mirror of https://gitee.com/bigwinds/arangodb
117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2018 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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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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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Andreas Streichardt
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////////////////////////////////////////////////////////////////////////////////
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#include "AgencyCallbackRegistry.h"
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#include <ctime>
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#include <velocypack/Slice.h>
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#include <velocypack/velocypack-aliases.h>
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#include "Basics/Exceptions.h"
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#include "Basics/ReadLocker.h"
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#include "Basics/WriteLocker.h"
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#include "Cluster/ServerState.h"
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#include "Endpoint/Endpoint.h"
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#include "Logger/Logger.h"
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#include "Random/RandomGenerator.h"
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using namespace arangodb;
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AgencyCallbackRegistry::AgencyCallbackRegistry(std::string const& callbackBasePath)
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: _agency(), _callbackBasePath(callbackBasePath) {}
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AgencyCallbackRegistry::~AgencyCallbackRegistry() {}
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bool AgencyCallbackRegistry::registerCallback(std::shared_ptr<AgencyCallback> cb) {
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uint32_t rand;
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{
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WRITE_LOCKER(locker, _lock);
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while (true) {
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rand = RandomGenerator::interval(UINT32_MAX);
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if (_endpoints.emplace(rand, cb).second) {
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break;
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}
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}
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}
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bool ok = false;
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try {
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ok = _agency.registerCallback(cb->key, getEndpointUrl(rand)).successful();
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if (!ok) {
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LOG_TOPIC("b88f4", ERR, Logger::CLUSTER) << "Registering callback failed";
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}
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} catch (std::exception const& e) {
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LOG_TOPIC("f5330", ERR, Logger::CLUSTER) << "Couldn't register callback " << e.what();
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} catch (...) {
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LOG_TOPIC("1d24f", ERR, Logger::CLUSTER)
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<< "Couldn't register callback. Unknown exception";
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}
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if (!ok) {
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WRITE_LOCKER(locker, _lock);
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_endpoints.erase(rand);
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}
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return ok;
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}
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std::shared_ptr<AgencyCallback> AgencyCallbackRegistry::getCallback(uint32_t id) {
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READ_LOCKER(locker, _lock);
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auto it = _endpoints.find(id);
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if (it == _endpoints.end()) {
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return nullptr;
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}
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return (*it).second;
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}
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bool AgencyCallbackRegistry::unregisterCallback(std::shared_ptr<AgencyCallback> cb) {
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bool found = false;
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uint32_t endpointToDelete = 0;
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{
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READ_LOCKER(locker, _lock);
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for (auto const& it : _endpoints) {
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if (it.second.get() == cb.get()) {
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_agency.unregisterCallback(cb->key, getEndpointUrl(it.first));
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endpointToDelete = it.first;
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found = true;
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break;
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}
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}
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}
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if (found) {
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WRITE_LOCKER(locker, _lock);
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_endpoints.erase(endpointToDelete);
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return true;
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}
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return false;
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}
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std::string AgencyCallbackRegistry::getEndpointUrl(uint32_t endpoint) {
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std::stringstream url;
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url << Endpoint::uriForm(ServerState::instance()->getEndpoint())
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<< _callbackBasePath << "/" << endpoint;
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return url.str();
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}
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