1 files changed, 117 insertions, 0 deletions
diff --git a/src/jaegertracing/thrift/lib/erl/src/thrift_transport_state_test.erl b/src/jaegertracing/thrift/lib/erl/src/thrift_transport_state_test.erl
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index 000000000..e83a44d26
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+++ b/src/jaegertracing/thrift/lib/erl/src/thrift_transport_state_test.erl
@@ -0,0 +1,117 @@
+%%
+%% 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.
+%%
+
+-module(thrift_transport_state_test).
+
+-behaviour(gen_server).
+-behaviour(thrift_transport).
+
+%% API
+-export([new/1]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+         terminate/2, code_change/3]).
+
+%% thrift_transport callbacks
+-export([write/2, read/2, flush/1, close/1]).
+
+-record(trans, {wrapped, % #thrift_transport{}
+                version :: integer(),
+                counter :: pid()
+               }).
+-type state() :: #trans{}.
+-include("thrift_transport_behaviour.hrl").
+
+-record(state, {cversion :: integer()}).
+
+
+new(WrappedTransport) ->
+    case gen_server:start_link(?MODULE, [], []) of
+        {ok, Pid} ->
+            Trans = #trans{wrapped = WrappedTransport,
+                           version = 0,
+                           counter = Pid},
+            thrift_transport:new(?MODULE, Trans);
+        Else ->
+            Else
+    end.
+
+%%====================================================================
+%% thrift_transport callbacks
+%%====================================================================
+
+write(Transport0 = #trans{wrapped = Wrapped0}, Data) ->
+    Transport1 = check_version(Transport0),
+    {Wrapped1, Result} = thrift_transport:write(Wrapped0, Data),
+    Transport2 = Transport1#trans{wrapped = Wrapped1},
+    {Transport2, Result}.
+
+flush(Transport0 = #trans{wrapped = Wrapped0}) ->
+    Transport1 = check_version(Transport0),
+    {Wrapped1, Result} = thrift_transport:flush(Wrapped0),
+    Transport2 = Transport1#trans{wrapped = Wrapped1},
+    {Transport2, Result}.
+
+close(Transport0 = #trans{wrapped = Wrapped0}) ->
+    Transport1 = check_version(Transport0),
+    shutdown_counter(Transport1),
+    {Wrapped1, Result} = thrift_transport:close(Wrapped0),
+    Transport2 = Transport1#trans{wrapped = Wrapped1},
+    {Transport2, Result}.
+
+read(Transport0 = #trans{wrapped = Wrapped0}, Len) ->
+    Transport1 = check_version(Transport0),
+    {Wrapped1, Result} = thrift_transport:read(Wrapped0, Len),
+    Transport2 = Transport1#trans{wrapped = Wrapped1},
+    {Transport2, Result}.
+
+
+%%====================================================================
+%% gen_server callbacks
+%%====================================================================
+
+init([]) ->
+    {ok, #state{cversion = 0}}.
+
+handle_call(check_version, _From, State = #state{cversion = Version}) ->
+    {reply, Version, State#state{cversion = Version+1}}.
+
+handle_cast(shutdown, State) ->
+    {stop, normal, State}.
+
+handle_info(_Info, State) -> {noreply, State}.
+code_change(_OldVsn, State, _Extra) -> {ok, State}.
+terminate(_Reason, _State) -> ok.
+
+%%--------------------------------------------------------------------
+%% Internal functions
+%%--------------------------------------------------------------------
+
+check_version(Transport = #trans{version = Version, counter = Counter}) ->
+    case gen_server:call(Counter, check_version) of
+        Version ->
+            Transport#trans{version = Version+1};
+        _Else ->
+            % State wasn't propagated properly.  Die.
+            erlang:error(state_not_propagated)
+    end.
+
+shutdown_counter(#trans{counter = Counter}) ->
+    gen_server:cast(Counter, shutdown).