| /* |
| * Copyright (C) 2021 The Android Open Source Project |
| * |
| * 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.android.internal.inputmethod; |
| |
| import android.annotation.AnyThread; |
| import android.annotation.DurationMillisLong; |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.util.Log; |
| |
| import java.util.concurrent.CancellationException; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.CompletionException; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * A set of helper methods to retrieve result values from {@link CompletableFuture}. |
| */ |
| public final class CompletableFutureUtil { |
| /** |
| * Not intended to be instantiated. |
| */ |
| private CompletableFutureUtil() { |
| } |
| |
| @AnyThread |
| @Nullable |
| private static <T> T getValueOrRethrowErrorInternal(@NonNull CompletableFuture<T> future) { |
| boolean interrupted = false; |
| try { |
| while (true) { |
| try { |
| return future.get(); |
| } catch (ExecutionException e) { |
| final Throwable cause = e.getCause(); |
| throw new RuntimeException(cause.getMessage(), cause.getCause()); |
| } catch (InterruptedException e) { |
| interrupted = true; |
| } |
| } |
| } finally { |
| if (interrupted) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| |
| @AnyThread |
| @Nullable |
| private static <T> T getValueOrNullInternal(@NonNull CompletableFuture<T> future, |
| @Nullable String tag, @Nullable String methodName, |
| @DurationMillisLong long timeoutMillis, @Nullable CancellationGroup cancellationGroup) { |
| // We intentionally do not use CompletableFuture.anyOf() to avoid additional object |
| // allocations. |
| final boolean needsToUnregister = cancellationGroup != null |
| && cancellationGroup.tryRegisterFutureOrCancelImmediately(future); |
| boolean interrupted = false; |
| try { |
| while (true) { |
| try { |
| return future.get(timeoutMillis, TimeUnit.MILLISECONDS); |
| } catch (CompletionException e) { |
| if (e.getCause() instanceof CancellationException) { |
| logCancellationInternal(tag, methodName); |
| return null; |
| } |
| logErrorInternal(tag, methodName, e.getMessage()); |
| return null; |
| } catch (CancellationException e) { |
| logCancellationInternal(tag, methodName); |
| return null; |
| } catch (InterruptedException e) { |
| interrupted = true; |
| } catch (TimeoutException e) { |
| logTimeoutInternal(tag, methodName, timeoutMillis); |
| return null; |
| } catch (Throwable e) { |
| logErrorInternal(tag, methodName, e.getMessage()); |
| return null; |
| } |
| } |
| } finally { |
| if (needsToUnregister) { |
| cancellationGroup.unregisterFuture(future); |
| } |
| if (interrupted) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| |
| @AnyThread |
| private static void logTimeoutInternal(@Nullable String tag, @Nullable String methodName, |
| @DurationMillisLong long timeout) { |
| if (tag == null || methodName == null) { |
| return; |
| } |
| Log.w(tag, methodName + " didn't respond in " + timeout + " msec."); |
| } |
| |
| @AnyThread |
| private static void logErrorInternal(@Nullable String tag, @Nullable String methodName, |
| @Nullable String errorString) { |
| if (tag == null || methodName == null) { |
| return; |
| } |
| Log.w(tag, methodName + " was failed with an exception=" + errorString); |
| } |
| |
| @AnyThread |
| private static void logCancellationInternal(@Nullable String tag, @Nullable String methodName) { |
| if (tag == null || methodName == null) { |
| return; |
| } |
| Log.w(tag, methodName + " was cancelled."); |
| } |
| |
| /** |
| * Return the result of the given {@link CompletableFuture<T>}. |
| * |
| * <p>This method may throw exception is the task is completed with an error.</p> |
| * |
| * @param future the object to extract the result from. |
| * @param <T> type of the result. |
| * @return the result. |
| */ |
| @AnyThread |
| @Nullable |
| public static <T> T getResult(@NonNull CompletableFuture<T> future) { |
| return getValueOrRethrowErrorInternal(future); |
| } |
| |
| /** |
| * Return the result of the given {@link CompletableFuture<Boolean>}. |
| * |
| * <p>This method may throw exception is the task is completed with an error.</p> |
| * |
| * @param future the object to extract the result from. |
| * @return the result. |
| */ |
| @AnyThread |
| public static boolean getBooleanResult(@NonNull CompletableFuture<Boolean> future) { |
| return getValueOrRethrowErrorInternal(future); |
