/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#ifndef TENSORFLOW_CORE_DISTRIBUTED_RUNTIME_CANCELLABLE_CALL_H_
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#define TENSORFLOW_CORE_DISTRIBUTED_RUNTIME_CANCELLABLE_CALL_H_
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#include <string>
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#include "tensorflow/core/distributed_runtime/call_options.h"
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#include "tensorflow/core/distributed_runtime/worker_cache.h"
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#include "tensorflow/core/framework/cancellation.h"
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#include "tensorflow/core/platform/mutex.h"
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namespace tensorflow {
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// Supports client side cancellation of WorkerInterface calls via
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// registration with a CancellationManager.
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class CancellableCall {
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public:
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CancellableCall(CancellationManager* cancel_mgr, const string& remote_worker,
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WorkerCacheInterface* wc)
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: cancel_mgr_(cancel_mgr),
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remote_worker_(remote_worker),
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wc_(wc),
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wi_(wc_->CreateWorker(remote_worker_)) {}
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virtual ~CancellableCall() { wc_->ReleaseWorker(remote_worker_, wi_); }
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virtual void IssueCall(const StatusCallback& done) = 0;
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void Start(const StatusCallback& done) {
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CancellationToken token = cancel_mgr_->get_cancellation_token();
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const bool not_yet_cancelled = cancel_mgr_->RegisterCallback(
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token, [this, token]() { opts_.StartCancel(); });
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if (not_yet_cancelled) {
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IssueCall([this, token, done](const Status& s) {
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cancel_mgr_->DeregisterCallback(token);
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done(s);
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});
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} else {
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done(errors::Cancelled("RPC Request was cancelled"));
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}
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}
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protected:
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mutable mutex mu_;
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CancellationManager* const cancel_mgr_; // Not owned
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const string remote_worker_;
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WorkerCacheInterface* const wc_; // Not owned
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WorkerInterface* const wi_; // Owned by wc_, must be released.
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CallOptions opts_;
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};
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} // namespace tensorflow
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#endif // TENSORFLOW_CORE_DISTRIBUTED_RUNTIME_CANCELLABLE_CALL_H_
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