| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.hadoop.fs.s3a.impl; |
| |
| import javax.annotation.Nullable; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CancellationException; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.CompletionException; |
| import java.util.concurrent.Executor; |
| import java.util.function.Supplier; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.hadoop.fs.impl.WrappedIOException; |
| import org.apache.hadoop.util.DurationInfo; |
| |
| import static org.apache.hadoop.fs.impl.FutureIOSupport.raiseInnerCause; |
| |
| /** |
| * A bridge from Callable to Supplier; catching exceptions |
| * raised by the callable and wrapping them as appropriate. |
| * @param <T> return type. |
| */ |
| public final class CallableSupplier<T> implements Supplier { |
| |
| private static final Logger LOG = |
| LoggerFactory.getLogger(CallableSupplier.class); |
| |
| private final Callable<T> call; |
| |
| /** |
| * Create. |
| * @param call call to invoke. |
| */ |
| public CallableSupplier(final Callable<T> call) { |
| this.call = call; |
| } |
| |
| @Override |
| public Object get() { |
| try { |
| return call.call(); |
| } catch (RuntimeException e) { |
| throw e; |
| } catch (IOException e) { |
| throw new WrappedIOException(e); |
| } catch (Exception e) { |
| throw new WrappedIOException(new IOException(e)); |
| } |
| } |
| |
| /** |
| * Submit a callable into a completable future. |
| * RTEs are rethrown. |
| * Non RTEs are caught and wrapped; IOExceptions to |
| * {@link WrappedIOException} instances. |
| * @param executor executor. |
| * @param call call to invoke |
| * @param <T> type |
| * @return the future to wait for |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> CompletableFuture<T> submit( |
| final Executor executor, |
| final Callable<T> call) { |
| return CompletableFuture.supplyAsync( |
| new CallableSupplier<T>(call), executor); |
| } |
| |
| /** |
| * Wait for a list of futures to complete. If the list is empty, |
| * return immediately. |
| * @param futures list of futures. |
| * @throws IOException if one of the called futures raised an IOE. |
| * @throws RuntimeException if one of the futures raised one. |
| */ |
| public static <T> void waitForCompletion( |
| final List<CompletableFuture<T>> futures) |
| throws IOException { |
| if (futures.isEmpty()) { |
| return; |
| } |
| // await completion |
| waitForCompletion(CompletableFuture.allOf( |
| futures.toArray(new CompletableFuture[0]))); |
| } |
| |
| /** |
| * Wait for a single of future to complete, extracting IOEs afterwards. |
| * @param future future to wait for. |
| * @throws IOException if one of the called futures raised an IOE. |
| * @throws RuntimeException if one of the futures raised one. |
| */ |
| public static <T> void waitForCompletion( |
| final CompletableFuture<T> future) |
| throws IOException { |
| try (DurationInfo ignore = |
| new DurationInfo(LOG, false, "Waiting for task completion")) { |
| future.join(); |
| } catch (CancellationException e) { |
| throw new IOException(e); |
| } catch (CompletionException e) { |
| raiseInnerCause(e); |
| } |
| } |
| |
| /** |
| * Wait for a single of future to complete, ignoring exceptions raised. |
| * @param future future to wait for. |
| */ |
| public static <T> void waitForCompletionIgnoringExceptions( |
| @Nullable final CompletableFuture<T> future) { |
| if (future != null) { |
| try (DurationInfo ignore = |
| new DurationInfo(LOG, false, "Waiting for task completion")) { |
| future.join(); |
| } catch (Exception e) { |
| LOG.debug("Ignoring exception raised in task completion: "); |
| } |
| } |
| } |
| |
| /** |
| * Block awaiting completion for any non-null future passed in; |
| * No-op if a null arg was supplied. |
| * @param future future |
| * @throws IOException if one of the called futures raised an IOE. |
| * @throws RuntimeException if one of the futures raised one. |
| */ |
| public static void maybeAwaitCompletion( |
| @Nullable final CompletableFuture<Void> future) |
| throws IOException { |
| if (future != null) { |
| waitForCompletion(future); |
| } |
| } |
| } |