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package org.dcache.resilience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.stream.Collectors;
import org.dcache.resilience.util.ExceptionMessage;
public final class TestSynchronousExecutor implements ScheduledExecutorService {
public enum Mode {
NOP, RUN, FAIL
}
final Logger logger = LoggerFactory.getLogger(this.getClass());
final Mode mode;
public TestSynchronousExecutor(Mode mode) {
this.mode = mode;
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit)
throws InterruptedException {
return false;
}
@Override
public void execute(Runnable command) {
switch (mode) {
case NOP:
case FAIL:
break;
default:
command.run();
}
}
@Override
public <T> List<Future<T>> invokeAll(
Collection<? extends Callable<T>> tasks)
throws InterruptedException {
return tasks.stream().map((t) -> submit(t)).collect(
Collectors.toList());
}
@Override
public <T> List<Future<T>> invokeAll(
Collection<? extends Callable<T>> tasks, long timeout,
TimeUnit unit) throws InterruptedException {
return invokeAll(tasks);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
throws InterruptedException, ExecutionException {
Callable<T> chosen = tasks.iterator().next();
submit(chosen);
return null;
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks,
long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException,
TimeoutException {
return invokeAny(tasks);
}
@Override
public boolean isShutdown() {
return false;
}
@Override
public boolean isTerminated() {
return false;
}
@Override
public ScheduledFuture<?> schedule(Runnable command, long delay,
TimeUnit unit) {
execute(command);
return null;
}
@Override
public <V> ScheduledFuture<V> schedule(Callable<V> callable, long delay,
TimeUnit unit) {
submit(callable);
return null;
}
@Override
public ScheduledFuture<?> scheduleAtFixedRate(Runnable command,
long initialDelay,
long period, TimeUnit unit) {
execute(command);
return null;
}
@Override
public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command,
long initialDelay,
long delay,
TimeUnit unit) {
execute(command);
return null;
}
@Override
public void shutdown() {
}
@Override
public List<Runnable> shutdownNow() {
return null;
}
@Override
public <T> Future<T> submit(Callable<T> task) {
try {
switch (mode) {
case NOP:
case FAIL:
break;
default:
task.call();
}
} catch (Exception e) {
logger.error("{}", new ExceptionMessage(e));
}
return new FutureTask<T>(task);
}
@Override
public <T> Future<T> submit(Runnable task, T result) {
try {
execute(task);
} catch (Exception e) {
logger.error("{}", new ExceptionMessage(e));
}
return new FutureTask(task, task);
}
@Override
public Future<?> submit(Runnable task) {
try {
execute(task);
} catch (Exception e) {
logger.error("{}", new ExceptionMessage(e));
}
return new FutureTask(task, task);
}
}