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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#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.
// TODO(jcanizales): Name it enumerator:(id<GRXEnumerator>) didProduceValue:(id)?
- (void)didReceiveValue:(id)value;
// Signal that the sequence is completed, or that an error ocurred. After this
// message is sent to the instance, neither it nor didReceiveValue: may be
// called again.
// TODO(jcanizales): enumerator:(id<GRXEnumerator>) didFinishWithError:(NSError*)?
- (void)didFinishWithError:(NSError *)errorOrNil;
@end
typedef void (^GRXValueHandler)(id value);
typedef void (^GRXCompletionHandler)(NSError *errorOrNil);
// 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)initWithValueHandler:(GRXValueHandler)valueHandler
completionHandler:(GRXCompletionHandler)completionHandler
NS_DESIGNATED_INITIALIZER;
@end
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