mirror of https://github.com/grpc/grpc.git
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#import "GRXWriter.h" |
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// A "proxy" class that simply forwards values, completion, and errors from its
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// input writer to its writeable.
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// It is useful as a superclass for pipes that act as a transformation of their
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// input writer, and for classes that represent objects with input and
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// output sequences of values, like an RPC.
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@interface GRXForwardingWriter : GRXWriter |
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- (instancetype)initWithWriter:(id<GRXWriter>)writer NS_DESIGNATED_INITIALIZER; |
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@end |
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/* |
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#import "GRXForwardingWriter.h" |
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@interface GRXForwardingWriter () <GRXWriteable> |
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@end |
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@implementation GRXForwardingWriter { |
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id<GRXWriter> _writer; |
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id<GRXWriteable> _writeable; |
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} |
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- (instancetype)init { |
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return [self initWithWriter:nil]; |
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} |
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// Designated initializer |
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- (instancetype)initWithWriter:(id<GRXWriter>)writer { |
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if (!writer) { |
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[NSException raise:NSInvalidArgumentException format:@"writer can't be nil."]; |
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} |
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if ((self = [super init])) { |
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_writer = writer; |
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} |
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return self; |
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} |
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// This is used to send a completion or an error to the writeable. It nillifies |
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// our reference to it in order to guarantee no more messages are sent to it, |
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// and to release it. |
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- (void)finishOutputWithError:(NSError *)errorOrNil { |
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id<GRXWriteable> writeable = _writeable; |
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_writeable = nil; |
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[writeable writesFinishedWithError:errorOrNil]; |
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} |
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// This is used to stop the input writer. It nillifies our reference to it |
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// to release it. |
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- (void)finishInput { |
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id<GRXWriter> writer = _writer; |
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_writer = nil; |
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writer.state = GRXWriterStateFinished; |
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} |
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#pragma mark GRXWriteable implementation |
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- (void)writeValue:(id)value { |
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[_writeable writeValue:value]; |
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} |
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- (void)writesFinishedWithError:(NSError *)errorOrNil { |
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_writer = nil; |
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[self finishOutputWithError:errorOrNil]; |
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} |
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#pragma mark GRXWriter implementation |
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- (GRXWriterState)state { |
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return _writer ? _writer.state : GRXWriterStateFinished; |
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} |
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- (void)setState:(GRXWriterState)state { |
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if (state == GRXWriterStateFinished) { |
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_writeable = nil; |
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[self finishInput]; |
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} else { |
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_writer.state = state; |
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} |
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} |
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- (void)startWithWriteable:(id<GRXWriteable>)writeable { |
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_writeable = writeable; |
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[_writer startWithWriteable:self]; |
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} |
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- (void)finishWithError:(NSError *)errorOrNil { |
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[self finishOutputWithError:errorOrNil]; |
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[self finishInput]; |
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} |
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@end |
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