diff --git a/lib/cocoa/src/TBaseClient.h b/lib/cocoa/src/TBaseClient.h
new file mode 100644
index 0000000..12944b1
--- /dev/null
+++ b/lib/cocoa/src/TBaseClient.h
@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 "TProtocol.h"
+#import "TApplicationException.h"
+
+@interface TBaseClient : NSObject {
+    id <TProtocol> inProtocol;
+    id <TProtocol> outProtocol;
+}
+
+- (TApplicationException *)checkIncomingMessageException;
+
+@end
diff --git a/lib/cocoa/src/TBaseClient.m b/lib/cocoa/src/TBaseClient.m
new file mode 100644
index 0000000..d15f9d3
--- /dev/null
+++ b/lib/cocoa/src/TBaseClient.m
@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 "TBaseClient.h"
+#import "TApplicationException.h"
+#import "TObjective-C.h"
+
+@implementation TBaseClient
+
+- (void) dealloc
+{
+    [inProtocol release_stub];
+    [outProtocol release_stub];
+    [super dealloc_stub];
+}
+
+- (TApplicationException *)checkIncomingMessageException
+{
+    int msgType = 0;
+    [inProtocol readMessageBeginReturningName: nil type: &msgType sequenceID: NULL];
+    if (msgType == TMessageType_EXCEPTION) {
+        TApplicationException * x = [TApplicationException read: inProtocol];
+        [inProtocol readMessageEnd];
+        return x;
+    }
+    
+    return nil;
+}
+
+@end
diff --git a/lib/cocoa/src/transport/TAsyncTransport.h b/lib/cocoa/src/transport/TAsyncTransport.h
new file mode 100644
index 0000000..f75b701
--- /dev/null
+++ b/lib/cocoa/src/transport/TAsyncTransport.h
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 "TTransport.h"
+#import "TException.h"
+
+typedef void(^TAsyncFailureBlock)(TException *);
+
+@protocol TAsyncTransport <TTransport>
+
+- (void) flush:(dispatch_block_t)flushed failure:(TAsyncFailureBlock)failure;
+
+@end