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Add Darwin methods to use attribute cache (#15877)
* Define new object CHIPAttributeCacheContainer to represent cache per node * Add new method to Darwin cluster library template to read attribute from cache object * Add a method in the cache object to read attribute with generic path * Add XPC protocol to support new method * Fix CHIPDevice subscription handling errors and automatic resubscription by replacing callback bridge with implementation which can handle errors and by retaining attribute path object. * Implement deregistering CHIPDevice subscriptions in order to support testing with clean states.
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| /** | ||
| * | ||
| * Copyright (c) 2022 Project CHIP Authors | ||
| * | ||
| * 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. | ||
| */ | ||
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| #import <Foundation/Foundation.h> | ||
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| #import <CHIP/CHIPDeviceController.h> | ||
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| NS_ASSUME_NONNULL_BEGIN | ||
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| @interface CHIPAttributeCacheContainer : NSObject | ||
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| /** | ||
| * Subscribes to all attributes to update attribute cache. | ||
| * | ||
| * @param deviceController device controller to retrieve connected device from | ||
| * @param deviceId device identifier of the device to cache attributes of | ||
| * @param clientQueue client queue to dispatch the completion handler through | ||
| * @param completion completion handler | ||
| */ | ||
| - (void)subscribeWithDeviceController:(CHIPDeviceController *)deviceController | ||
| deviceId:(uint64_t)deviceId | ||
| clientQueue:(dispatch_queue_t)clientQueue | ||
| completion:(void (^)(NSError * _Nullable error))completion; | ||
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| /** | ||
| * Reads an attribute with specific attribute path | ||
| * | ||
| * @param endpointId endpoint ID of the attribute | ||
| * @param clusterId cluster ID of the attribute | ||
| * @param attributeId attribute ID of the attribute | ||
| * @param clientQueue client queue to dispatch the completion handler through | ||
| * @param completion block to receive the result. | ||
| * "values" received by the block will have the same format of object as the one received by completion block | ||
| * of CHIPDevice readAttributeWithEndpointId:clusterId:attributeId:clientQueue:completion method. | ||
| */ | ||
| - (void)readAttributeWithEndpointId:(NSUInteger)endpointId | ||
| clusterId:(NSUInteger)clusterId | ||
| attributeId:(NSUInteger)attributeId | ||
| clientQueue:(dispatch_queue_t)clientQueue | ||
| completion:(void (^)(NSArray<NSDictionary<NSString *, id> *> * _Nullable values, | ||
| NSError * _Nullable error))completion; | ||
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| @end | ||
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| NS_ASSUME_NONNULL_END |
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