| } |
| |
| /** |
| * Return the result of the given {@link CompletableFuture<Integer>}. |
| * |
| * <p>This method may throw exception is the task is completed with an error.</p> |
| * |
| * @param future the object to extract the result from. |
| * @return the result. |
| */ |
| @AnyThread |
| public static int getIntegerResult(@NonNull CompletableFuture<Integer> future) { |
| return getValueOrRethrowErrorInternal(future); |
| } |
| |
| /** |
| * Return the result of the given {@link CompletableFuture<Boolean>}. |
| * |
| * <p>This method is agnostic to {@link Thread#interrupt()}.</p> |
| * |
| * <p>CAVEAT: when {@code cancellationGroup} is specified and it is signalled, {@code future} |
| * will be cancelled permanently. You have to duplicate the {@link CompletableFuture} if you |
| * want to avoid this side-effect.</p> |
| * |
| * @param future the object to extract the result from. |
| * @param tag tag name for logging. Pass {@code null} to disable logging. |
| * @param methodName method name for logging. Pass {@code null} to disable logging. |
| * @param cancellationGroup an optional {@link CancellationGroup} to cancel {@code future} |
| * object. Can be {@code null}. |
| * @param timeoutMillis length of the timeout in millisecond. |
| * @return the result if it is completed within the given timeout. {@code false} otherwise. |
| */ |
| @AnyThread |
| public static boolean getResultOrFalse(@NonNull CompletableFuture<Boolean> future, |
| @Nullable String tag, @Nullable String methodName, |
| @Nullable CancellationGroup cancellationGroup, |
| @DurationMillisLong long timeoutMillis) { |
| final Boolean obj = getValueOrNullInternal(future, tag, methodName, timeoutMillis, |
| cancellationGroup); |
| return obj != null ? obj : false; |
| } |
| |
| /** |
| * Return the result of the given {@link CompletableFuture<Integer>}. |
| * |
| * <p>This method is agnostic to {@link Thread#interrupt()}.</p> |
| * |
| * <p>CAVEAT: when {@code cancellationGroup} is specified and it is signalled, {@code future} |
| * will be cancelled permanently. You have to duplicate the {@link CompletableFuture} if you |
| * want to avoid this side-effect.</p> |
| * |
| * @param future the object to extract the result from. |
| * @param tag tag name for logging. Pass {@code null} to disable logging. |
| * @param methodName method name for logging. Pass {@code null} to disable logging. |
| * @param cancellationGroup an optional {@link CancellationGroup} to cancel {@code future} |
| * object. Can be {@code null}. |
| * @param timeoutMillis length of the timeout in millisecond. |
| * @return the result if it is completed within the given timeout. {@code 0} otherwise. |
| */ |
| @AnyThread |
| public static int getResultOrZero(@NonNull CompletableFuture<Integer> future, |
| @Nullable String tag, @Nullable String methodName, |
| @Nullable CancellationGroup cancellationGroup, @DurationMillisLong long timeoutMillis) { |
| final Integer obj = getValueOrNullInternal(future, tag, methodName, timeoutMillis, |
| cancellationGroup); |
| return obj != null ? obj : 0; |
| } |
| |
| /** |
| * Return the result of the given {@link CompletableFuture<T>}. |
| * |
| * <p>This method is agnostic to {@link Thread#interrupt()}.</p> |
| * |
| * <p>CAVEAT: when {@code cancellationGroup} is specified and it is signalled, {@code future} |
| * will be cancelled permanently. You have to duplicate the {@link CompletableFuture} if you |
| * want to avoid this side-effect.</p> |
| * |
| * @param future the object to extract the result from. |
| * @param tag tag name for logging. Pass {@code null} to disable logging. |
| * @param methodName method name for logging. Pass {@code null} to disable logging. |
| * @param cancellationGroup an optional {@link CancellationGroup} to cancel {@code future} |
| * object. Can be {@code null}. |
| * @param timeoutMillis length of the timeout in millisecond. |
| * @param <T> Type of the result. |
| * @return the result if it is completed within the given timeout. {@code null} otherwise. |
| */ |
| @AnyThread |
| @Nullable |
| public static <T> T getResultOrNull(@NonNull CompletableFuture<T> future, @Nullable String tag, |
| @Nullable String methodName, @Nullable CancellationGroup cancellationGroup, |
| @DurationMillisLong long timeoutMillis) { |
| return getValueOrNullInternal(future, tag, methodName, timeoutMillis, cancellationGroup); |
| } |
| } |