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pratikdaspratikdas
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thread dumo example
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‎core-java/threaddump/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.pratik.server</groupId>
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<artifactId>ServerApp</artifactId>
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<packaging>jar</packaging>
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<version>1.0-SNAPSHOT</version>
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<name>ServerApp</name>
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<url>http://maven.apache.org</url>
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<properties>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>3.8.1</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<source>11</source>
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<target>11</target>
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</configuration>
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</plugin>
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<plugin>
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<!-- Build an executable JAR -->
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>2.4</version>
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<configuration>
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<archive>
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<manifest>
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<mainClass>io.pratik.server.App</mainClass>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎core-java/threaddump/src/main/java/io/pratik/server/App.java‎

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package io.pratik.server;
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import java.net.ServerSocket;
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import java.util.logging.Logger;
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/**
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* @author pratikdas
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*
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*/
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public class App {
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private static final Logger logger = Logger.getLogger(App.class.getName());
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public static void main(String[] args) throws Exception {
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ServerSocket ssock = new ServerSocket(8080);
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logger.info("Server Started. Listening on port 8080");
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while (true) {
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new RequestProcessor(ssock).handleClientRequest();;
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}
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}
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}

‎core-java/threaddump/src/main/java/io/pratik/server/RequestProcessor.java‎

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/**
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*
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*/
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package io.pratik.server;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.logging.Logger;
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/**
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* @author pratikdas
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*
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*/
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public class RequestProcessor {
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private static final Logger logger = Logger.getLogger(RequestProcessor.class.getName());
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private ServerSocket serverSocket = null;
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public RequestProcessor(final ServerSocket ssock) {
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super();
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this.serverSocket = ssock;
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}
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public void handleClientRequest() throws IOException {
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try (Socket client = serverSocket.accept()) {
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logger.info("Processing request from client " + client.getInetAddress().getHostAddress());
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BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream()));
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StringBuilder requestBuilder = new StringBuilder();
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String line;
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while (!(line = br.readLine()).isBlank()) {
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requestBuilder.append(line + "\r\n");
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}
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String request = requestBuilder.toString();
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String[] requestsLines = request.split("\r\n");
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String[] requestLine = requestsLines[0].split(" ");
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String method = requestLine[0];
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String path = requestLine[1];
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String version = requestLine[2];
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String host = requestsLines[1].split(" ")[1];
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List<String> headers = new ArrayList<>();
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for (int h = 2; h < requestsLines.length; h++) {
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String header = requestsLines[h];
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headers.add(header);
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}
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String accessLog = String.format("Client %s, method %s, path %s, version %s, host %s, headers %s",
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client.toString(), method, path, version, host, headers.toString());
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System.out.println(accessLog);
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String contentType = "application/json";
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String dummyContent = "{\"message\":\"This is a dummy server. I am healthy\"}";
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sendResponse(client, "200 OK", contentType, dummyContent.getBytes());
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} catch (Exception e) {
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logger.info("Error in processing "+e.getMessage());
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}
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}
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private void sendResponse(Socket client, String status, String contentType, byte[] content) throws IOException {
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OutputStream clientOutput = client.getOutputStream();
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clientOutput.write(("HTTP/1.1 \r\n" + status).getBytes());
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clientOutput.write(("ContentType: " + contentType + "\r\n").getBytes());
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clientOutput.write("\r\n".getBytes());
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clientOutput.write(content);
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clientOutput.write("\r\n\r\n".getBytes());
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clientOutput.flush();
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client.close();
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}
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}

‎core-java/threaddump/src/main/java/io/pratik/threadops/ThreadMXBeanSample.java‎

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/**
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*
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*/
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package io.pratik.threadops;
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.lang.management.ThreadMXBean;
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import java.util.logging.Logger;
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/**
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* @author pratikdas
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*
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*/
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public class ThreadMXBeanSample {
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private static final Logger logger = Logger.getLogger(ThreadMXBeanSample.class.getName());
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public static void main(String[] args) {
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startThreads();
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ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean();
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for (ThreadInfo ti : threadMxBean.dumpAllThreads(true, true)) {
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logger.info(ti.toString());
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}
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logger.info("\nGeneral Thread information");
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logger.info(("Number of live threads :" + threadMxBean.getThreadCount()));
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logger.info("Total CPU time for the current thread: " + threadMxBean.getCurrentThreadCpuTime());
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logger.info("Current number of live daemon threads:" + threadMxBean.getDaemonThreadCount());
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logger.info("Peak live thread count :" + threadMxBean.getPeakThreadCount());
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logger.info("Total number of threads created and started : " + threadMxBean.getTotalStartedThreadCount());
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}
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/**
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* Starts two threads thread1 and thread2 and calls their synchronized methods
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* in the run method resulting in a deadlock.
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*/
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private static void startThreads() {
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final ThreadSample thread1 = new ThreadSample();
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final ThreadSample thread2 = new ThreadSample();
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Thread t1 = new Thread("Thread1") {
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public void run() {
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thread1.executeMethod1(thread2);
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}
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};
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Thread t2 = new Thread("Thread2") {
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@Override
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public void run() {
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thread2.executeMethod2(thread1);
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}
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};
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t1.start();
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t2.start();
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}
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}

‎core-java/threaddump/src/main/java/io/pratik/threadops/ThreadSample.java‎

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/**
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*
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*/
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package io.pratik.threadops;
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import java.util.logging.Logger;
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/**
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* @author pratikdas
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*
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*/
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public class ThreadSample {
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private static final Logger logger = Logger.getLogger(ThreadSample.class.getName());
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synchronized void executeMethod1(final ThreadSample thread) {
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log("Thread " + Thread.currentThread().getName() + " is executing");
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thread.executeMethod2(this);
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log(Thread.currentThread().getName() + " has finished method execution");
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}
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synchronized void executeMethod2(final ThreadSample thread) {
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log("Thread " + Thread.currentThread().getName() + " is executing");
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thread.executeMethod1(this);
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log(Thread.currentThread().getName() + " has finished method execution");
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}
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private void log(final String message) {
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System.out.println(message);
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//logger.info(message);
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}
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}

‎core-java/threaddump/src/test/java/io/pratik/AppTest.java‎

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package io.pratik;
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import junit.framework.Test;
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import junit.framework.TestCase;
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import junit.framework.TestSuite;
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/**
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* Unit test for simple App.
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*/
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public class AppTest
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extends TestCase
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{
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/**
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* Create the test case
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*
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* @param testName name of the test case
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*/
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public AppTest( String testName )
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{
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super( testName );
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}
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/**
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* @return the suite of tests being tested
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*/
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public static Test suite()
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{
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return new TestSuite( AppTest.class );
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}
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/**
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* Rigourous Test :-)
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*/
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public void testApp()
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{
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assertTrue( true );
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}
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}

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