mirror of https://gitee.com/bigwinds/arangodb
444 lines
14 KiB
C++
444 lines
14 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief job manager
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014-2015 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 Jan Steemann
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/// @author Copyright 2014-2015, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2004-2014, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "AsyncJobManager.h"
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#include "Basics/ReadLocker.h"
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#include "Basics/WriteLocker.h"
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#include "Basics/logging.h"
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#include "HttpServer/HttpHandler.h"
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#include "HttpServer/HttpServerJob.h"
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using namespace triagens::basics;
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using namespace triagens::rest;
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using namespace std;
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// -----------------------------------------------------------------------------
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// --SECTION-- class AsyncCallbackContext
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief AsyncCallbackContext
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////////////////////////////////////////////////////////////////////////////////
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class triagens::rest::AsyncCallbackContext {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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AsyncCallbackContext (string const& coordHeader)
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: _coordHeader(coordHeader),
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_response(nullptr) {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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~AsyncCallbackContext () {
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if (_response != nullptr) {
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delete _response;
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the coordinator header
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////////////////////////////////////////////////////////////////////////////////
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string& getCoordinatorHeader () {
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return _coordHeader;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief coordinator header
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////////////////////////////////////////////////////////////////////////////////
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string _coordHeader;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief http response
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////////////////////////////////////////////////////////////////////////////////
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HttpResponse* _response;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- class AsyncJobResult
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor for an unspecified job result
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////////////////////////////////////////////////////////////////////////////////
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AsyncJobResult::AsyncJobResult ()
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: _jobId(0),
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_response(nullptr),
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_stamp(0.0),
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_status(JOB_UNDEFINED),
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_ctx(nullptr) {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor for a specific job result
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////////////////////////////////////////////////////////////////////////////////
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AsyncJobResult::AsyncJobResult (IdType jobId,
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HttpResponse* response,
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double stamp,
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Status status,
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AsyncCallbackContext* ctx)
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: _jobId(jobId),
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_response(response),
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_stamp(stamp),
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_status(status),
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_ctx(ctx) {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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AsyncJobResult::~AsyncJobResult () {
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- class AsyncJobManager
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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AsyncJobManager::AsyncJobManager (generate_fptr idFunc, callback_fptr callback)
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: _lock(),
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_jobs(),
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generate(idFunc),
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callback(callback) {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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AsyncJobManager::~AsyncJobManager () {
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// remove all results that haven't been fetched
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deleteJobResults();
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns the result of an async job
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////////////////////////////////////////////////////////////////////////////////
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HttpResponse* AsyncJobManager::getJobResult (AsyncJobResult::IdType jobId,
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AsyncJobResult::Status& status,
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bool removeFromList) {
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WRITE_LOCKER(_lock);
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auto it = _jobs.find(jobId);
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if (it == _jobs.end()) {
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status = AsyncJobResult::JOB_UNDEFINED;
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return nullptr;
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}
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HttpResponse* response = (*it).second._response;
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status = (*it).second._status;
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if (status == AsyncJobResult::JOB_PENDING) {
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return nullptr;
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}
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if (! removeFromList) {
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return nullptr;
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}
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// remove the job from the list
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_jobs.erase(it);
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return response;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief deletes the result of an async job
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////////////////////////////////////////////////////////////////////////////////
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bool AsyncJobManager::deleteJobResult (AsyncJobResult::IdType jobId) {
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WRITE_LOCKER(_lock);
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auto it = _jobs.find(jobId);
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if (it == _jobs.end()) {
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return false;
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}
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HttpResponse* response = (*it).second._response;
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if (response != nullptr) {
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delete response;
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}
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// remove the job from the list
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_jobs.erase(it);
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief deletes all results
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////////////////////////////////////////////////////////////////////////////////
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void AsyncJobManager::deleteJobResults () {
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WRITE_LOCKER(_lock);
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auto it = _jobs.begin();
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while (it != _jobs.end()) {
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HttpResponse* response = (*it).second._response;
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if (response != nullptr) {
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delete response;
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}
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++it;
