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JAVA-5393 Update Java 9 Process API

This commit is contained in:
mikr 2021-08-31 17:30:10 +02:00
parent 5d69f00f86
commit 2453ef75bb
2 changed files with 101 additions and 132 deletions
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101
core-java-modules/core-java-os/src/main/java/com/baeldung/java9/process/ProcessAPIEnhancements.java Normal file
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@ -0,0 +1,101 @@
package com.baeldung.java9.process;
import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.stream.Stream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ProcessAPIEnhancements {
static Logger log = LoggerFactory.getLogger(ProcessAPIEnhancements.class);
public static void main(String[] args) throws IOException, InterruptedException, ExecutionException {
infoOfCurrentProcess();
infoOfLiveProcesses();
infoOfSpawnProcess();
infoOfExitCallback();
infoOfChildProcess();
}
private static void infoOfCurrentProcess() {
ProcessHandle processHandle = ProcessHandle.current();
ProcessHandle.Info processInfo = processHandle.info();
log.info("PID: " + processHandle.pid());
log.info("Arguments: " + processInfo.arguments());
log.info("Command: " + processInfo.command());
log.info("Instant: " + processInfo.startInstant());
log.info("Total CPU duration: " + processInfo.totalCpuDuration());
log.info("User: " + processInfo.user());
}
private static void infoOfSpawnProcess() throws IOException {
String javaCmd = ProcessUtils.getJavaCmd().getAbsolutePath();
ProcessBuilder processBuilder = new ProcessBuilder(javaCmd, "-version");
Process process = processBuilder.inheritIO().start();
ProcessHandle processHandle = process.toHandle();
ProcessHandle.Info processInfo = processHandle.info();
log.info("PID: " + processHandle.pid());
log.info("Arguments: " + processInfo.arguments());
log.info("Command: " + processInfo.command());
log.info("Instant: " + processInfo.startInstant());
log.info("Total CPU duration: " + processInfo.totalCpuDuration());
log.info("User: " + processInfo.user());
}
private static void infoOfLiveProcesses() {
Stream<ProcessHandle> liveProcesses = ProcessHandle.allProcesses();
liveProcesses.filter(ProcessHandle::isAlive)
.forEach(ph -> {
log.info("PID: " + ph.pid());
log.info("Instance: " + ph.info().startInstant());
log.info("User: " + ph.info().user());
});
}
private static void infoOfChildProcess() throws IOException {
int childProcessCount = 5;
for (int i = 0; i < childProcessCount; i++) {
String javaCmd = ProcessUtils.getJavaCmd()
.getAbsolutePath();
ProcessBuilder processBuilder
= new ProcessBuilder(javaCmd, "-version");
processBuilder.inheritIO().start();
}
Stream<ProcessHandle> children = ProcessHandle.current()
.children();
children.filter(ProcessHandle::isAlive)
.forEach(ph -> log.info("PID: {}, Cmd: {}", ph.pid(), ph.info()
.command()));
Stream<ProcessHandle> descendants = ProcessHandle.current()
.descendants();
descendants.filter(ProcessHandle::isAlive)
.forEach(ph -> log.info("PID: {}, Cmd: {}", ph.pid(), ph.info()
.command()));
}
private static void infoOfExitCallback() throws IOException, InterruptedException, ExecutionException {
String javaCmd = ProcessUtils.getJavaCmd()
.getAbsolutePath();
ProcessBuilder processBuilder
= new ProcessBuilder(javaCmd, "-version");
Process process = processBuilder.inheritIO()
.start();
ProcessHandle processHandle = process.toHandle();
log.info("PID: {} has started", processHandle.pid());
CompletableFuture<ProcessHandle> onProcessExit = processHandle.onExit();
onProcessExit.get();
log.info("Alive: " + processHandle.isAlive());
onProcessExit.thenAccept(ph -> {
log.info("PID: {} has stopped", ph.pid());
});
}
}

132
core-java-modules/core-java-os/src/test/java/com/baeldung/java9/process/ProcessAPIEnhancementsUnitTest.java
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@ -1,132 +0,0 @@
package com.baeldung.java9.process;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Stream;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Created by sanaulla on 2/23/2017.
