com.google.cloud.GrpcServiceOptions 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.cloud.spi.ServiceRpcFactory;
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;
/**
* Abstract class representing service options for those services that use gRPC as the transport
* layer.
*
* @param the service subclass
* @param the spi-layer class corresponding to the service
* @param the {@code ServiceOptions} subclass corresponding to the service
*/
public abstract class GrpcServiceOptions, ServiceRpcT,
OptionsT extends GrpcServiceOptions>
extends ServiceOptions {
private static final long serialVersionUID = 6415982522610509549L;
private final String executorFactoryClassName;
private final int initialTimeout;
private final double timeoutMultiplier;
private final int maxTimeout;
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 GrpcServiceOptions}.
*
* @param the service subclass
* @param the spi-layer class corresponding to the service
* @param the {@code GrpcServiceOptions} subclass corresponding to the service
* @param the {@code ServiceOptions} builder
*/
protected abstract static class Builder, ServiceRpcT,
OptionsT extends GrpcServiceOptions,
B extends Builder>
extends ServiceOptions.Builder {
private ExecutorFactory executorFactory;
private int initialTimeout = 20_000;
private double timeoutMultiplier = 1.5;
private int maxTimeout = 100_000;
protected Builder() {}
protected Builder(GrpcServiceOptions options) {
super(options);
executorFactory = options.executorFactory;
initialTimeout = options.initialTimeout;
timeoutMultiplier = options.timeoutMultiplier;
maxTimeout = options.maxTimeout;
}
@Override
protected abstract GrpcServiceOptions build();
/**
* Sets the scheduled executor factory. This method can be used to provide an user-defined
* scheduled executor to execute requests.
*
* @return the builder
*/
public B executorFactory(ExecutorFactory executorFactory) {
this.executorFactory = executorFactory;
return self();
}
/**
* Sets the timeout for the initial RPC, in milliseconds. Subsequent calls will use this value
* adjusted according to {@link #timeoutMultiplier(double)}. Default value is 20000.
*
* @throws IllegalArgumentException if the provided timeout is < 0
* @return the builder
*/
public B initialTimeout(int initialTimeout) {
Preconditions.checkArgument(initialTimeout > 0, "Initial timeout must be > 0");
this.initialTimeout = initialTimeout;
return self();
}
/**
* Sets the timeout multiplier. This value is used to compute the timeout for a retried RPC.
* Timeout is computed as {@code timeoutMultiplier * previousTimeout}. Default value is 1.5.
*
* @throws IllegalArgumentException if the provided timeout multiplier is < 0
* @return the builder
*/
public B timeoutMultiplier(double timeoutMultiplier) {
Preconditions.checkArgument(timeoutMultiplier >= 1.0, "Timeout multiplier must be >= 1");
this.timeoutMultiplier = timeoutMultiplier;
return self();
}
/**
* Sets the maximum timeout for a RPC call, in milliseconds. Default value is 100000. If
* {@code maxTimeout} is lower than the initial timeout the {@link #initialTimeout(int)} value
* is used instead.
*
* @return the builder
*/
public B maxTimeout(int maxTimeout) {
this.maxTimeout = maxTimeout;
return self();
}
}
@SuppressWarnings("unchecked")
protected GrpcServiceOptions(
Class> serviceFactoryClass,
Class> rpcFactoryClass, Builder builder) {
super(serviceFactoryClass, rpcFactoryClass, builder);
executorFactory = firstNonNull(builder.executorFactory,
getFromServiceLoader(ExecutorFactory.class, DefaultExecutorFactory.INSTANCE));
executorFactoryClassName = executorFactory.getClass().getName();
initialTimeout = builder.initialTimeout;
timeoutMultiplier = builder.timeoutMultiplier;
maxTimeout = builder.maxTimeout <= initialTimeout ? initialTimeout : builder.maxTimeout;
}
/**
* Returns a scheduled executor service provider.
*/
protected ExecutorFactory executorFactory() {
return executorFactory;
}
/**
* Returns the timeout for the initial RPC, in milliseconds. Subsequent calls will use this value
* adjusted according to {@link #timeoutMultiplier()}. Default value is 20000.
*/
public int initialTimeout() {
return initialTimeout;
}
/**
* Returns the timeout multiplier. This values is used to compute the timeout for a RPC. Timeout
* is computed as {@code timeoutMultiplier * previousTimeout}. Default value is 1.5.
*/
public double timeoutMultiplier() {
return timeoutMultiplier;
}
/**
* Returns the maximum timeout for a RPC call, in milliseconds. Default value is 100000.
*/
public int maxTimeout() {
return maxTimeout;
}
@Override
protected int baseHashCode() {
return Objects.hash(super.baseHashCode(), executorFactoryClassName, initialTimeout,
timeoutMultiplier, maxTimeout);
}
protected boolean baseEquals(GrpcServiceOptions other) {
return super.baseEquals(other)
&& Objects.equals(executorFactoryClassName, other.executorFactoryClassName)
&& Objects.equals(initialTimeout, other.initialTimeout)
&& Objects.equals(timeoutMultiplier, other.timeoutMultiplier)
&& Objects.equals(maxTimeout, other.maxTimeout);
}
private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {
input.defaultReadObject();
executorFactory = newInstance(executorFactoryClassName);
}
}