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}
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_jobs.clear();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief deletes expired results
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////////////////////////////////////////////////////////////////////////////////
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void AsyncJobManager::deleteExpiredJobResults (double stamp) {
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WRITE_LOCKER(_lock);
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auto it = _jobs.begin();
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while (it != _jobs.end()) {
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AsyncJobResult ajr = (*it).second;
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if (ajr._stamp < stamp) {
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HttpResponse* response = ajr._response;
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if (response != nullptr) {
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delete response;
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}
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_jobs.erase(it++);
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}
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else {
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++it;
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns the list of pending jobs
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////////////////////////////////////////////////////////////////////////////////
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const vector<AsyncJobResult::IdType> AsyncJobManager::pending (size_t maxCount) {
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return byStatus(AsyncJobResult::JOB_PENDING, maxCount);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns the list of done jobs
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////////////////////////////////////////////////////////////////////////////////
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const vector<AsyncJobResult::IdType> AsyncJobManager::done (size_t maxCount) {
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return byStatus(AsyncJobResult::JOB_DONE, maxCount);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns the list of jobs by status
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////////////////////////////////////////////////////////////////////////////////
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const vector<AsyncJobResult::IdType> AsyncJobManager::byStatus (AsyncJobResult::Status status,
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size_t maxCount) {
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vector<AsyncJobResult::IdType> jobs;
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{
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size_t n = 0;
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READ_LOCKER(_lock);
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auto it = _jobs.begin();
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// iterate the list. the list is sorted by id
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while (it != _jobs.end()) {
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AsyncJobResult::IdType jobId = (*it).first;
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if ((*it).second._status == status) {
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jobs.emplace_back(jobId);
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if (++n >= maxCount) {
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break;
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}
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}
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++it;
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}
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}
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return jobs;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initializes an async job
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////////////////////////////////////////////////////////////////////////////////
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void AsyncJobManager::initAsyncJob (HttpServerJob* job, uint64_t* jobId) {
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if (jobId == nullptr) {
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return;
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}
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TRI_ASSERT(job != nullptr);
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*jobId = generate();
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job->setId(*jobId);
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AsyncCallbackContext* ctx = nullptr;
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bool found;
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char const* hdr = job->handler()->getRequest()->header("x-arango-coordinator", found);
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if (found) {
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LOG_DEBUG("Found header X-Arango-Coordinator in async request");
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ctx = new AsyncCallbackContext(string(hdr));
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}
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AsyncJobResult ajr(*jobId,
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nullptr,
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TRI_microtime(),
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AsyncJobResult::JOB_PENDING,
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ctx);
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WRITE_LOCKER(_lock);
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_jobs.emplace(*jobId, ajr);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief finishes the execution of an async job
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////////////////////////////////////////////////////////////////////////////////
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void AsyncJobManager::finishAsyncJob (HttpServerJob* job) {
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TRI_ASSERT(job != nullptr);
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HttpHandler* handler = job->handler();
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TRI_ASSERT(handler != nullptr);
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AsyncJobResult::IdType jobId = job->id();
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if (jobId == 0) {
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return;
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}
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double const now = TRI_microtime();
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AsyncCallbackContext* ctx = nullptr;
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HttpResponse* response = nullptr;
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{
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WRITE_LOCKER(_lock);
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auto it = _jobs.find(jobId);
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if (it == _jobs.end()) {
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// job is already deleted.
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// do nothing here. the dispatcher will throw away the handler,
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// which will also dispose the response
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return;
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}
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else {
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response = handler->stealResponse();
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(*it).second._response = response;
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(*it).second._status = AsyncJobResult::JOB_DONE;
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(*it).second._stamp = now;
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ctx = (*it).second._ctx;
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if (ctx != nullptr) {
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// we have found a context object, so we can immediately remove the job
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// from the list of "done" jobs
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_jobs.erase(it);
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}
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}
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}
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// If we got here, then we have stolen the pointer to the response
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// If there is a callback context, the job is no longer in the
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// list of "done" jobs, so we have to free the response and the
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// callback context:
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if (nullptr != ctx && nullptr != callback) {
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callback(ctx->getCoordinatorHeader(), response);
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delete ctx;
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if (response != nullptr) {
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delete response;
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}
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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