73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CC_HELPER_H__
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#define __CC_HELPER_H__
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#include <stdint.h>
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#include <common_time/ICommonClock.h>
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#include <utils/threads.h>
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namespace android {
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// CCHelper is a simple wrapper class to help with centralizing access to the
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// Common Clock service and implementing lifetime managment, as well as to
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// implement a simple policy of making a basic attempt to reconnect to the
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// common clock service when things go wrong.
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//
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// On platforms which run the native common_time service in auto-disable mode,
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// the service will go into networkless mode whenever it has no active clients.
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// It tracks active clients using registered CommonClockListeners (the callback
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// interface for onTimelineChanged) since this provides a convienent death
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// handler notification for when the service's clients die unexpectedly. This
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// means that users of the common time service should really always have a
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// CommonClockListener, unless they know that the time service is not running in
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// auto disabled mode, or that there is at least one other registered listener
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// active in the system. The CCHelper makes this a little easier by sharing a
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// ref counted ICommonClock interface across all clients and automatically
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// registering and unregistering a listener whenever there are CCHelper
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// instances active in the process.
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class CCHelper {
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public:
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CCHelper();
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~CCHelper();
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status_t isCommonTimeValid(bool* valid, uint32_t* timelineID);
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status_t commonTimeToLocalTime(int64_t commonTime, int64_t* localTime);
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status_t localTimeToCommonTime(int64_t localTime, int64_t* commonTime);
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status_t getCommonTime(int64_t* commonTime);
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status_t getCommonFreq(uint64_t* freq);
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status_t getLocalTime(int64_t* localTime);
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status_t getLocalFreq(uint64_t* freq);
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private:
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class CommonClockListener : public BnCommonClockListener {
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public:
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void onTimelineChanged(uint64_t timelineID);
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};
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static bool verifyClock_l();
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static Mutex lock_;
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static sp<ICommonClock> common_clock_;
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static sp<ICommonClockListener> common_clock_listener_;
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static uint32_t ref_count_;
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};
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} // namespace android
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#endif // __CC_HELPER_H__
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