Multiple ExecutorCompletionService not working
1
I've a requirement to start and stop task from java application. I'm trying to use
ExecutorService to create threads and ExecutorCompletionService to check
processing status of thread . Startup and stop is a continious activity so in my
test code I've created a while loop .
public class ProcessController {
String processArray = { "Process1", "Process2", "Process3", "Process4", "Process5", "Process6", "Process7" };
private List<String> processList = Arrays.asList(processArray);
public static void main(String args ) {
ExecutorService startUpExecutor = Executors.newFixedThreadPool(3);
ExecutorService cleanUpExecutor = Executors.newFixedThreadPool(3);
CompletionService<String> startUpCompletionService = new ExecutorCompletionService<>(startUpExecutor);
CompletionService<String> cleanUpCompletionService = new ExecutorCompletionService<>(cleanUpExecutor);
List<Future<String>> cleanupFutures = new ArrayList<Future<String>>();
List<Future<String>> startupFutures = new ArrayList<Future<String>>();
ProcessController myApp = new ProcessController();
int i = 0;
while (i++ < 3) {
System.out.println("**********Starting Iteration " + i + "************* =====> ");
if (!cleanupFutures.isEmpty()) cleanupFutures.clear();
myApp.processList.forEach(process -> cleanupFutures.add(cleanUpCompletionService.submit(new CleanupTask(process))));
myApp.processList.forEach(process -> startupFutures.add(startUpCompletionService.submit(new StartupTask(process))));
for (Future<String> f : cleanupFutures) {
try {
String result = cleanUpCompletionService.take().get();
System.out.println("Result from Cleanup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
for (Future<String> f1 : startupFutures) {
try {
String result = startUpCompletionService.take().get();
System.out.println("Result from startup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
System.out.println("**********Finished Iteration " + i + "************* =====> ");
}
startUpExecutor.shutdown();
cleanUpExecutor.shutdown();
}
}
CleanupTask class
public class CleanupTask implements Callable<String> {
private String task;
public CleanupTask(String task) {
this.task = task;
}
@Override
public String call() throws Exception {
checkIfAnyFinished();
return "finished clean up processing for " + getThreadId();
}
private void checkIfAnyFinished( )
{
System.out.println( getThreadId() + " Checking if task " + this.task + " is finished");
try {
isFinished();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void isFinished() throws InterruptedException {
Thread.sleep(1000*4);
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Startup Task class
public class StartupTask implements Callable<String> {
private String processSchedule ;
public StartupTask(String processSchedule) {
this.processSchedule = processSchedule;
}
@Override
public String call() {
scheduleifdue();
return "finished start up up processing for " + getThreadId();
}
private void scheduleifdue()
{
System.out.println(getThreadId() + " Checking " + this.processSchedule + " is due or not");
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Above code successfully complete iteration 1 and start 2nd iteration . But it never finish and keeps running.
When I run the same application only with one task( either cleanup or startup) then it run without any issues. I'm not sure what is causing issue.
java executorservice java.util.concurrent
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
add a comment |
1
I've a requirement to start and stop task from java application. I'm trying to use
ExecutorService to create threads and ExecutorCompletionService to check
processing status of thread . Startup and stop is a continious activity so in my
test code I've created a while loop .
