t2 = new Thread(new FrequenceTestClass(1000, 20));
		t2.start();

		Thread.sleep(10000);
	}

	class FrequenceTestClass implements Runnable {
		final long limitTime;
		final int limitCount;
		FrequenceTestClass(final long limitTime, final int limitCount) {
			this.limitTime = limitTime;
			this.limitCount = limitCount;
		}
		public void method(int i) throws InterruptedException {
			FrequenceUtils.limit(limitTime, limitCount);
			System.out.println("tid:" + Thread.currentThread().getId() + ", i=" + i);
		}

		@Override
		public void run() {
			for(int i = 0; i < 100; i++) {
				try {
					method(i);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}

}