From 4fc7bef5c4a44c971852f8c9251faef48779f4d1 Mon Sep 17 00:00:00 2001 From: "Damien F. Katz" Date: Mon, 22 Dec 2008 20:41:05 +0000 Subject: Checking in new erlang source file, used for tracking file stats. git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@728767 13f79535-47bb-0310-9956-ffa450edef68 --- src/couchdb/Makefile.am | 2 ++ src/couchdb/couch_file_stats.erl | 68 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 70 insertions(+) create mode 100644 src/couchdb/couch_file_stats.erl diff --git a/src/couchdb/Makefile.am b/src/couchdb/Makefile.am index aaa6c67c..ae7a06e1 100644 --- a/src/couchdb/Makefile.am +++ b/src/couchdb/Makefile.am @@ -51,6 +51,7 @@ source_files = \ couch_external_manager.erl \ couch_external_server.erl \ couch_file.erl \ + couch_file_stats.erl \ couch_httpd.erl \ couch_httpd_db.erl \ couch_httpd_external.erl \ @@ -85,6 +86,7 @@ compiled_files = \ couch_external_manager.beam \ couch_external_server.beam \ couch_file.beam \ + couch_file_stats.beam \ couch_httpd.beam \ couch_httpd_db.beam \ couch_httpd_external.beam \ diff --git a/src/couchdb/couch_file_stats.erl b/src/couchdb/couch_file_stats.erl new file mode 100644 index 00000000..90ed973e --- /dev/null +++ b/src/couchdb/couch_file_stats.erl @@ -0,0 +1,68 @@ +% 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_file_stats). +-behaviour(gen_server). + +-export([init/1, terminate/2, handle_call/3, handle_cast/2, code_change/3, + handle_info/2]). + +-export([start_link/0,track_file/1,get_stats/0]). + +-record(stats,{ + opened=0, + closed=0 + }). + + +track_file(Fd) -> + catch gen_server:cast(couch_file_stats, {track, Fd}). + + +get_stats() -> + #stats{opened=Opened,closed=Closed}=gen_server:call(couch_file_stats,get), + {ok, [{opened,Opened}, {closed,Closed}]}. + + +start_link() -> + gen_server:start_link({local, couch_file_stats}, couch_file_stats, [], []). + + +init([]) -> + {ok, #stats{}}. + + +terminate(_Reason, _Fd) -> + ok. + + +handle_call(get, _From, Stats) -> + {reply, Stats, Stats}. + + +handle_cast({track, Fd}, #stats{opened=Opened,closed=Closed}=Stats) -> + try erlang:monitor(process, Fd) of + _Ref -> + {noreply, Stats#stats{opened=Opened+1}} + catch + _Error -> + {noreply, Stats#stats{opened=Opened+1, closed=Closed+1}} + end. + + +handle_info({'DOWN',_MonRef,_Type,_Pid,_Info}, #stats{closed=Closed}=Stats) -> + {noreply, Stats#stats{closed=Closed+1}}. + + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. + -- cgit v1.2.3