| /* |
| * |
| * 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> |
| |
| @protocol GRXWriteable; |
| @protocol GRXWriter; |
| |
| // This is a thread-safe wrapper over a GRXWriteable instance. It lets one |
| // enqueue calls to a GRXWriteable instance for the main thread, guaranteeing |
| // that didFinishWithError: is the last message sent to it (no matter what |
| // messages are sent to the wrapper, in what order, nor from which thread). It |
| // also guarantees that, if cancelWithError: is called from the main thread |
| // (e.g. by the app cancelling the writes), no further messages are sent to the |
| // writeable except didFinishWithError:. |
| // |
| // TODO(jcanizales): Let the user specify another queue for the writeable |
| // callbacks. |
| // TODO(jcanizales): Rename to GRXWriteableWrapper and move to the Rx library. |
| @interface GRPCDelegateWrapper : NSObject |
| |
| // The GRXWriteable passed is the wrapped writeable. |
| // Both the GRXWriter instance and the GRXWriteable instance are retained until |
| // didFinishWithError: is sent to the writeable, and released after that. |
| // This is used to create a retain cycle that keeps both objects alive until the |
| // writing is explicitly finished. |
| - (instancetype)initWithWriteable:(id<GRXWriteable>)writeable writer:(id<GRXWriter>)writer |
| NS_DESIGNATED_INITIALIZER; |
| |
| // Enqueues didReceiveValue: to be sent to the writeable in the main thread. |
| // The passed handler is invoked from the main thread after didReceiveValue: |
| // returns. |
| - (void)enqueueMessage:(NSData *)message completionHandler:(void (^)())handler; |
| |
| // Enqueues didFinishWithError:nil to be sent to the writeable in the main |
| // thread. After that message is sent to the writeable, all other methods of |
| // this object are effectively noops. |
| - (void)enqueueSuccessfulCompletion; |
| |
| // If the writeable has not yet received a didFinishWithError: message, this |
| // will enqueue one to be sent to it in the main thread, and cancel all other |
| // pending messages to the writeable enqueued by this object (both past and |
| // future). |
| // The error argument cannot be nil. |
| - (void)cancelWithError:(NSError *)error; |
| |
| // Cancels all pending messages to the writeable enqueued by this object (both |
| // past and future). Because the writeable won't receive didFinishWithError:, |
| // this also releases the writeable and the writer. |
| - (void)cancelSilently; |
| @end |