package eu.ase.lambdathreads;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.ReentrantLock;
import java.util.stream.IntStream;
import java.util.concurrent.TimeUnit;
/**
* @author Benjamin Winterberg
*/
public class ProgMainExecServiceLock07 {
private static final int NUM_INCREMENTS = 1000;
private static ReentrantLock lock = new ReentrantLock();
private static int count = 0;
private static void increment() {
try { Thread.currentThread().sleep(50); }
catch(InterruptedException ie) {ie.printStackTrace();}
count++;
}
private static void incrementSync() {
lock.lock();
try {
count++;
} finally {
lock.unlock();
}
}
public static void main(String[] args) {
testLock();
testLockSync();
}
private static void stop(ExecutorService executor) {
// executor shutdown
try {
System.out.println("attempt to shutdown executor");
executor.shutdown();
executor.awaitTermination(55, TimeUnit.SECONDS);
}
catch (InterruptedException e) {
System.err.println("tasks interrupted");
}
finally {
if (!executor.isTerminated()) {
System.err.println("cancel non-finished tasks");
}
executor.shutdownNow();
System.out.println("shutdown finished");
}
System.out.println("Done!");
}
private static void testLock() {
count = 0;
ExecutorService executor = Executors.newFixedThreadPool(2);
IntStream.range(0, NUM_INCREMENTS)
.forEach(i -> executor.submit(ProgMainExecServiceLock07::increment));
stop(executor);
System.out.println(count);
}
private static void testLockSync() {
count = 0;
ExecutorService executor = Executors.newFixedThreadPool(2);
IntStream.range(0, NUM_INCREMENTS)
.forEach(i -> executor.submit(ProgMainExecServiceLock07::incrementSync));
stop(executor);
System.out.println(count);
}
} //end class
