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A continuously growing collection of utilities to measure performance, get better diagnostics,
improve performance, or do things more reliably, faster that other open source libraries...
/*
* Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Additionally licensed with:
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.spf4j.concurrent;
import com.google.common.collect.Maps;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.BiConsumer;
import javax.annotation.CheckReturnValue;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.spf4j.base.Pair;
import org.spf4j.base.Throwables;
import org.spf4j.base.TimeSource;
/**
*
* @author zoly
*/
public final class Futures {
private Futures() { }
@Nullable
@CheckReturnValue
public static RuntimeException cancelAll(final boolean mayInterrupt, final Future... futures) {
return cancelAll(mayInterrupt, futures, 0);
}
@Nullable
@CheckReturnValue
public static RuntimeException cancelAll(final boolean mayInterrupt, final Future[] futures, final int from) {
RuntimeException ex = null;
for (int i = from; i < futures.length; i++) {
Future future = futures[i];
try {
future.cancel(mayInterrupt);
} catch (RuntimeException e) {
if (ex == null) {
ex = e;
} else {
Throwables.suppressLimited(ex, e);
}
}
}
return ex;
}
@Nullable
public static RuntimeException cancelAll(final boolean mayInterrupt, final Iterator> iterator) {
RuntimeException ex = null;
while (iterator.hasNext()) {
Future future = iterator.next();
try {
future.cancel(mayInterrupt);
} catch (RuntimeException e) {
if (ex == null) {
ex = e;
} else {
Throwables.suppressLimited(ex, e);
}
}
}
return ex;
}
@CheckReturnValue
@Nonnull
public static Pair, Exception> getAll(final long timeoutMillis, final Future... futures) {
long deadlineNanos = TimeSource.nanoTime() + TimeUnit.MILLISECONDS.toNanos(timeoutMillis);
return getAllWithDeadlineNanos(deadlineNanos, futures);
}
@CheckReturnValue
@Nonnull
public static Pair, Exception> getAllWithDeadlineNanos(final long deadlineNanos,
final Future... futures) {
Map res = Maps.newHashMapWithExpectedSize(futures.length);
Exception ex = getAllWithDeadlineNanos(deadlineNanos, res::put, futures);
return Pair.of(res, ex);
}
/**
*
* @param deadlineNanos
* @param futures
* @return
*/
@CheckReturnValue
@Nullable
public static Exception getAllWithDeadlineNanos(final long deadlineNanos,
final BiConsumer, T> consumer,
final Future... futures) {
Exception exception = null;
for (int i = 0; i < futures.length; i++) {
Future future = futures[i];
try {
final long toNanos = deadlineNanos - TimeSource.nanoTime();
T get = future.get(Math.max(0, toNanos), TimeUnit.NANOSECONDS);
consumer.accept(future, get);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
if (exception == null) {
exception = ex;
} else {
Throwables.suppressLimited(ex, exception);
exception = ex;
}
RuntimeException cex = cancelAll(true, futures, i + 1);
if (cex != null) {
Throwables.suppressLimited(exception, cex);
}
} catch (TimeoutException ex) {
try {
future.cancel(true);
} catch (RuntimeException ex2) {
ex.addSuppressed(ex2);
}
if (exception == null) {
exception = ex;
} else {
Throwables.suppressLimited(exception, ex);
}
} catch (ExecutionException | RuntimeException ex) {
if (exception == null) {
exception = ex;
} else {
Throwables.suppressLimited(exception, ex);
}
}
}
return exception;
}
/**
* Gets all futures resuls for futures that return Void (no return).
*
* @param deadlineNanos
* @param futures
* @return
*/
@CheckReturnValue
@Nullable
@SuppressWarnings("unchecked")
public static Exception getAllWithDeadlineNanosRetVoid(final long deadlineNanos,
final Future... futures) {
return getAllWithDeadlineNanos(deadlineNanos, (a, b) -> { }, futures);
}
@CheckReturnValue
@Nonnull
public static Pair, Exception> getAll(final long timeoutMillis, final Iterable futures) {
long deadlineNanos = TimeSource.nanoTime() + TimeUnit.MILLISECONDS.toNanos(timeoutMillis);
return getAllWithDeadlineNanos(deadlineNanos, futures);
}
@CheckReturnValue
@Nonnull
public static Pair, Exception> getAllWithDeadlineNanos(final long deadlineNanos,
final Iterable futures) {
Map results;
if (futures instanceof Collection) {
results = Maps.newHashMapWithExpectedSize(((Collection) futures).size());
} else {
results = new HashMap<>();
}
@SuppressWarnings("unchecked")
Exception ex = getAllWithDeadlineNanos(deadlineNanos, results::put, (Iterable) futures);
return Pair.of(results, ex);
}
@CheckReturnValue
@Nullable
public static Exception getAllWithDeadlineNanos(final long deadlineNanos,
final BiConsumer, T> consumer,
final Iterable> futures) {
Exception exception = null;
Iterator> iterator = futures.iterator();
while (iterator.hasNext()) {
Future future = iterator.next();
try {
final long toNanos = deadlineNanos - TimeSource.nanoTime();
T get = future.get(Math.max(0, toNanos), TimeUnit.NANOSECONDS);
consumer.accept(future, get);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
if (exception == null) {
exception = ex;
} else {
Throwables.suppressLimited(ex, exception);
exception = ex;
}
RuntimeException cex = cancelAll(true, (Iterator) iterator);
if (cex != null) {
Throwables.suppressLimited(exception, cex);
}
break;
} catch (TimeoutException ex) {
try {
future.cancel(true);
} catch (RuntimeException ex2) {
ex.addSuppressed(ex2);
}
if (exception == null) {
exception = ex;
} else {
Throwables.suppressLimited(exception, ex);
}
} catch (ExecutionException | RuntimeException ex) {
if (exception == null) {
exception = ex;
} else {
Throwables.suppressLimited(exception, ex);
}
}
}
return exception;
}
public static List> timedOutFutures(final int copies, final TimeoutException ex) {
Future fut = new Future() {
@Override
public boolean cancel(final boolean mayInterruptIfRunning) {
throw new UnsupportedOperationException();
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return true;
}
@Override
public T get() throws ExecutionException {
throw new ExecutionException(ex);
}
@Override
public T get(final long timeout, final TimeUnit unit) throws TimeoutException {
throw ex;
}
};
return Collections.nCopies(copies, fut);
}
}
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