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// 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 io.grpc.CallOptions;
import io.grpc.ClientCall;
import io.grpc.ManagedChannel;
import io.grpc.MethodDescriptor;
import io.netty.util.AbstractReferenceCounted;
import io.netty.util.ReferenceCounted;
import java.util.concurrent.TimeUnit;
/** A wrapper around a {@link io.grpc.ManagedChannel} exposing a reference count.
* When instantiated the reference count is 1. {@link ManagedChannel#shutdown()} will be called
* on the wrapped channel when the reference count reaches 0.
*
* See {@link ReferenceCounted} for more information about reference counting.
*/
class ReferenceCountedChannel extends ManagedChannel implements ReferenceCounted {
private final ManagedChannel channel;
private final AbstractReferenceCounted referenceCounted = new AbstractReferenceCounted() {
@Override
protected void deallocate() {
channel.shutdown();
}
@Override
public ReferenceCounted touch(Object o) {
return this;
}
};
public ReferenceCountedChannel(ManagedChannel channel) {
this.channel = channel;
}
@Override
public ManagedChannel shutdown() {
throw new UnsupportedOperationException("Don't call shutdown() directly, but use release() "
+ "instead.");
}
@Override
public boolean isShutdown() {
return channel.isShutdown();
}
@Override
public boolean isTerminated() {
return channel.isTerminated();
}
@Override
public ManagedChannel shutdownNow() {
throw new UnsupportedOperationException("Don't call shutdownNow() directly, but use release() "
+ "instead.");
}
@Override
public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
return channel.awaitTermination(l, timeUnit);
}
@Override
public <RequestT, ResponseT> ClientCall<RequestT, ResponseT> newCall(
MethodDescriptor<RequestT, ResponseT> methodDescriptor, CallOptions callOptions) {
return channel.<RequestT, ResponseT>newCall(methodDescriptor, callOptions);
}
@Override
public String authority() {
return channel.authority();
}
@Override
public int refCnt() {
return referenceCounted.refCnt();
}
@Override
public ReferenceCountedChannel retain() {
referenceCounted.retain();
return this;
}
@Override
public ReferenceCountedChannel retain(int increment) {
referenceCounted.retain(increment);
return this;
}
@Override
public ReferenceCounted touch() {
referenceCounted.touch();
return this;
}
@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);
}
}
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