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Commitfe20d0c

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StampedLock examples
1 parent83db082 commitfe20d0c

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3 files changed

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3 files changed

+154
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packagecom.winterbe.java8.samples.concurrent;
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importjava.util.concurrent.ExecutorService;
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importjava.util.concurrent.Executors;
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importjava.util.concurrent.TimeUnit;
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importjava.util.concurrent.locks.StampedLock;
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/**
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* @author Benjamin Winterberg
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*/
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publicclassLock4 {
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privatestaticintcount =0;
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publicstaticvoidmain(String[]args) {
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ExecutorServiceexecutor =Executors.newFixedThreadPool(2);
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StampedLocklock =newStampedLock();
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executor.submit(() -> {
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longstamp =lock.writeLock();
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try {
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count++;
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TimeUnit.SECONDS.sleep(1);
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}catch (InterruptedExceptione) {
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thrownewIllegalStateException(e);
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}finally {
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lock.unlockWrite(stamp);
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}
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});
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executor.submit(() -> {
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longstamp =lock.readLock();
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try {
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System.out.println(Thread.currentThread().getName() +": " +count);
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TimeUnit.SECONDS.sleep(1);
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}catch (InterruptedExceptione) {
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thrownewIllegalStateException(e);
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}finally {
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lock.unlockRead(stamp);
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}
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});
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executor.submit(() -> {
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longstamp =lock.readLock();
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try {
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System.out.println(Thread.currentThread().getName() +": " +count);
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TimeUnit.SECONDS.sleep(1);
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}catch (InterruptedExceptione) {
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thrownewIllegalStateException(e);
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}finally {
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lock.unlockRead(stamp);
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}
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});
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ConcurrentUtils.stop(executor);
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}
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}
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packagecom.winterbe.java8.samples.concurrent;
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importjava.util.concurrent.ExecutorService;
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importjava.util.concurrent.Executors;
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importjava.util.concurrent.TimeUnit;
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importjava.util.concurrent.locks.StampedLock;
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/**
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* @author Benjamin Winterberg
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*/
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publicclassLock5 {
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privatestaticintcount =0;
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publicstaticvoidmain(String[]args) {
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ExecutorServiceexecutor =Executors.newFixedThreadPool(2);
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StampedLocklock =newStampedLock();
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executor.submit(() -> {
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longstamp =lock.tryOptimisticRead();
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try {
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System.out.println("Optimistic Lock Valid: " +lock.validate(stamp));
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TimeUnit.SECONDS.sleep(1);
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System.out.println("Optimistic Lock Valid: " +lock.validate(stamp));
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}catch (InterruptedExceptione) {
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thrownewIllegalStateException(e);
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}finally {
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lock.unlock(stamp);
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}
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});
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executor.submit(() -> {
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longstamp =lock.writeLock();
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try {
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System.out.println("Write Lock acquired");
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incrementAndSleep(2);
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}finally {
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lock.unlock(stamp);
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System.out.println("Write done");
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}
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});
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ConcurrentUtils.stop(executor);
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}
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privatestaticvoidincrementAndSleep(intsleepSeconds) {
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try {
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count++;
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TimeUnit.SECONDS.sleep(sleepSeconds);
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}catch (InterruptedExceptione) {
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thrownewIllegalStateException(e);
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}
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}
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}
Lines changed: 39 additions & 0 deletions
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packagecom.winterbe.java8.samples.concurrent;
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importjava.util.concurrent.ExecutorService;
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importjava.util.concurrent.Executors;
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importjava.util.concurrent.locks.StampedLock;
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/**
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* @author Benjamin Winterberg
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*/
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publicclassLock6 {
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privatestaticintcount =0;
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publicstaticvoidmain(String[]args) {
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ExecutorServiceexecutor =Executors.newFixedThreadPool(2);
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StampedLocklock =newStampedLock();
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executor.submit(() -> {
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longstamp =lock.readLock();
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try {
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if (count ==0) {
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stamp =lock.tryConvertToWriteLock(stamp);
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if (stamp ==0L) {
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System.out.println("Could not convert to write lock");
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stamp =lock.writeLock();
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}
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count =23;
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}
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System.out.println(count);
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}finally {
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lock.unlock(stamp);
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}
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});
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ConcurrentUtils.stop(executor);
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}
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}

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