89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
// Copyright 2010-2022 Google LLC
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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#include "ortools/math_opt/cpp/message_callback.h"
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#include <memory>
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#include <ostream>
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#include <string>
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#include <vector>
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#include "absl/base/thread_annotations.h"
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#include "absl/strings/string_view.h"
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#include "absl/synchronization/mutex.h"
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#include "ortools/base/logging.h"
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#include "ortools/base/source_location.h"
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namespace operations_research::math_opt {
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namespace {
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class PrinterMessageCallbackImpl {
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public:
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PrinterMessageCallbackImpl(std::ostream& output_stream,
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const absl::string_view prefix)
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: output_stream_(output_stream), prefix_(prefix) {}
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void Call(const std::vector<std::string>& messages) {
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const absl::MutexLock lock(&mutex_);
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for (const std::string& message : messages) {
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output_stream_ << prefix_ << message << '\n';
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}
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output_stream_.flush();
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}
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private:
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absl::Mutex mutex_;
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std::ostream& output_stream_ ABSL_GUARDED_BY(mutex_);
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const std::string prefix_;
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};
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class VectorMessageCallbackImpl {
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public:
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explicit VectorMessageCallbackImpl(std::vector<std::string>* const sink)
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: sink_(ABSL_DIE_IF_NULL(sink)) {}
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void Call(const std::vector<std::string>& messages) {
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const absl::MutexLock lock(&mutex_);
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sink_->insert(sink_->end(), messages.begin(), messages.end());
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}
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private:
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absl::Mutex mutex_;
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std::vector<std::string>* const sink_;
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};
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} // namespace
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MessageCallback PrinterMessageCallback(std::ostream& output_stream,
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const absl::string_view prefix) {
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// Here we must use an std::shared_ptr since std::function requires that its
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// input is copyable. And PrinterMessageCallbackImpl can't be copyable since
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// it uses an absl::Mutex that is not.
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const auto impl =
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std::make_shared<PrinterMessageCallbackImpl>(output_stream, prefix);
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return
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[=](const std::vector<std::string>& messages) { impl->Call(messages); };
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}
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MessageCallback VectorMessageCallback(std::vector<std::string>* sink) {
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CHECK(sink != nullptr);
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// Here we must use an std::shared_ptr since std::function requires that its
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// input is copyable. And VectorMessageCallbackImpl can't be copyable since it
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// uses an absl::Mutex that is not.
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const auto impl = std::make_shared<VectorMessageCallbackImpl>(sink);
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return
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[=](const std::vector<std::string>& messages) { impl->Call(messages); };
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}
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} // namespace operations_research::math_opt
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