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Diffstat (limited to 'drm/libdrmframework/plugins/common/util/include/SessionMap.h')
-rw-r--r-- | drm/libdrmframework/plugins/common/util/include/SessionMap.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/drm/libdrmframework/plugins/common/util/include/SessionMap.h b/drm/libdrmframework/plugins/common/util/include/SessionMap.h new file mode 100644 index 0000000..e563894 --- /dev/null +++ b/drm/libdrmframework/plugins/common/util/include/SessionMap.h @@ -0,0 +1,189 @@ +/* + * Copyright (C) 2010 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef __SESSIONMAP_H__ +#define __SESSIONMAP_H__ + +#include <utils/KeyedVector.h> +#include <utils/threads.h> + +namespace android { + +/** + * A thread safe wrapper template class for session handlings for Drm Engines. It wraps a + * pointer type over KeyedVector. It keeps pointer as data in the vector and free up memory + * allocated pointer can be of any type of structure/class meant for keeping session data. + * so session object here means pointer to the session data. + */ +template <typename TValue> +class SessionMap { + +public: + SessionMap() {} + + virtual ~SessionMap() { + Mutex::Autolock lock(mLock); + destroyMap(); + } + + /** + * Adds a new value in the session map table. It expects memory to be allocated already + * for the session object + * + * @param key - key or Session ID + * @param value - session object to add + * + * @return boolean result of adding value. returns false if key is already exist. + */ + bool addValue(int key, TValue value) { + Mutex::Autolock lock(mLock); + if (!isCreatedInternal(key)) { + map.add(key, value); + return true; + } + return false; + } + + /** + * returns the session object by the key + * + * @param key - key or Session ID + * + * @return session object as per the key + */ + TValue getValue(int key) { + Mutex::Autolock lock(mLock); + return getValueInternal(key); + } + + /** + * returns the number of objects in the session map table + * + * @return count of number of session objects. + */ + int getSize() { + Mutex::Autolock lock(mLock); + return map.size(); + } + + /** + * returns the session object by the index in the session map table + * + * @param index - index of the value required + * + * @return session object as per the index + */ + TValue getValueAt(unsigned int index) { + TValue value = NULL; + Mutex::Autolock lock(mLock); + + if (map.size() > index) { + value = map.valueAt(index); + } + return value; + } + + /** + * deletes the object from session map. It also frees up memory for the session object. + * + * @param key - key of the value to be deleted + * + */ + void removeValue(int key) { + Mutex::Autolock lock(mLock); + deleteValue(getValueInternal(key)); + map.removeItem(key); + } + + /** + * decides if session is already created. + * + * @param key - key of the value for the session + * + * @return boolean result of whether session is created + */ + bool isCreated(int key) { + Mutex::Autolock lock(mLock); + return isCreatedInternal(key); + } + + SessionMap<TValue> & operator=(const SessionMap<TValue> & objectCopy) { + Mutex::Autolock lock(mLock); + + destroyMap(); + map = objectCopy.map; + return *this; + } + +private: + KeyedVector<int, TValue> map; + Mutex mLock; + + /** + * free up the memory for the session object. + * Make sure if any reference to the session object anywhere, otherwise it will be a + * dangle pointer after this call. + * + * @param value - session object to free + * + */ + void deleteValue(TValue value) { + delete value; + } + + /** + * free up the memory for the entire map. + * free up any resources in the sessions before calling this funtion. + * + */ + void destroyMap() { + int size = map.size(); + + for (int i = 0; i < size; i++) { + deleteValue(map.valueAt(i)); + } + map.clear(); + } + + /** + * decides if session is already created. + * + * @param key - key of the value for the session + * + * @return boolean result of whether session is created + */ + bool isCreatedInternal(int key) { + return(0 <= map.indexOfKey(key)); + } + + /** + * returns the session object by the key + * + * @param key - key or Session ID + * + * @return session object as per the key + */ + TValue getValueInternal(int key) { + TValue value = NULL; + if (isCreatedInternal(key)) { + value = (TValue) map.valueFor(key); + } + return value; + } +}; + +}; + +#endif /* __SESSIONMAP_H__ */ |