public class ProcessController {
String processArray = { "Process1", "Process2", "Process3", "Process4", "Process5", "Process6", "Process7" };
private List<String> processList = Arrays.asList(processArray);
public static void main(String args ) {
ExecutorService startUpExecutor = Executors.newFixedThreadPool(3);
ExecutorService cleanUpExecutor = Executors.newFixedThreadPool(3);
CompletionService<String> startUpCompletionService = new ExecutorCompletionService<>(startUpExecutor);
CompletionService<String> cleanUpCompletionService = new ExecutorCompletionService<>(cleanUpExecutor);
List<Future<String>> cleanupFutures = new ArrayList<Future<String>>();
List<Future<String>> startupFutures = new ArrayList<Future<String>>();
ProcessController myApp = new ProcessController();
int i = 0;
while (i++ < 3) {
System.out.println("**********Starting Iteration " + i + "************* =====> ");
if (!cleanupFutures.isEmpty()) cleanupFutures.clear();
myApp.processList.forEach(process -> cleanupFutures.add(cleanUpCompletionService.submit(new CleanupTask(process))));
myApp.processList.forEach(process -> startupFutures.add(startUpCompletionService.submit(new StartupTask(process))));
for (Future<String> f : cleanupFutures) {
try {
String result = cleanUpCompletionService.take().get();
System.out.println("Result from Cleanup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
for (Future<String> f1 : startupFutures) {
try {
String result = startUpCompletionService.take().get();
System.out.println("Result from startup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
System.out.println("**********Finished Iteration " + i + "************* =====> ");
}
startUpExecutor.shutdown();
cleanUpExecutor.shutdown();
}
}
CleanupTask class
public class CleanupTask implements Callable<String> {
private String task;
public CleanupTask(String task) {
this.task = task;
}
@Override
public String call() throws Exception {
checkIfAnyFinished();
return "finished clean up processing for " + getThreadId();
}
private void checkIfAnyFinished( )
{
System.out.println( getThreadId() + " Checking if task " + this.task + " is finished");
try {
isFinished();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void isFinished() throws InterruptedException {
Thread.sleep(1000*4);
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Startup Task class
public class StartupTask implements Callable<String> {
private String processSchedule ;
public StartupTask(String processSchedule) {
this.processSchedule = processSchedule;
}
@Override
public String call() {
scheduleifdue();
return "finished start up up processing for " + getThreadId();
}
private void scheduleifdue()
{
System.out.println(getThreadId() + " Checking " + this.processSchedule + " is due or not");
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Above code successfully complete iteration 1 and start 2nd iteration . But it never finish and keeps running.
When I run the same application only with one task( either cleanup or startup) then it run without any issues. I'm not sure what is causing issue.
java executorservice java.util.concurrent
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
add a comment |
1
1
1
1
I've a requirement to start and stop task from java application. I'm trying to use
ExecutorService to create threads and ExecutorCompletionService to check
processing status of thread . Startup and stop is a continious activity so in my
test code I've created a while loop .
public class ProcessController {
String processArray = { "Process1", "Process2", "Process3", "Process4", "Process5", "Process6", "Process7" };
private List<String> processList = Arrays.asList(processArray);
public static void main(String args ) {
ExecutorService startUpExecutor = Executors.newFixedThreadPool(3);
ExecutorService cleanUpExecutor = Executors.newFixedThreadPool(3);
CompletionService<String> startUpCompletionService = new ExecutorCompletionService<>(startUpExecutor);
CompletionService<String> cleanUpCompletionService = new ExecutorCompletionService<>(cleanUpExecutor);
List<Future<String>> cleanupFutures = new ArrayList<Future<String>>();
List<Future<String>> startupFutures = new ArrayList<Future<String>>();
ProcessController myApp = new ProcessController();
int i = 0;
while (i++ < 3) {
System.out.println("**********Starting Iteration " + i + "************* =====> ");
if (!cleanupFutures.isEmpty()) cleanupFutures.clear();
myApp.processList.forEach(process -> cleanupFutures.add(cleanUpCompletionService.submit(new CleanupTask(process))));
myApp.processList.forEach(process -> startupFutures.add(startUpCompletionService.submit(new StartupTask(process))));
for (Future<String> f : cleanupFutures) {
try {
String result = cleanUpCompletionService.take().get();
System.out.println("Result from Cleanup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
for (Future<String> f1 : startupFutures) {
try {
String result = startUpCompletionService.take().get();
System.out.println("Result from startup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
System.out.println("**********Finished Iteration " + i + "************* =====> ");
}
startUpExecutor.shutdown();
cleanUpExecutor.shutdown();
}
}
CleanupTask class
public class CleanupTask implements Callable<String> {
private String task;
public CleanupTask(String task) {
this.task = task;
}
@Override
public String call() throws Exception {
checkIfAnyFinished();
return "finished clean up processing for " + getThreadId();
}
private void checkIfAnyFinished( )
{
System.out.println( getThreadId() + " Checking if task " + this.task + " is finished");
try {
isFinished();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void isFinished() throws InterruptedException {
Thread.sleep(1000*4);
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Startup Task class
public class StartupTask implements Callable<String> {
private String processSchedule ;
public StartupTask(String processSchedule) {
this.processSchedule = processSchedule;
}
@Override
public String call() {
scheduleifdue();
return "finished start up up processing for " + getThreadId();
}
private void scheduleifdue()
{
System.out.println(getThreadId() + " Checking " + this.processSchedule + " is due or not");
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Above code successfully complete iteration 1 and start 2nd iteration . But it never finish and keeps running.
