[GitHub] nickva commented on a change in pull request #470: Scheduling Replicator

[gi...@git.apache.org]

nickva commented on a change in pull request #470: Scheduling Replicator
URL: https://github.com/apache/couchdb/pull/470#discussion_r110426780
 
 

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 File path: src/couch_replicator/src/couch_replicator_connection.erl
 ##########
 @@ -0,0 +1,211 @@
+% Licensed 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(couch_replicator_connection).
+
+-behavior(gen_server).
+-behavior(config_listener).
+
+-export([start_link/0]).
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2]).
+-export([code_change/3, terminate/2]).
+
+-export([acquire/1, relinquish/1]).
+
+-export([handle_config_change/5, handle_config_terminate/3]).
+
+-define(DEFAULT_CLOSE_INTERVAL, 90000).
+-define(RELISTEN_DELAY, 5000).
+
+-record(state, {
+    close_interval,
+    timer
+}).
+
+-record(connection, {
+    worker,
+    host,
+    port,
+    mref
+}).
+
+-include_lib("ibrowse/include/ibrowse.hrl").
+
+
+start_link() ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+
+
+init([]) ->
+    process_flag(trap_exit, true),
+    ?MODULE = ets:new(?MODULE, [named_table, public, {keypos, #connection.worker}]),
+    ok = config:listen_for_changes(?MODULE, nil),
+    Interval = config:get_integer("replicator", "connection_close_interval", ?DEFAULT_CLOSE_INTERVAL),
+    {ok, Timer} = timer:send_after(Interval, close_idle_connections),
+    ibrowse:add_config([{inactivity_timeout, Interval}]),
+    {ok, #state{close_interval=Interval, timer=Timer}}.
+
+
+acquire(URL) when is_binary(URL) ->
+    acquire(binary_to_list(URL));
+
+acquire(URL) ->
+    case gen_server:call(?MODULE, {acquire, URL}) of
+        {ok, Worker} ->
+            link(Worker),
+            {ok, Worker};
+        {error, all_allocated} ->
+            {ok, Pid} = ibrowse:spawn_link_worker_process(URL),
+            ok = gen_server:call(?MODULE, {create, URL, Pid}),
+            {ok, Pid};
+        {error, Reason} ->
+            {error, Reason}
+    end.
+
+
+relinquish(Worker) ->
+    unlink(Worker),
+    gen_server:cast(?MODULE, {relinquish, Worker}).
+
+
+handle_call({acquire, URL}, From, State) ->
+    {Pid, _Ref} = From,
+    case ibrowse_lib:parse_url(URL) of
+        #url{host=Host, port=Port} ->
 
 Review comment:
   @davisp Good point. I think parsing url outside the gen_server and calling acquire with host, port tuple might work?
   
   @sagelywizard Want to take a look at this one
 
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