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/*
Copyright (C) 2014 Intel Corporation
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <glib.h>
#include <abstractpropertytype.h>
#include "listplusplus.h"
#include <mutex>
#include <condition_variable>
#include <unordered_set>
#include <vector>
namespace amb
{
template <typename T, class Pred = std::equal_to<T> >
class Queue
{
public:
Queue(bool unique = false, bool blocking = false)
:mUnique(unique), mBlocking(blocking)
{
}
virtual ~Queue()
{
}
int count()
{
std::lock_guard<std::mutex> lock(mutex);
return mQueue.size();
}
T pop()
{
std::unique_lock<std::mutex> lock(mutex);
if(mBlocking)
{
if(!mQueue.size())
{
cond.wait(lock);
}
}
if(!mQueue.size())
{
throw std::runtime_error("nothing in queue");
}
auto itr = mQueue.begin();
T item = *itr;
mQueue.erase(itr);
return item;
}
virtual void append(T item)
{
{
std::lock_guard<std::mutex> lock(mutex);
if(contains(mQueue, item))
{
mQueue.erase(std::find(mQueue.begin(), mQueue.end(), item));
}
mQueue.push_back(item);
}
if(mBlocking)
{
cond.notify_all();
}
}
void remove(T item)
{
std::lock_guard<std::mutex> lock(mutex);
removeOne(&mQueue, item);
}
private:
bool mBlocking;
bool mUnique;
std::mutex mutex;
std::condition_variable cond;
std::vector<T> mQueue;
};
template <typename T, class Pred = std::equal_to<T> >
struct AsyncQueueSource{
GSource source;
Queue<T, Pred>* queue;
int minQueueSize;
};
template <typename T, class Pred = std::equal_to<T> >
class AsyncQueueWatcher
{
public:
typedef function<void (Queue<T, Pred> *)> AsyncQueueWatcherCallback;
AsyncQueueWatcher(Queue<T, Pred> * queue, AsyncQueueWatcherCallback cb, int queueSize = 0, AbstractPropertyType::Priority priority = AbstractPropertyType::Normal)
: callback(cb), mMaxQueueSize(queueSize)
{
static GSourceFuncs funcs = {prepare, check, dispatch, finalize};
GSource* source = (GSource *) g_source_new(&funcs, sizeof(AsyncQueueSource<T, Pred>));
AsyncQueueSource<T, Pred>* watch = (AsyncQueueSource<T, Pred>*)source;
watch->queue = queue;
watch->minQueueSize = queueSize;
gint p = G_PRIORITY_DEFAULT;
if(priority == AbstractPropertyType::Normal)
p = G_PRIORITY_DEFAULT;
else if(priority == AbstractPropertyType::High)
p = G_PRIORITY_HIGH;
else if(priority == AbstractPropertyType::Low)
p = G_PRIORITY_LOW;
g_source_set_priority(source, p);
g_source_set_callback(source, nullptr, this, nullptr);
g_source_attach(source, nullptr);
g_source_unref(source);
}
AsyncQueueWatcherCallback callback;
protected:
AsyncQueueWatcher(){}
int mMaxQueueSize;
private:
static gboolean prepare(GSource *source, gint *timeout)
{
AsyncQueueSource<T, Pred>* s = (AsyncQueueSource<T, Pred>*)source;
*timeout = -1;
if (!s)
return false;
return s->queue->count() > s->minQueueSize;
}
static gboolean check(GSource *source)
{
AsyncQueueSource<T, Pred>* s = (AsyncQueueSource<T, Pred>*)source;
if (!s)
return false;
return s->queue->count() > s->minQueueSize;
}
static gboolean dispatch(GSource *source, GSourceFunc callback, gpointer userData)
{
AsyncQueueSource<T, Pred>* s = (AsyncQueueSource<T, Pred>*)source;
if (!s)
return false;
AsyncQueueWatcher<T, Pred>* watcher = static_cast<AsyncQueueWatcher<T, Pred>*>(userData);
watcher->callback(s->queue);
return true;
}
static void finalize(GSource* source)
{
}
};
} // namespace amb
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