When I run the same application only with one task( either cleanup or startup) then it run without any issues. I'm not sure what is causing issue.
java executorservice java.util.concurrent
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
I've a requirement to start and stop task from java application. I'm trying to use
ExecutorService to create threads and ExecutorCompletionService to check
processing status of thread . Startup and stop is a continious activity so in my
test code I've created a while loop .
public class ProcessController {
String processArray = { "Process1", "Process2", "Process3", "Process4", "Process5", "Process6", "Process7" };
private List<String> processList = Arrays.asList(processArray);
public static void main(String args ) {
ExecutorService startUpExecutor = Executors.newFixedThreadPool(3);
ExecutorService cleanUpExecutor = Executors.newFixedThreadPool(3);
CompletionService<String> startUpCompletionService = new ExecutorCompletionService<>(startUpExecutor);
CompletionService<String> cleanUpCompletionService = new ExecutorCompletionService<>(cleanUpExecutor);
List<Future<String>> cleanupFutures = new ArrayList<Future<String>>();
List<Future<String>> startupFutures = new ArrayList<Future<String>>();
ProcessController myApp = new ProcessController();
int i = 0;
while (i++ < 3) {
System.out.println("**********Starting Iteration " + i + "************* =====> ");
if (!cleanupFutures.isEmpty()) cleanupFutures.clear();
myApp.processList.forEach(process -> cleanupFutures.add(cleanUpCompletionService.submit(new CleanupTask(process))));
myApp.processList.forEach(process -> startupFutures.add(startUpCompletionService.submit(new StartupTask(process))));
for (Future<String> f : cleanupFutures) {
try {
String result = cleanUpCompletionService.take().get();
System.out.println("Result from Cleanup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
for (Future<String> f1 : startupFutures) {
try {
String result = startUpCompletionService.take().get();
System.out.println("Result from startup thread : " + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
System.out.println("**********Finished Iteration " + i + "************* =====> ");
}
startUpExecutor.shutdown();
cleanUpExecutor.shutdown();
}
}
CleanupTask class
public class CleanupTask implements Callable<String> {
private String task;
public CleanupTask(String task) {
this.task = task;
}
@Override
public String call() throws Exception {
checkIfAnyFinished();
return "finished clean up processing for " + getThreadId();
}
private void checkIfAnyFinished( )
{
System.out.println( getThreadId() + " Checking if task " + this.task + " is finished");
try {
isFinished();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void isFinished() throws InterruptedException {
Thread.sleep(1000*4);
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Startup Task class
public class StartupTask implements Callable<String> {
private String processSchedule ;
public StartupTask(String processSchedule) {
this.processSchedule = processSchedule;
}
@Override
public String call() {
scheduleifdue();
return "finished start up up processing for " + getThreadId();
}
private void scheduleifdue()
{
System.out.println(getThreadId() + " Checking " + this.processSchedule + " is due or not");
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private String getThreadId()
{
return Thread.currentThread().getName();
}
}
Above code successfully complete iteration 1 and start 2nd iteration . But it never finish and keeps running.
When I run the same application only with one task( either cleanup or startup) then it run without any issues. I'm not sure what is causing issue.
java executorservice java.util.concurrent
java executorservice java.util.concurrent
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
asked Nov 19 '18 at 18:12
BobCoderBobCoder
1029
1029
add a comment |
add a comment |
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