/**
* Test destroy of processes. A JavaChild is started and it starts three children. Each one is
* then checked to be alive and listed by descendants and forcibly destroyed. After they exit they
* should no longer be listed by descendants.
*/
@Test
public static void test3() {
ConcurrentHashMap<ProcessHandle, ProcessHandle> processes = new ConcurrentHashMap<>();
try {
ProcessHandle self = ProcessHandle.current();
JavaChild p1 = JavaChild.spawnJavaChild("stdin");
ProcessHandle p1Handle = p1.toHandle();
printf(" p1: %s%n", p1.getPid());
int newChildren = 3;
CountDownLatch spawnCount = new CountDownLatch(newChildren);
// Spawn children and have them wait
p1.sendAction("spawn", newChildren, "stdin");
// Gather the PIDs from the output of the spawning process
p1.forEachOutputLine(
(s) -> {
String[] split = s.trim().split(" ");
if (split.length == 3 && split[1].equals("spawn")) {
Long child = Long.valueOf(split[2]);
Long parent = Long.valueOf(split[0].split(":")[0]);
processes.put(ProcessHandle.of(child).get(), ProcessHandle.of(parent).get());
spawnCount.countDown();
}
});
// Wait for all the subprocesses to be listed as started
Assert.assertTrue(
spawnCount.await(Utils.adjustTimeout(30L), TimeUnit.SECONDS),
"Timeout waiting for processes to start");
// Debugging; list descendants that are not expected in processes
List<ProcessHandle> descendants = ProcessUtil.getDescendants(p1Handle);
long count = descendants.stream().filter(ph -> !processes.containsKey(ph)).count();
if (count > 0) {
descendants
.stream()
.filter(ph -> !processes.containsKey(ph))
.forEach(ph1 -> ProcessUtil.printProcess(ph1, "Extra process: "));
ProcessUtil.logTaskList();
Assert.assertEquals(0, count, "Extra processes in descendants");
}
// Verify that all spawned children are alive, show up in the descendants list
// then destroy them
processes.forEach(
(p, parent) -> {
Assert.assertEquals(p.isAlive(), true, "Child should be alive: " + p);
Assert.assertTrue(
descendants.contains(p), "Spawned child should be listed in descendants: " + p);
p.destroyForcibly();
});
Assert.assertEquals(processes.size(), newChildren, "Wrong number of children");
// Wait for each of the processes to exit
processes.forEach(
(p, parent) -> {
for (long retries = Utils.adjustTimeout(100L); retries > 0; retries--) {
if (!p.isAlive()) {
return; // not alive, go on to the next
}
// Wait a bit and retry
try {
Thread.sleep(100L);
} catch (InterruptedException ie) {
// try again
}
}
printf(
"Timeout waiting for exit of pid %s, parent: %s, info: %s%n", p, parent, p.info());
Assert.fail("Process still alive: " + p);
});
p1.destroyForcibly();
p1.waitFor();
// Verify that none of the spawned children are still listed by descendants
List<ProcessHandle> remaining = getDescendants(self);
Assert.assertFalse(remaining.remove(p1Handle), "Child p1 should have exited");
remaining = remaining.stream().filter(processes::containsKey).collect(Collectors.toList());
Assert.assertEquals(remaining.size(), 0, "Subprocess(es) should have exited: " + remaining);
} catch (IOException ioe) {
Assert.fail("Spawn of subprocess failed", ioe);
} catch (InterruptedException inte) {
Assert.fail("InterruptedException", inte);
} finally {
processes.forEach(
(p, parent) -> {
if (p.isAlive()) {
ProcessUtil.printProcess(p);
p.destroyForcibly();
}
});
}
}
/** A test for scale; launch a large number (14) of subprocesses. */
@Test
public static void test5() {
ConcurrentHashMap<ProcessHandle, ProcessHandle> processes = new ConcurrentHashMap<>();
int factor = 2;
JavaChild p1 = null;
Instant start = Instant.now();
try {
p1 = JavaChild.spawnJavaChild("stdin");
ProcessHandle p1Handle = p1.toHandle();
printf("Spawning %d x %d x %d processes, pid: %d%n", factor, factor, factor, p1.getPid());
// Start the first tier of subprocesses
p1.sendAction("spawn", factor, "stdin");
// Start the second tier of subprocesses
p1.sendAction("child", "spawn", factor, "stdin");
// Start the third tier of subprocesses
p1.sendAction("child", "child", "spawn", factor, "stdin");
int newChildren = factor * (1 + factor * (1 + factor));
CountDownLatch spawnCount = new CountDownLatch(newChildren);
// Gather the PIDs from the output of the spawning process
p1.forEachOutputLine(
(s) -> {
String[] split = s.trim().split(" ");
if (split.length == 3 && split[1].equals("spawn")) {
Long child = Long.valueOf(split[2]);
Long parent = Long.valueOf(split[0].split(":")[0]);
processes.put(ProcessHandle.of(child).get(), ProcessHandle.of(parent).get());
spawnCount.countDown();
}
});
// Wait for all the subprocesses to be listed as started
Assert.assertTrue(
spawnCount.await(Utils.adjustTimeout(30L), TimeUnit.SECONDS),
"Timeout waiting for processes to start");
