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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.android;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.devtools.build.android.AndroidResourceMerger.MergingException;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.ExecutionException;
/** Aggregates a list of failed {@link ListenableFuture} and throws it as an exception. */
class FailedFutureAggregator<T extends Throwable> {
private ExceptionFactory<T> exceptionFactory;
interface ExceptionFactory<T extends Throwable> {
T create();
}
public static FailedFutureAggregator<IOException> forIOExceptionsWithMessage(
final String message) {
return new FailedFutureAggregator<IOException>(
new ExceptionFactory<IOException>() {
@Override
public IOException create() {
return new IOException(message);
}
});
}
public static FailedFutureAggregator<MergingException> createForMergingExceptionWithMessage(
final String message) {
return new FailedFutureAggregator<>(
new ExceptionFactory<MergingException>() {
@Override
public MergingException create() {
return MergingException.withMessage(message);
}
});
}
private FailedFutureAggregator(ExceptionFactory<T> exceptionFactory) {
this.exceptionFactory = exceptionFactory;
}
/** Iterates a list of futures, throwing an Exception if any have failed. */
public <V> void aggregateAndMaybeThrow(List<? extends ListenableFuture<? extends V>> tasks)
throws T {
// Retrieve all the exceptions and wrap them in an IOException.
T exception = null;
for (ListenableFuture<?> task : tasks) {
try {
task.get();
} catch (ExecutionException | InterruptedException e) {
// Lazy exception creation to avoid creating an unused Exception.
if (exception == null) {
exception = exceptionFactory.create();
}
exception.addSuppressed(e.getCause() != null ? e.getCause() : e);
}
}
if (exception != null) {
throw exception;
}
}
}
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