| // Copyright 2018 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.lib.remote; |
| |
| import static com.google.common.util.concurrent.MoreExecutors.directExecutor; |
| |
| import com.google.common.base.Throwables; |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.SettableFuture; |
| import com.google.devtools.build.lib.remote.grpc.ChannelConnectionFactory; |
| import com.google.devtools.build.lib.remote.grpc.ChannelConnectionFactory.ChannelConnection; |
| import com.google.devtools.build.lib.remote.grpc.DynamicConnectionPool; |
| import com.google.devtools.build.lib.remote.grpc.SharedConnectionFactory.SharedConnection; |
| import com.google.devtools.build.lib.remote.util.RxFutures; |
| import com.google.errorprone.annotations.CanIgnoreReturnValue; |
| import io.grpc.Channel; |
| import io.netty.util.AbstractReferenceCounted; |
| import io.netty.util.ReferenceCounted; |
| import io.reactivex.rxjava3.annotations.CheckReturnValue; |
| import io.reactivex.rxjava3.core.Single; |
| import io.reactivex.rxjava3.core.SingleObserver; |
| import io.reactivex.rxjava3.core.SingleSource; |
| import io.reactivex.rxjava3.disposables.Disposable; |
| import io.reactivex.rxjava3.functions.Function; |
| import java.io.IOException; |
| import java.util.concurrent.ExecutionException; |
| |
| /** |
| * A wrapper around a {@link DynamicConnectionPool} exposing {@link Channel} and a reference count. |
| * When instantiated the reference count is 1. {@link DynamicConnectionPool#close()} will be called |
| * on the wrapped channel when the reference count reaches 0. |
| * |
| * <p>See {@link ReferenceCounted} for more information about reference counting. |
| */ |
| public class ReferenceCountedChannel implements ReferenceCounted { |
| private final DynamicConnectionPool dynamicConnectionPool; |
| private final AbstractReferenceCounted referenceCounted = |
| new AbstractReferenceCounted() { |
| @Override |
| protected void deallocate() { |
| try { |
| dynamicConnectionPool.close(); |
| } catch (IOException e) { |
| throw new AssertionError(e.getMessage(), e); |
| } |
| } |
| |
| @Override |
| public ReferenceCounted touch(Object o) { |
| return this; |
| } |
| }; |
| |
| public ReferenceCountedChannel(ChannelConnectionFactory connectionFactory) { |
| this(connectionFactory, /*maxConnections=*/ 0); |
| } |
| |
| public ReferenceCountedChannel(ChannelConnectionFactory connectionFactory, int maxConnections) { |
| this.dynamicConnectionPool = |
| new DynamicConnectionPool( |
| connectionFactory, connectionFactory.maxConcurrency(), maxConnections); |
| } |
| |
| public boolean isShutdown() { |
| return dynamicConnectionPool.isClosed(); |
| } |
| |
| @CheckReturnValue |
| public <T> ListenableFuture<T> withChannelFuture( |
| Function<Channel, ? extends ListenableFuture<T>> source) { |
| return RxFutures.toListenableFuture( |
| withChannel(channel -> RxFutures.toSingle(() -> source.apply(channel), directExecutor()))); |
| } |
| |
| public <T> T withChannelBlocking(Function<Channel, T> source) |
| throws ExecutionException, IOException, InterruptedException { |
| try { |
| return withChannelBlockingGet(source); |
| } catch (ExecutionException e) { |
| Throwable cause = e.getCause(); |
| Throwables.throwIfInstanceOf(cause, IOException.class); |
| Throwables.throwIfUnchecked(cause); |
| throw e; |
| } |
| } |
| |
| // prevents rxjava silent possible wrap of RuntimeException and misinterpretation |
| private <T> T withChannelBlockingGet(Function<Channel, T> source) |
| throws ExecutionException, InterruptedException { |
| SettableFuture<T> future = SettableFuture.create(); |
| withChannel(channel -> Single.just(source.apply(channel))) |
| .subscribe( |
| new SingleObserver<T>() { |
| @Override |
| public void onError(Throwable t) { |
| future.setException(t); |
| } |
| |
| @Override |
| public void onSuccess(T t) { |
| future.set(t); |
| } |
| |
| @Override |
| public void onSubscribe(Disposable d) { |
| future.addListener( |
| () -> { |
| if (future.isCancelled()) { |
| d.dispose(); |
| } |
| }, |
| directExecutor()); |
| } |
| }); |
| return future.get(); |
| } |
| |
| @CheckReturnValue |
| public <T> Single<T> withChannel(Function<Channel, ? extends SingleSource<? extends T>> source) { |
| return dynamicConnectionPool |
| .create() |
| .flatMap( |
| sharedConnection -> |
| Single.using( |
| () -> sharedConnection, |
| conn -> { |
| ChannelConnection connection = |
| (ChannelConnection) sharedConnection.getUnderlyingConnection(); |
| Channel channel = connection.getChannel(); |
| return source.apply(channel); |
| }, |
| SharedConnection::close)); |
| } |
| |
| @Override |
| public int refCnt() { |
| return referenceCounted.refCnt(); |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public ReferenceCountedChannel retain() { |
| referenceCounted.retain(); |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public ReferenceCountedChannel retain(int increment) { |
| referenceCounted.retain(increment); |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public ReferenceCounted touch() { |
| referenceCounted.touch(); |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public ReferenceCounted touch(Object hint) { |
| referenceCounted.touch(hint); |
| return this; |
| } |
| |
| @Override |
| public boolean release() { |
| return referenceCounted.release(); |
| } |
| |
| @Override |
| public boolean release(int decrement) { |
| return referenceCounted.release(decrement); |
| } |
| } |