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Introduce listenablefuture and failureaccess artifacts, plus Internal…
…FutureFailureAccess. (taken over from CL 210155310 to add Maven setup) It provides a direct access to the cause of any failures, so we can avoid unnecessary allocation of an exception. Design discussion: https://docs.google.com/document/d/1_RVTtztq5pqrhs0srvJWHMI7PT1tA71--iaauV2l5UA/edit RELNOTES=Created separate `listenablefuture` and `failureaccess` artifacts, the latter containing the new `InternalFutureFailureAccess`. For more details about `listenablefuture`, see [this announcement](https://groups.google.com/d/topic/guava-announce/Km82fZG68Sw). ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=212516713
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The modules under this directory will be released exactly once each. Once that | ||
happens, there will be no need to ever update any files here. |
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<?xml version="1.0" encoding="UTF-8"?> | ||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> | ||
<modelVersion>4.0.0</modelVersion> | ||
<parent> | ||
<groupId>com.google.guava</groupId> | ||
<artifactId>guava-parent</artifactId> | ||
<version>26.0-android</version> | ||
</parent> | ||
<artifactId>failureaccess</artifactId> | ||
<version>1.0</version> | ||
<name>Guava InternalFutureFailureAccess and InternalFutures</name> | ||
<description> | ||
Contains | ||
com.google.common.util.concurrent.internal.InternalFutureFailureAccess and | ||
InternalFutures. Most users will never need to use this artifact. Its | ||
classes is conceptually a part of Guava, but they're in this separate | ||
artifact so that Android libraries can use them without pulling in all of | ||
Guava (just as they can use ListenableFuture by depending on the | ||
listenablefuture artifact). | ||
</description> | ||
<build> | ||
<plugins> | ||
<plugin> | ||
<artifactId>maven-source-plugin</artifactId> | ||
</plugin> | ||
<plugin> | ||
<groupId>org.codehaus.mojo</groupId> | ||
<artifactId>animal-sniffer-maven-plugin</artifactId> | ||
</plugin> | ||
<plugin> | ||
<artifactId>maven-javadoc-plugin</artifactId> | ||
<executions> | ||
<execution> | ||
<id>attach-docs</id> | ||
</execution> | ||
<execution> | ||
<id>generate-javadoc-site-report</id> | ||
<phase>site</phase> | ||
<goals><goal>javadoc</goal></goals> | ||
</execution> | ||
</executions> | ||
</plugin> | ||
</plugins> | ||
</build> | ||
</project> |
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...ureaccess/src/com/google/common/util/concurrent/internal/InternalFutureFailureAccess.java
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/* | ||
* Copyright (C) 2018 The Guava Authors | ||
* | ||
* 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. | ||
*/ | ||
|
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package com.google.common.util.concurrent.internal; | ||
|
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/** | ||
* A future that, if it fails, may <i>optionally</i> provide access to the cause of the failure. | ||
* | ||
* <p>This class is used only for micro-optimization. Standard {@code Future} utilities benefit from | ||
* this optimization, so there is no need to specialize methods to return or accept this type | ||
* instead of {@code ListenableFuture}. | ||
* | ||
* <p>This class is GWT-compatible. | ||
* | ||
* @since {@code com.google.guava:failureaccess:1.0}, which was added as a dependency of Guava in | ||
* Guava 27.0 | ||
*/ | ||
public abstract class InternalFutureFailureAccess { | ||
/** Constructor for use by subclasses. */ | ||
protected InternalFutureFailureAccess() {} | ||
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/** | ||
* Usually returns {@code null} but, if this {@code Future} has failed, may <i>optionally</i> | ||
* return the cause of the failure. "Failure" means specifically "completed with an exception"; it | ||
* does not include "was cancelled." To be explicit: If this method returns a non-null value, | ||
* then: | ||
* | ||
* <ul> | ||
* <li>{@code isDone()} must return {@code true} | ||
* <li>{@code isCancelled()} must return {@code false} | ||
* <li>{@code get()} must not block, and it must throw an {@code ExecutionException} with the | ||
* return value of this method as its cause | ||
* </ul> | ||
* | ||
* <p>This method is {@code protected} so that classes like {@code | ||
* com.google.common.util.concurrent.SettableFuture} do not expose it to their users as an | ||
* instance method. In the unlikely event that you need to call this method, call {@link | ||
* InternalFutures#tryInternalFastPathGetFailure(InternalFutureFailureAccess)}. | ||
*/ | ||
protected abstract Throwable tryInternalFastPathGetFailure(); | ||
} |
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