// Debugging; list descendants that are not expected in processes
List<ProcessHandle> descendants = ProcessUtil.getDescendants(p1Handle);
long count = descendants.stream().filter(ph -> !processes.containsKey(ph)).count();
if (count > 0) {
descendants
.stream()
.filter(ph -> !processes.containsKey(ph))
.forEach(ph1 -> ProcessUtil.printProcess(ph1, "Extra process: "));
ProcessUtil.logTaskList();
Assert.assertEquals(0, count, "Extra processes in descendants");
}
Assert.assertEquals(getChildren(p1Handle).size(), factor, "expected direct children");
count = getDescendants(p1Handle).size();
long totalChildren = factor * factor * factor + factor * factor + factor;
Assert.assertTrue(
count >= totalChildren, "expected at least " + totalChildren + ", actual: " + count);
List<ProcessHandle> subprocesses = getDescendants(p1Handle);
printf(
" descendants: %s%n",
subprocesses.stream().map(p -> p.getPid()).collect(Collectors.toList()));
p1.getOutputStream().close(); // Close stdin for the controlling p1
p1.waitFor();
} catch (InterruptedException | IOException ex) {
Assert.fail("Unexpected Exception", ex);
} finally {
printf("Duration: %s%n", Duration.between(start, Instant.now()));
if (p1 != null) {
p1.destroyForcibly();
}
processes.forEach(
(p, parent) -> {
if (p.isAlive()) {
ProcessUtil.printProcess(p, "Process Cleanup: ");
p.destroyForcibly();
}
});
}
}
/** Test counting and spawning and counting of Processes. */
@Test
public static void test2() {
try {
ConcurrentHashMap<ProcessHandle, ProcessHandle> processes = new ConcurrentHashMap<>();
ProcessHandle self = ProcessHandle.current();
List<ProcessHandle> initialChildren = getChildren(self);
long count = initialChildren.size();
if (count > 0) {
initialChildren.forEach(p -> printDeep(p, "test2 initial unexpected: "));
}
JavaChild p1 = JavaChild.spawnJavaChild("stdin");
ProcessHandle p1Handle = p1.toHandle();
printf(" p1 pid: %d%n", p1.getPid());
// Gather the PIDs from the output of the spawing process
p1.forEachOutputLine(
(s) -> {
String[] split = s.trim().split(" ");
if (split.length == 3 && split[1].equals("spawn")) {
Long child = Long.valueOf(split[2]);
Long parent = Long.valueOf(split[0].split(":")[0]);
processes.put(ProcessHandle.of(child).get(), ProcessHandle.of(parent).get());
}
});
int spawnNew = 3;
p1.sendAction("spawn", spawnNew, "stdin");
// Wait for direct children to be created and save the list
List<ProcessHandle> subprocesses = waitForAllChildren(p1Handle, spawnNew);
Optional<Instant> p1Start = p1Handle.info().startInstant();
for (ProcessHandle ph : subprocesses) {
Assert.assertTrue(ph.isAlive(), "Child should be alive: " + ph);
// Verify each child was started after the parent
ph.info()
.startInstant()
.ifPresent(
childStart ->
p1Start.ifPresent(
parentStart -> {
Assert.assertFalse(
childStart.isBefore(parentStart),
String.format(
"Child process started before parent: child: %s, parent: %s",
childStart, parentStart));
}));
}
// Each child spawns two processes and waits for commands
int spawnNewSub = 2;
p1.sendAction("child", "spawn", spawnNewSub, "stdin");
// Poll until all 9 child processes exist or the timeout is reached
int expected = 9;
long timeout = Utils.adjustTimeout(60L);
Instant endTimeout = Instant.now().plusSeconds(timeout);
do {
Thread.sleep(200L);
printf(" subprocess count: %d, waiting for %d%n", processes.size(), expected);
} while (processes.size() < expected && Instant.now().isBefore(endTimeout));
if (processes.size() < expected) {
printf("WARNING: not all children have been started. Can't complete test.%n");
printf(" You can try to increase the timeout or%n");
printf(" you can try to use a faster VM (i.e. not a debug version).%n");
}
// show the complete list of children (for debug)
List<ProcessHandle> descendants = getDescendants(p1Handle);
printf(
" descendants: %s%n",
descendants.stream().map(p -> p.getPid()).collect(Collectors.toList()));
// Verify that all spawned children show up in the descendants List
processes.forEach(
(p, parent) -> {
Assert.assertEquals(p.isAlive(), true, "Child should be alive: " + p);
Assert.assertTrue(
descendants.contains(p), "Spawned child should be listed in descendants: " + p);
});
// Closing JavaChild's InputStream will cause all children to exit
p1.getOutputStream().close();
for (ProcessHandle p : descendants) {
try {
p.onExit().get(); // wait for the child to exit
} catch (ExecutionException e) {
Assert.fail("waiting for process to exit", e);
}
}
p1.waitFor(); // wait for spawned process to exit
// Verify spawned processes are no longer alive
processes.forEach(
(ph, parent) -> Assert.assertFalse(ph.isAlive(), "process should not be alive: " + ph));
} catch (IOException | InterruptedException t) {
t.printStackTrace();
throw new RuntimeException(t);
}
}