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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HRTFDatabaseLoader_h
#define HRTFDatabaseLoader_h
#include "HRTFDatabase.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
// HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new thread.
class HRTFDatabaseLoader : public RefCounted<HRTFDatabaseLoader> {
public:
// Lazily creates the singleton HRTFDatabaseLoader (if not already created) and starts loading asynchronously (when created the first time).
// Returns the singleton HRTFDatabaseLoader.
// Must be called from the main thread.
static PassRefPtr<HRTFDatabaseLoader> createAndLoadAsynchronouslyIfNecessary(double sampleRate);
// Returns the singleton HRTFDatabaseLoader.
static HRTFDatabaseLoader* loader() { return s_loader; }
// Both constructor and destructor must be called from the main thread.
~HRTFDatabaseLoader();
// Returns true once the default database has been completely loaded.
bool isLoaded() const;
// May not be called on the main thread.
// This is so a different background thread may synchronize with the loader thread.
void waitForLoaderThreadCompletion();
HRTFDatabase* database() { return m_hrtfDatabase.get(); }
// Called in asynchronous loading thread.
void load();
// defaultHRTFDatabase() gives access to the loaded database.
// This can be called from any thread, but it is the callers responsibilty to call this while the context (and thus HRTFDatabaseLoader)
// is still alive. Otherwise this will return 0.
static HRTFDatabase* defaultHRTFDatabase();
private:
// Both constructor and destructor must be called from the main thread.
explicit HRTFDatabaseLoader(double sampleRate);
// If it hasn't already been loaded, creates a new thread and initiates asynchronous loading of the default database.
// This must be called from the main thread.
void loadAsynchronously();
double databaseSampleRate() const { return m_databaseSampleRate; }
static HRTFDatabaseLoader* s_loader; // singleton
OwnPtr<HRTFDatabase> m_hrtfDatabase;
ThreadIdentifier m_databaseLoaderThread;
bool m_startedLoadingDatabase;
double m_databaseSampleRate;
};
} // namespace WebCore
#endif // HRTFDatabaseLoader_h
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