| /* |
| * |
| * 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> |
| |
| #import "GRXWriter.h" |
| |
| /** |
| * Utility to construct GRXWriter instances from values that are immediately available when |
| * required. |
| * |
| * Thread-safety: |
| * |
| * An object of this class shouldn't be messaged concurrently by more than one thread. It will start |
| * messaging the writeable before |startWithWriteable:| returns, in the same thread. That is the |
| * only place where the writer can be paused or stopped prematurely. |
| * |
| * If a paused writer of this class is resumed, it will start messaging the writeable, in the same |
| * thread, before |setState:| returns. Because the object can't be legally accessed concurrently, |
| * that's the only place where it can be paused again (or stopped). |
| */ |
| @interface GRXImmediateWriter : GRXWriter |
| |
| /** |
| * Returns a writer that pulls values from the passed NSEnumerator instance and pushes them to |
| * its writeable. The NSEnumerator is released when it finishes. |
| */ |
| + (GRXWriter *)writerWithEnumerator:(NSEnumerator *)enumerator; |
| |
| /** |
| * Returns a writer that pushes to its writeable the successive values returned by the passed |
| * block. When the block first returns nil, it is released. |
| */ |
| + (GRXWriter *)writerWithValueSupplier:(id (^)(void))block; |
| |
| /** |
| * Returns a writer that iterates over the values of the passed container and pushes them to |
| * its writeable. The container is released when the iteration is over. |
| * |
| * Note that the usual speed gain of NSFastEnumeration over NSEnumerator results from not having to |
| * call one method per element. Because GRXWriteable instances accept values one by one, that speed |
| * gain doesn't happen here. |
| */ |
| + (GRXWriter *)writerWithContainer:(id<NSFastEnumeration>)container; |
| |
| /** |
| * Returns a writer that sends the passed value to its writeable and then finishes (releasing the |
| * value). |
| */ |
| + (GRXWriter *)writerWithValue:(id)value; |
| |
| /** |
| * Returns a writer that, as part of its start method, sends the passed error to the writeable |
| * (then releasing the error). |
| */ |
| + (GRXWriter *)writerWithError:(NSError *)error; |
| |
| /** |
| * Returns a writer that, as part of its start method, finishes immediately without sending any |
| * values to its writeable. |
| */ |
| + (GRXWriter *)emptyWriter; |
| |
| @end |