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134 lines
3.8 KiB
134 lines
3.8 KiB
/*
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* Copyright (C) 2013 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 ANDROID_SERVERS_CAMERA3_STATUSTRACKER_H
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#define ANDROID_SERVERS_CAMERA3_STATUSTRACKER_H
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#include <string>
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#include <utils/Condition.h>
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#include <utils/Errors.h>
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#include <utils/List.h>
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#include <utils/Mutex.h>
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#include <utils/Thread.h>
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#include <utils/KeyedVector.h>
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#include "common/CameraDeviceBase.h"
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namespace android {
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class Camera3Device;
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class Fence;
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namespace camera3 {
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/**
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* State tracking for idle and other collective state transitions.
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* Collects idle notifications from different sources and calls the
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* parent when all of them become idle.
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*
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* The parent is responsible for synchronizing the status updates with its
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* internal state correctly, which means the notifyStatus call to the parent may
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* block for a while.
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*/
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class StatusTracker: public Thread {
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public:
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explicit StatusTracker(wp<Camera3Device> parent);
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~StatusTracker();
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// An always-invalid component ID
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static const int NO_STATUS_ID = -1;
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// Add a component to track; returns non-negative unique ID for the new
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// component on success, negative error code on failure.
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// New components start in the idle state.
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int addComponent(std::string componentName);
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// Remove existing component from idle tracking. Ignores unknown IDs
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void removeComponent(int id);
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// Set the state of a tracked component to be idle. Ignores unknown IDs; can
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// accept a fence to wait on to complete idle. The fence is merged with any
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// previous fences given, which means they all must signal before the
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// component is considered idle.
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void markComponentIdle(int id, const sp<Fence>& componentFence);
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// Set the state of a tracked component to be active. Ignores unknown IDs.
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void markComponentActive(int id);
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void dumpActiveComponents();
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virtual void requestExit();
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protected:
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virtual bool threadLoop();
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private:
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enum ComponentState {
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IDLE,
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ACTIVE
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};
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void markComponent(int id, ComponentState state,
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const sp<Fence>& componentFence);
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// Guards mPendingChange, mPendingStates, mComponentsChanged
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Mutex mPendingLock;
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Condition mPendingChangeSignal;
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struct StateChange {
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int id;
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ComponentState state;
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sp<Fence> fence;
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};
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// A queue of yet-to-be-processed state changes to components
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Vector<StateChange> mPendingChangeQueue;
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bool mComponentsChanged;
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wp<Camera3Device> mParent;
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// Guards rest of internals. Must be locked after mPendingLock if both used.
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Mutex mLock;
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int mNextComponentId;
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// Current component states
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KeyedVector<int, ComponentState> mStates;
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KeyedVector<int, std::string> mComponentNames;
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// Merged fence for all processed state changes
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sp<Fence> mIdleFence;
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// Current overall device state
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ComponentState mDeviceState;
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// Private to threadLoop
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// Determine current overall device state
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// We're IDLE iff
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// - All components are currently IDLE
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// - The merged fence for all component updates has signalled
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ComponentState getDeviceStateLocked();
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Vector<ComponentState> mStateTransitions;
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static const nsecs_t kWaitDuration = 250000000LL; // 250 ms
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};
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} // namespace camera3
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} // namespace android
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#endif
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