Guava 測試1

題目描述 ：http://fresh.qunar.com/pages/viewpage.action?pageId=5570576

jvm提供了一個jstack的工具，能夠把該jvm中運行的線程堆棧導出，具體見j.stack文件
好比
"DubboServerHandler-192.168.6.96:20880-thread-143" daemon prio=10 tid=0x00007f3d8006d000 nid=0x1807 waiting on condition [0x00007f3d67cfa000]
   java.lang.Thread.State: WAITING (parking)
         at sun.misc.Unsafe.park(Native Method)
         - parking to wait for  <0x00007f3f7c16b630> (a java.util.concurrent.SynchronousQueue$TransferStack)
         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
         at java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:422)
         at java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:323)
         at java.util.concurrent.SynchronousQueue.take(SynchronousQueue.java:857)
         at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
         at java.lang.Thread.run(Thread.java:619)
 
DubboServerHandler-192.168.6.96:20880-thread-143爲線程的名字，tid爲線程id ,java.lang.Thread.State: WAITING,WAITING爲線程狀態
waiting on condition [0x00007f3d67cfa000]表示該線程waiting在tid=0x00007f3d67cfa000的線程上
 
請寫一個程序，解析出線程名，線程id，線程狀態，以及哪些線程wait在同一個condition上 。就是說匹配「waiting on condition」的線程進行統計。
輸出結果按照等待同一個condition的線程數從大到小排序。
輸出格式以下：
condition id,count:
線程id|線程名|線程狀態
線程id|線程名|線程狀態
線程id|線程名|線程狀態
condition id,count:
線程id|線程名|線程狀態
線程id|線程名|線程狀態
……
 

GuaExam2.java

package libinchen;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;

import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

public class GuaExam2 {

	public static Map<String, Integer> m1 = Maps.newHashMap(); // String 中存儲的是 condition_id 
	public static Map<String, List<StringBuffer>> m2 = Maps.newHashMap(); 
	// StringBuffer 中存儲的是字符串   "線程 id | 線程名 | 線程狀態"   

	private static void getRightLine(File f1) throws IOException {

		BufferedReader br = new BufferedReader(new FileReader(f1));

		String strE1 = "waiting on condition ["; // 匹配
		
		String str;
		
		while ((str = br.readLine()) != null) {
			
			int ks = str.indexOf(strE1); // 找到符合條件的行

			if (ks != -1) { // 表明找到 E1 的位置	
				
				getTwoMap(str, br.readLine(), ks, strE1.length());
			}
		}
	}

	public static void p(Object o) {
		System.out.println(o);
	}
	
	public static void getTwoMap(String first, String second, int begin, int sLen) { // 分析符合條件的行，提取出來
		
		String seTid = "tid=", sNameEnd = "\" ";

		String E2 = "java.lang.Thread.State: ";

		String conTid, sTid, sName, sState;
		
		conTid = first.substring(begin + sLen, begin + sLen + 18); // 提取構造 condition，tid
		
		if (!m1.containsKey(conTid)) {
			m1.put(conTid, 1);
		} else {
			int freq = m1.get(conTid);
			m1.put(conTid, freq + 1);
		} // 構造 Map m1

		int ks = first.indexOf(seTid);
		sTid = first.substring(ks + seTid.length(), ks + seTid.length()+ 18); // 構造 tid

		ks = first.indexOf(sNameEnd);
		sName = first.substring(1, ks); // 構造  線程名 : sName
		
		StringBuffer son = new StringBuffer();
		
		son.append(sTid).append("|").append(sName).append("|");

		
		ks = second.indexOf(E2);
		if (ks != -1) {
			String tmp = second.substring(ks + E2.length());
			for (int i = 0; i < tmp.length(); i++) {
				if (tmp.charAt(i) == ' ') { 
					break;
				}
				son.append(tmp.charAt(i));
			}
		}

		if (!m2.containsKey(conTid)) {
			List<StringBuffer> kl = Lists.newArrayList();
			kl.add(son);
			m2.put(conTid, kl);
		} else {
			List<StringBuffer> kl = m2.get(conTid);
			kl.add(son);
			m2.put(conTid, kl);
		}

	}
	

	public static Map sortByValue(Map<String, Integer> map) {

		List list = new LinkedList(map.entrySet());

		Collections.sort(list, new Comparator() {
			public int compare(Object o1, Object o2) {
				return ((Comparable) ((Map.Entry) o2).getValue())
						.compareTo(((Map.Entry) o1).getValue());
			}
		});

		Map result = Maps.newLinkedHashMap();
		for (Iterator it = list.iterator(); it.hasNext();) {
			Map.Entry entry = (Map.Entry) it.next();
			result.put(entry.getKey(), entry.getValue());
		}
		return result;
	}

	static int lineCount = 0;
    /* Main */
	public static void startMain() throws IOException {
		getRightLine(new File("/home/mxw/j.stack"));
		//p(GuaExam2.class.getClass().getResource("/j.stack").getPath());
		//p(GuaExam2.class.getClass().getResource("/").getPath());
		//File file = new File(GuaExam2.class.getClass().getResource("/").getPath() + "result.txt");
		
		File file = new File("/home/mxw/examresult/libinchen.txt");
		
		PrintStream out = new PrintStream(new FileOutputStream(file)); 
		
		System.setOut(out); 
		
		m1 = sortByValue(m1);
		
		for (String key : m1.keySet()) {
			p("conditionid:" + key + ",count:" + m2.get(key).size());
			lineCount++;
			Iterator it = m2.get(key).iterator();
			while (it.hasNext()) {
				p(it.next());
				lineCount++;
			}
		}
		//p(lineCount);
	}
}

Exam.java

package libinchen;

import java.io.File;
import java.io.IOException;

public class Exam {
     public static void exam() {
         GuaExam2 analyse = new GuaExam2();
         try {
			analyse.startMain();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
     }
     /*
     public static void main(String[] args) throws IOException {
    	 Exam.exam();
     }
     */
}

pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.qunar.fresh</groupId>
	<artifactId>Exam1</artifactId>
	<version>1.0-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>Exam1</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.1</version>
      <scope>test</scope>
    </dependency>
		<dependency>
			<groupId>com.google.guava</groupId>
			<artifactId>guava</artifactId>
			<version>15.0</version>
		</dependency>
	</dependencies>
</project>