63 lines
1.7 KiB
Markdown
63 lines
1.7 KiB
Markdown
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# Utility classes for VHAL implementation
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---
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This directory stores utility classes for VHAL implementation. Vendor
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implementation could use utility classes from `common` folder in their
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VHAL implementation.
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## common
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Defines common utility libraries.
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### ConcurrentQueue
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Provides a thread-safe concurrent queue object. Useful for adding object to
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a queue in one thread (usually binder thread) and handle the objects in a
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separate handler thread.
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### ParcelableUtils
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Provides functions to convert between a regular parcelable and a
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`LargeParcelabe`.
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A `LargeParcelable` is a parcelable that marshals the payload
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into a shared memory file if the payload is too large to pass across binder.
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It is used to pass large data across binder. Before sending the data, VHAL
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impl should convert a regular parcelabe to a `LargeParcelable`. After receving
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data, VHAL impl should convert a `LargeParcelable` back to regular parcelabe.
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### PendingRequestPool
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Defines A class for managing pending requests and automatically call timeout
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callback if the request timed-out.
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### PropertyUtils
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Defines some useful constants.
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### RecurrentTimer
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Defines a thread-safe recurrent timer that can call a function periodically.
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### VehicleHalTypes
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Provides a header file that includes many commonly used header files. Useful
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when you are using multiple types defined in VHAL interface.
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### VehicleObjectPool
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Defines a reusable in-memory pool for `VehiclePropValue`.
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### VehiclePropertyStore
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Defines an in-memory map for storing vehicle properties. Allows easier insert,
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delete and lookup.
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### VehicleUtils
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Defines many useful utility functions.
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## test
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Defines utility libraries for test only.
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