com.google.cloud.GrpcTransportOptions Maven / Gradle / Ivy
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/*
* Copyright 2016 Google Inc. 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.cloud;
import static com.google.common.base.MoreObjects.firstNonNull;
import com.google.api.gax.core.FixedCredentialsProvider;
import com.google.api.gax.core.RetrySettings;
import com.google.api.gax.grpc.ChannelProvider;
import com.google.api.gax.grpc.InstantiatingChannelProvider;
import com.google.api.gax.grpc.UnaryCallSettings;
import com.google.auth.Credentials;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import io.grpc.internal.SharedResourceHolder;
import io.grpc.internal.SharedResourceHolder.Resource;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Objects;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Class representing service options for those services that use gRPC as the transport
* layer.
*/
public class GrpcTransportOptions implements TransportOptions {
private static final long serialVersionUID = -9049538465533951165L;
private final String executorFactoryClassName;
private transient ExecutorFactory executorFactory;
/**
* Shared thread pool executor.
*/
private static final Resource EXECUTOR =
new Resource() {
@Override
public ScheduledExecutorService create() {
ScheduledThreadPoolExecutor service = new ScheduledThreadPoolExecutor(8);
service.setKeepAliveTime(5, TimeUnit.SECONDS);
service.allowCoreThreadTimeOut(true);
service.setRemoveOnCancelPolicy(true);
return service;
}
@Override
public void close(ScheduledExecutorService instance) {
instance.shutdown();
}
};
/**
* An interface for {@link ExecutorService} factories. Implementations of this interface can be
* used to provide an user-defined executor to execute requests. Any implementation of this
* interface must override the {@code get()} method to return the desired executor. The
* {@code release(executor)} method should be overriden to free resources used by the executor (if
* needed) according to application's logic.
*
* Implementation must provide a public no-arg constructor. Loading of a factory implementation
* is done via {@link java.util.ServiceLoader}.
*
* @param the {@link ExecutorService} subclass created by this factory
*/
public interface ExecutorFactory {
/**
* Gets an executor service instance.
*/
T get();
/**
* Releases resources used by the executor and possibly shuts it down.
*/
void release(T executor);
}
@VisibleForTesting
static class DefaultExecutorFactory implements ExecutorFactory {
private static final DefaultExecutorFactory INSTANCE = new DefaultExecutorFactory();
@Override
public ScheduledExecutorService get() {
return SharedResourceHolder.get(EXECUTOR);
}
@Override
public synchronized void release(ScheduledExecutorService executor) {
SharedResourceHolder.release(EXECUTOR, executor);
}
}
/**
* Builder for {@code GrpcTransportOptions}.
*/
public static class Builder {
private ExecutorFactory executorFactory;
private Builder() {}
private Builder(GrpcTransportOptions options) {
executorFactory = options.executorFactory;
}
public GrpcTransportOptions build() {
return new GrpcTransportOptions(this);
}
/**
* Sets the scheduled executor factory. This method can be used to provide an user-defined
* scheduled executor to execute requests.
*
* @return the builder
*/
public Builder setExecutorFactory(ExecutorFactory executorFactory) {
this.executorFactory = executorFactory;
return this;
}
}
@SuppressWarnings("unchecked")
private GrpcTransportOptions(Builder builder) {
executorFactory = firstNonNull(builder.executorFactory,
ServiceOptions.getFromServiceLoader(ExecutorFactory.class, DefaultExecutorFactory.INSTANCE));
executorFactoryClassName = executorFactory.getClass().getName();
}
/**
* Returns a scheduled executor service provider.
*/
public ExecutorFactory getExecutorFactory() {
return executorFactory;
}
/**
* Returns a builder for API call settings.
*/
public UnaryCallSettings.Builder getApiCallSettings(RetrySettings retrySettings) {
return UnaryCallSettings.newBuilder().setRetrySettingsBuilder(retrySettings.toBuilder());
}
/**
* Returns a channel provider from the given default provider.
*/
public static ChannelProvider setUpChannelProvider(
InstantiatingChannelProvider.Builder providerBuilder, ServiceOptions serviceOptions) {
providerBuilder.setEndpoint(serviceOptions.getHost())
.setClientLibHeader(ServiceOptions.getGoogApiClientLibName(),
firstNonNull(serviceOptions.getLibraryVersion(), ""));
Credentials scopedCredentials = serviceOptions.getScopedCredentials();
if (scopedCredentials != null && scopedCredentials != NoCredentials.getInstance()) {
providerBuilder.setCredentialsProvider(FixedCredentialsProvider.create(scopedCredentials));
}
return providerBuilder.build();
}
public Builder toBuilder() {
return new Builder(this);
}
@Override
public int hashCode() {
return Objects.hash(executorFactoryClassName);
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
GrpcTransportOptions other = (GrpcTransportOptions) obj;
return Objects.equals(executorFactoryClassName, other.executorFactoryClassName);
}
private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {
input.defaultReadObject();
executorFactory = ServiceOptions.newInstance(executorFactoryClassName);
}
public static Builder newBuilder() {
return new Builder();
}
}