File indexing completed on 2024-04-28 04:01:22

 /* -*- C++ -*-
     This file implements the Collection class.
 
     SPDX-FileCopyrightText: 2004-2013 Mirko Boehm <mirko@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "collection.h"
 
 #include "collection_p.h"
 #include "debuggingaids.h"
 #include "queueapi.h"
 #include "queueing.h"
 
 #include <QList>
 #include <QObject>
 #include <QPointer>
 
 #include "dependencypolicy.h"
 #include "executewrapper_p.h"
 #include "thread.h"
 
 namespace ThreadWeaver
 {
 class CollectionExecuteWrapper : public ExecuteWrapper
 {
 public:
     CollectionExecuteWrapper()
         : collection(nullptr)
     {
     }
 
     void setCollection(Collection *collection_)
     {
         collection = collection_;
     }
 
     void begin(const JobPointer &job, Thread *thread) override
     {
         TWDEBUG(4, "CollectionExecuteWrapper::begin: collection %p\n", collection);
         ExecuteWrapper::begin(job, thread);
         Q_ASSERT(collection);
         collection->d()->elementStarted(collection, job, thread);
         ExecuteWrapper::begin(job, thread);
     }
 
     void end(const JobPointer &job, Thread *thread) override
     {
         TWDEBUG(4, "CollectionExecuteWrapper::end: collection %p\n", collection);
         Q_ASSERT(collection);
         ExecuteWrapper::end(job, thread);
         collection->d()->elementFinished(collection, job, thread);
     }
 
     bool ownedByJob() const override
     {
         return true;
     }
 
 private:
     ThreadWeaver::Collection *collection;
 };
 
 Collection::Collection()
     : Job(new Private::Collection_Private)
 {
 }
 
 Collection::Collection(Private::Collection_Private *d__)
     : Job(d__)
 {
 }
 
 Collection::~Collection()
 {
     MUTEX_ASSERT_UNLOCKED(mutex());
     // dequeue all remaining jobs:
     QMutexLocker l(mutex());
     Q_UNUSED(l);
     if (d()->api != nullptr) { // still queued
         d()->dequeueElements(this, false);
     }
 }
 
 void Collection::addJob(JobPointer job)
 {
     QMutexLocker l(mutex());
     Q_UNUSED(l);
     REQUIRE(d()->api == nullptr || d()->selfIsExecuting == true); // not queued yet or still running
     REQUIRE(job != nullptr);
 
     CollectionExecuteWrapper *wrapper = new CollectionExecuteWrapper();
     wrapper->setCollection(this);
     wrapper->wrap(job->setExecutor(wrapper));
     d()->elements.append(job);
 }
 
 void Collection::stop()
 {
     d()->stop(this);
 }
 
 void Collection::requestAbort()
 {
     Job::requestAbort();
     d()->requestAbort(this);
 }
 
 void Collection::aboutToBeQueued_locked(QueueAPI *api)
 {
     Q_ASSERT(!mutex()->tryLock());
     Q_ASSERT(d()->api == nullptr); // never queue twice
     d()->api = api;
     d()->selfExecuteWrapper.wrap(setExecutor(&d()->selfExecuteWrapper));
     CollectionExecuteWrapper *wrapper = new CollectionExecuteWrapper();
     wrapper->setCollection(this);
     wrapper->wrap(setExecutor(wrapper));
     Job::aboutToBeQueued_locked(api);
 }
 
 void Collection::aboutToBeDequeued_locked(QueueAPI *api)
 {
     Q_ASSERT(!mutex()->tryLock());
     Q_ASSERT(api && d()->api == api);
     d()->dequeueElements(this, true);
     d()->api = nullptr;
 
     Q_ASSERT(dynamic_cast<CollectionExecuteWrapper *>(executor()));
     auto wrapper = static_cast<CollectionExecuteWrapper *>(executor());
     wrapper->unwrap(this);
     delete wrapper;
 
     Q_ASSERT(executor() == &d()->selfExecuteWrapper);
     d()->selfExecuteWrapper.unwrap(this);
 
     Job::aboutToBeDequeued_locked(api);
 }
 
 void Collection::execute(const JobPointer &job, Thread *thread)
 {
     {
         QMutexLocker l(mutex());
         Q_UNUSED(l);
         Q_ASSERT(d()->self.isNull());
         Q_ASSERT(d()->api != nullptr);
         d()->self = job;
         d()->selfIsExecuting = true; // reset in elementFinished
     }
     Job::execute(job, thread);
 }
 
 void Collection::run(JobPointer, Thread *)
 {
     // empty
 }
 
 Private::Collection_Private *Collection::d()
 {
     return reinterpret_cast<Private::Collection_Private *>(Job::d());
 }
 
 const Private::Collection_Private *Collection::d() const
 {
     return reinterpret_cast<const Private::Collection_Private *>(Job::d());
 }
 
 JobPointer Collection::jobAt(int i)
 {
     Q_ASSERT(!mutex()->tryLock());
     Q_ASSERT(i >= 0 && i < d()->elements.size());
     return d()->elements.at(i);
 }
 
 int Collection::elementCount() const
 {
     QMutexLocker l(mutex());
     Q_UNUSED(l);
     return jobListLength_locked();
 }
 
 int Collection::jobListLength_locked() const
 {
     return d()->elements.size();
 }
 
 Collection &Collection::operator<<(JobInterface *job)
 {
     addJob(make_job(job));
     return *this;
 }
 
 Collection &Collection::operator<<(const JobPointer &job)
 {
     addJob(job);
     return *this;
 }
 
 Collection &Collection::operator<<(JobInterface &job)
 {
     addJob(make_job_raw(&job));
     return *this;
 }
 
 }