1 files changed, 54 insertions, 0 deletions
diff --git a/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h b/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h
new file mode 100644
index 0000000000..c85d57c0ea
--- /dev/null
+++ b/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h
@@ -0,0 +1,54 @@
+/*
+ *
+ * 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>
+
+struct grpc_completion_queue;
+struct grpc_event;
+
+typedef void(^GRPCEventHandler)(struct grpc_event *event);
+
+// This class lets one more easily use grpc_completion_queue. To use it, pass
+// the value of the unmanagedQueue property of an instance of this class to
+// grpc_call_start_invoke. Then for every grpc_call_* method that accepts a tag,
+// you can pass a block of type GRPCEventHandler (remembering to cast it using
+// __bridge_retained). The block is guaranteed to eventually be called, by a
+// concurrent queue, and then released. Each such block is passed a pointer to
+// the grpc_event that carried it (in event->tag).
+// Release the GRPCCompletionQueue object only after you are not going to pass
+// any more blocks to the grpc_call that's using it.
+@interface GRPCCompletionQueue : NSObject
+@property(nonatomic, readonly) struct grpc_completion_queue *unmanagedQueue;
+
++ (instancetype)completionQueue;
+@end