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44 lines
1.6 KiB
Objective-C
44 lines
1.6 KiB
Objective-C
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_
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#define BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_
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#import <Foundation/Foundation.h>
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typedef void (^ExecutionWithObserverBlock)(id);
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// Implements a container for observers that implement a specific Objective-C
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// protocol. The container forwards method invocations to its contained
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// observers, so that sending a message to all the observers is as simple as
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// sending the message to the container.
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// It is safe for an observer to remove itself or another observer while being
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// notified. It is also safe to add an other observer while being notified but
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// the newly added observer will not be notified as part of the current
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// notification dispatch.
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@interface CRBProtocolObservers : NSObject
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// The Objective-C protocol that the observers in this container conform to.
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@property(nonatomic, readonly) Protocol* protocol;
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// Returns a CRBProtocolObservers container for observers that conform to
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// |protocol|.
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+ (instancetype)observersWithProtocol:(Protocol*)protocol;
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// Adds |observer| to this container.
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- (void)addObserver:(id)observer;
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// Remove |observer| from this container.
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- (void)removeObserver:(id)observer;
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// Returns true if there are currently no observers.
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- (BOOL)empty;
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// Executes callback on every observer. |callback| cannot be nil.
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- (void)executeOnObservers:(ExecutionWithObserverBlock)callback;
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@end
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#endif // BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_
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