*/
public class ProcessAPIEnhancementsUnitTest {
Logger log = LoggerFactory.getLogger(ProcessAPIEnhancementsUnitTest.class);
// @Test
// OS / Java version dependent
public void givenCurrentProcess_whenInvokeGetInfo_thenSuccess() throws IOException {
ProcessHandle processHandle = ProcessHandle.current();
ProcessHandle.Info processInfo = processHandle.info();
assertNotNull(processHandle.pid());
assertEquals(true, processInfo.arguments()
.isPresent());
assertEquals(true, processInfo.command()
.isPresent());
assertTrue(processInfo.command()
.get()
.contains("java"));
assertEquals(true, processInfo.startInstant()
.isPresent());
assertEquals(true, processInfo.totalCpuDuration()
.isPresent());
assertEquals(true, processInfo.user()
.isPresent());
}
// @Test
// OS / Java version dependent
public void givenSpawnProcess_whenInvokeGetInfo_thenSuccess() throws IOException {
String javaCmd = ProcessUtils.getJavaCmd()
.getAbsolutePath();
ProcessBuilder processBuilder = new ProcessBuilder(javaCmd, "-version");
Process process = processBuilder.inheritIO()
.start();
ProcessHandle processHandle = process.toHandle();
ProcessHandle.Info processInfo = processHandle.info();
assertNotNull(processHandle.pid());
assertEquals(true, processInfo.arguments()
.isPresent());
assertEquals(true, processInfo.command()
.isPresent());
assertTrue(processInfo.command()
.get()
.contains("java"));
assertEquals(true, processInfo.startInstant()
.isPresent());
assertEquals(false, processInfo.totalCpuDuration()
.isPresent());
assertEquals(true, processInfo.user()
.isPresent());
}
// @Test
// OS / Java version dependent
public void givenLiveProcesses_whenInvokeGetInfo_thenSuccess() {
Stream<ProcessHandle> liveProcesses = ProcessHandle.allProcesses();
liveProcesses.filter(ProcessHandle::isAlive)
.forEach(ph -> {
assertNotNull(ph.pid());
assertEquals(true, ph.info()
.startInstant()
.isPresent());
assertEquals(true, ph.info()
.user()
.isPresent());
});
}
// @Test
// OS / Java version dependent
public void givenProcess_whenGetChildProcess_thenSuccess() throws IOException {
int childProcessCount = 5;
for (int i = 0; i < childProcessCount; i++) {
String javaCmd = ProcessUtils.getJavaCmd()
.getAbsolutePath();
ProcessBuilder processBuilder
= new ProcessBuilder(javaCmd, "-version");
processBuilder.inheritIO().start();
}
Stream<ProcessHandle> children = ProcessHandle.current()
.children();
children.filter(ProcessHandle::isAlive)
.forEach(ph -> log.info("PID: {}, Cmd: {}", ph.pid(), ph.info()
.command()));
Stream<ProcessHandle> descendants = ProcessHandle.current()
.descendants();
descendants.filter(ProcessHandle::isAlive)
.forEach(ph -> log.info("PID: {}, Cmd: {}", ph.pid(), ph.info()
.command()));
}
// @Test
// OS / Java version dependent
public void givenProcess_whenAddExitCallback_thenSuccess() throws Exception {
String javaCmd = ProcessUtils.getJavaCmd()
.getAbsolutePath();
ProcessBuilder processBuilder
= new ProcessBuilder(javaCmd, "-version");
Process process = processBuilder.inheritIO()
.start();
ProcessHandle processHandle = process.toHandle();
log.info("PID: {} has started", processHandle.pid());
CompletableFuture<ProcessHandle> onProcessExit = processHandle.onExit();
onProcessExit.get();
assertEquals(false, processHandle.isAlive());
onProcessExit.thenAccept(ph -> {
log.info("PID: {} has stopped", ph.pid());
});
}
}