Remove retain of handler in callbacks and dispatch to dispatchQueue

1 files changed, 8 insertions, 3 deletions

diff --git a/src/objective-c/GRPCClient/GRPCCall.h b/src/objective-c/GRPCClient/GRPCCall.h
index 2f23b879f1..85d0a302d1 100644
--- a/src/objective-c/GRPCClient/GRPCCall.h
+++ b/src/objective-c/GRPCClient/GRPCCall.h
@@ -155,12 +155,16 @@ extern NSString *const kGRPCTrailersKey;
 
 @optional
 
-/** Issued when initial metadata is received from the server. */
+/**
+  * Issued when initial metadata is received from the server. The task must be scheduled onto the
+  * dispatch queue in property \a dispatchQueue.
+  */
 - (void)receivedInitialMetadata:(NSDictionary *_Nullable)initialMetadata;
 
 /**
  * Issued when a message is received from the server. The message is the raw data received from the
- * server, with decompression and without proto deserialization.
+ * server, with decompression and without proto deserialization. The task must be scheduled onto the
+ * dispatch queue in property \a dispatchQueue.
  */
 - (void)receivedRawMessage:(NSData *_Nullable)message;
 
@@ -168,7 +172,8 @@ extern NSString *const kGRPCTrailersKey;
  * Issued when a call finished. If the call finished successfully, \a error is nil and \a
  * trainingMetadata consists any trailing metadata received from the server. Otherwise, \a error
  * is non-nil and contains the corresponding error information, including gRPC error codes and
- * error descriptions.
+ * error descriptions. The task must be scheduled onto the dispatch queue in property
+ * \a dispatchQueue.
  */
 - (void)closedWithTrailingMetadata:(NSDictionary *_Nullable)trailingMetadata
                              error:(NSError *_Nullable)error;