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#include "MCOperationQueue.h"
#include "MCOperation.h"
#include "MCOperationCallback.h"
#include "MCMainThread.h"
#include "MCUtils.h"
#include "MCArray.h"
#include "MCLog.h"
#include "MCAutoreleasePool.h"
#include <libetpan/libetpan.h>
#include <thread>
using namespace mailcore;
OperationQueue::OperationQueue()
{
mOperations = new Array();
mStarted = false;
mWaiting = false;
mOperationSem = mailsem_new();
mStartSem = mailsem_new();
mStopSem = mailsem_new();
mWaitingFinishedSem = mailsem_new();
}
OperationQueue::~OperationQueue()
{
MC_SAFE_RELEASE(mOperations);
mailsem_free(mOperationSem);
mailsem_free(mStartSem);
mailsem_free(mStopSem);
mailsem_free(mWaitingFinishedSem);
}
void OperationQueue::addOperation(Operation * op)
{
mLock.lock();
mOperations->addObject(op);
mLock.unlock();
mailsem_up(mOperationSem);
startThread();
}
void OperationQueue::runOperations()
{
MCLog("start thread");
mailsem_up(mStartSem);
while (true) {
Operation * op = NULL;
bool needsCheckRunning = false;
bool quitting;
AutoreleasePool * pool = new AutoreleasePool();
mailsem_down(mOperationSem);
mLock.lock();
if (mOperations->count() > 0) {
op = (Operation *) mOperations->objectAtIndex(0);
}
quitting = mQuitting;
mLock.unlock();
MCLog("quitting %i %p", mQuitting, op);
if ((op == NULL) && quitting) {
MCLog("stopping %p", this);
mailsem_up(mStopSem);
pool->release();
break;
}
op->main();
op->retain()->autorelease();
mLock.lock();
mOperations->removeObjectAtIndex(0);
if (mOperations->count() == 0) {
if (mWaiting) {
mailsem_up(mWaitingFinishedSem);
}
needsCheckRunning = true;
}
mLock.unlock();
if (!op->isCancelled()) {
if (op->callback() != NULL) {
performMethodOnMainThread((Object::Method) &OperationQueue::callbackOnMainThread, op, true);
}
}
if (needsCheckRunning) {
retain(); // (1)
MCLog("check running %p", this);
performMethodOnMainThread((Object::Method) &OperationQueue::checkRunningOnMainThread, this);
}
pool->release();
}
MCLog("cleanup thread %p", this);
}
void OperationQueue::callbackOnMainThread(Operation * op)
{
if (op->callback() != NULL) {
op->callback()->operationFinished(op);
}
}
void OperationQueue::checkRunningOnMainThread(void * context)
{
performMethodAfterDelay((Object::Method) &OperationQueue::checkRunningAfterDelay, NULL, 1);
}
void OperationQueue::checkRunningAfterDelay(void * context)
{
bool quitting = false;
mLock.lock();
if (!mQuitting) {
if (mOperations->count() == 0) {
MCLog("trying to quit %p", this);
mailsem_up(mOperationSem);
mQuitting = true;
quitting = true;
}
}
mLock.unlock();
// Number of operations can't be changed because it runs on main thread.
// And addOperation() should also be called from main thread.
if (quitting) {
mailsem_down(mStopSem);
mStarted = false;
}
release(); // (1)
}
void OperationQueue::startThread()
{
if (mStarted)
return;
mQuitting = false;
mStarted = true;
std::thread t([=]()
{
runOperations();
});
t.detach();
mailsem_down(mStartSem);
}
unsigned int OperationQueue::count()
{
unsigned int count;
mLock.lock();
count = mOperations->count();
mLock.unlock();
return count;
}
#if 0
void OperationQueue::waitUntilAllOperationsAreFinished()
{
bool waiting = false;
mLock.lock();
if (mOperations->count() > 0) {
mWaiting = true;
waiting = true;
}
mLock.unlock();
if (waiting) {
sem_wait(&mWaitingFinishedSem);
}
mWaiting = false;
}
#endif
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