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/*
*
* Copyright 2015 gRPC 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.
*
*/
#import <Foundation/Foundation.h>
/**
* A GRXWriteable is an object to which a sequence of values can be sent. The
* sequence finishes with an optional error.
*/
@protocol GRXWriteable <NSObject>
/** Push the next value of the sequence to the receiving object. */
- (void)writeValue:(id)value;
/**
* Signal that the sequence is completed, or that an error ocurred. After this
* message is sent to the instance, neither it nor writeValue: may be
* called again.
*/
- (void)writesFinishedWithError:(NSError *)errorOrNil;
@end
typedef void (^GRXValueHandler)(id value);
typedef void (^GRXCompletionHandler)(NSError *errorOrNil);
typedef void (^GRXSingleHandler)(id value, NSError *errorOrNil);
typedef void (^GRXEventHandler)(BOOL done, id value, NSError *error);
/**
* Utility to create objects that conform to the GRXWriteable protocol, from
* blocks that handle each of the two methods of the protocol.
*/
@interface GRXWriteable : NSObject<GRXWriteable>
+ (instancetype)writeableWithSingleHandler:(GRXSingleHandler)handler;
+ (instancetype)writeableWithEventHandler:(GRXEventHandler)handler;
- (instancetype)initWithValueHandler:(GRXValueHandler)valueHandler
completionHandler:(GRXCompletionHandler)completionHandler
NS_DESIGNATED_INITIALIZER;
@end
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