Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/RxLibrary/GRXWriter+Immediate.h

 /*
- * Copyright (C) 2009 Google Inc. All rights reserved.
+ *
+ * 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.
+ *
  */
 
-#ifndef SQLTransactionClient_h
-#define SQLTransactionClient_h
+#import "GRXWriter.h"
 
-#include "wtf/Allocator.h"
-#include "wtf/Noncopyable.h"
+@interface GRXWriter (Immediate)
 
-namespace blink {
+/**
+ * Returns a writer that pulls values from the passed NSEnumerator instance and pushes them to
+ * its writeable. The NSEnumerator is released when it finishes.
+ */
++ (instancetype)writerWithEnumerator:(NSEnumerator *)enumerator;
 
-class Database;
+/**
+ * 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.
+ */
++ (instancetype)writerWithValueSupplier:(id (^)())block;
 
-// A client to the SQLTransaction class. Allows SQLTransaction to notify interested
-// parties that certain things have happened in a transaction.
-class SQLTransactionClient {
-    WTF_MAKE_NONCOPYABLE(SQLTransactionClient); USING_FAST_MALLOC(SQLTransactionClient);
-public:
-    SQLTransactionClient() { }
-    void didCommitWriteTransaction(Database*);
-    bool didExceedQuota(Database*);
-};
+/**
+ * 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.
+ */
++ (instancetype)writerWithContainer:(id<NSFastEnumeration>)container;
 
-} // namespace blink
+/**
+ * Returns a writer that sends the passed value to its writeable and then finishes (releasing the
+ * value).
+ */
++ (instancetype)writerWithValue:(id)value;
 
-#endif // SQLTransactionClient_h
+/**
+ * Returns a writer that, as part of its start method, sends the passed error to the writeable
+ * (then releasing the error).
+ */
++ (instancetype)writerWithError:(NSError *)error;
+
+/**
+ * Returns a writer that, as part of its start method, finishes immediately without sending any
+ * values to its writeable.
+ */
++ (instancetype)emptyWriter;
+
+@end