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ExampleSubscriber.cpp
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// Copyright (c) Facebook, Inc. and its affiliates.
//
// 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.
#include "rsocket/examples/util/ExampleSubscriber.h"
#include <iostream>
using namespace ::rsocket;
namespace rsocket_example {
ExampleSubscriber::~ExampleSubscriber() {
LOG(INFO) << "ExampleSubscriber destroy " << this;
}
ExampleSubscriber::ExampleSubscriber(int initialRequest, int numToTake)
: initialRequest_(initialRequest),
thresholdForRequest_(initialRequest * 0.75),
numToTake_(numToTake),
received_(0) {
LOG(INFO) << "ExampleSubscriber " << this << " created with => "
<< " Initial Request: " << initialRequest
<< " Threshold for re-request: " << thresholdForRequest_
<< " Num to Take: " << numToTake;
}
void ExampleSubscriber::onSubscribe(
std::shared_ptr<yarpl::flowable::Subscription> subscription) noexcept {
LOG(INFO) << "ExampleSubscriber " << this << " onSubscribe, requesting "
<< initialRequest_;
subscription_ = std::move(subscription);
requested_ = initialRequest_;
subscription_->request(initialRequest_);
}
void ExampleSubscriber::onNext(Payload element) noexcept {
LOG(INFO) << "ExampleSubscriber " << this
<< " onNext as string: " << element.moveDataToString();
received_++;
if (--requested_ == thresholdForRequest_) {
int toRequest = (initialRequest_ - thresholdForRequest_);
LOG(INFO) << "ExampleSubscriber " << this << " requesting " << toRequest
<< " more items";
requested_ += toRequest;
subscription_->request(toRequest);
};
if (received_ == numToTake_) {
LOG(INFO) << "ExampleSubscriber " << this << " cancelling after receiving "
<< received_ << " items.";
subscription_->cancel();
}
}
void ExampleSubscriber::onComplete() noexcept {
LOG(INFO) << "ExampleSubscriber " << this << " onComplete";
terminated_ = true;
terminalEventCV_.notify_all();
}
void ExampleSubscriber::onError(folly::exception_wrapper ex) noexcept {
LOG(ERROR) << "ExampleSubscriber " << this << " onError: " << ex;
terminated_ = true;
terminalEventCV_.notify_all();
}
void ExampleSubscriber::awaitTerminalEvent() {
LOG(INFO) << "ExampleSubscriber " << this << " block thread";
// now block this thread
std::unique_lock<std::mutex> lk(m_);
// if shutdown gets implemented this would then be released by it
terminalEventCV_.wait(lk, [this] { return terminated_; });
LOG(INFO) << "ExampleSubscriber " << this << " unblocked";
}
} // namespace rsocket_example