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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 "nsHashKeys.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Mutex.h"
+#include "HRTFDatabase.h"
+
+template <class EntryType>
+class nsTHashtable;
+template <class T>
+class nsAutoRef;
+
+namespace WebCore {
+
+// HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new
+// thread.
+
+class HRTFDatabaseLoader {
+ public:
+ // Lazily creates a HRTFDatabaseLoader (if not already created) for the given
+ // sample-rate and starts loading asynchronously (when created the first
+ // time). Returns the HRTFDatabaseLoader. Must be called from the main thread.
+ static already_AddRefed<HRTFDatabaseLoader>
+ createAndLoadAsynchronouslyIfNecessary(float sampleRate);
+
+ // AddRef and Release may be called from any thread.
+ void AddRef() {
+#if defined(DEBUG) || defined(NS_BUILD_REFCNT_LOGGING)
+ int count =
+#endif
+ ++m_refCnt;
+ MOZ_ASSERT(count > 0, "invalid ref count");
+ NS_LOG_ADDREF(this, count, "HRTFDatabaseLoader", sizeof(*this));
+ }
+
+ void Release() {
+ // The last reference can't be removed on a non-main thread because
+ // the object can be accessed on the main thread from the hash
+ // table via createAndLoadAsynchronouslyIfNecessary().
+ int count = m_refCnt;
+ MOZ_ASSERT(count > 0, "extra release");
+ // Optimization attempt to possibly skip proxying the release to the
+ // main thread.
+ if (count != 1 && m_refCnt.compareExchange(count, count - 1)) {
+ NS_LOG_RELEASE(this, count - 1, "HRTFDatabaseLoader");
+ return;
+ }
+
+ ProxyRelease();
+ }
+
+ // Returns true once the default database has been completely loaded.
+ bool isLoaded() const;
+
+ // waitForLoaderThreadCompletion() may be called more than once,
+ // on any thread except m_databaseLoaderThread.
+ void waitForLoaderThreadCompletion();
+
+ HRTFDatabase* database() {
+ if (!m_databaseLoaded) {
+ return nullptr;
+ }
+ return m_hrtfDatabase.get();
+ }
+
+ float databaseSampleRate() const { return m_databaseSampleRate; }
+
+ static void shutdown();
+
+ // Called in asynchronous loading thread.
+ void load();
+
+ // Sums the size of all cached database loaders.
+ static size_t sizeOfLoaders(mozilla::MallocSizeOf aMallocSizeOf);
+
+ private:
+ // Both constructor and destructor must be called from the main thread.
+ explicit HRTFDatabaseLoader(float sampleRate);
+ ~HRTFDatabaseLoader();
+
+ size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ void ProxyRelease(); // any thread
+ void MainThreadRelease(); // main thread only
+ class ProxyReleaseEvent;
+
+ // 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();
+
+ // Map from sample-rate to loader.
+ class LoaderByRateEntry : public nsFloatHashKey {
+ public:
+ explicit LoaderByRateEntry(KeyTypePointer aKey)
+ : nsFloatHashKey(aKey),
+ mLoader() // so PutEntry() will zero-initialize
+ {}
+
+ size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
+ return mLoader ? mLoader->sizeOfIncludingThis(aMallocSizeOf) : 0;
+ }
+
+ // The HRTFDatabaseLoader removes itself from s_loaderMap on destruction.
+ HRTFDatabaseLoader* MOZ_NON_OWNING_REF mLoader;
+ };
+
+ // Keeps track of loaders on a per-sample-rate basis.
+ static nsTHashtable<LoaderByRateEntry>* s_loaderMap; // singleton
+
+ mozilla::Atomic<int> m_refCnt;
+
+ nsAutoRef<HRTFDatabase> m_hrtfDatabase;
+
+ // Holding a m_threadLock is required when accessing m_databaseLoaderThread.
+ mozilla::Mutex m_threadLock;
+ PRThread* m_databaseLoaderThread MOZ_GUARDED_BY(m_threadLock);
+
+ float m_databaseSampleRate;
+ mozilla::Atomic<bool> m_databaseLoaded;
+};
+
+} // namespace WebCore
+
+#endif // HRTFDatabaseLoader_h