diff options
author | Adam Kocoloski <adam@cloudant.com> | 2010-08-11 15:22:33 -0400 |
---|---|---|
committer | Adam Kocoloski <adam@cloudant.com> | 2010-08-11 17:39:37 -0400 |
commit | 81bdbed444df2cbcf3cdb32f7d4a74019de06454 (patch) | |
tree | eade7d0d9bb4cac01b55fd8642adfe0f7da35161 /src/couchdb/couch_work_queue.erl | |
parent | cc1910f73fbd20c5ffc94bd61e7701d7f5e4c92a (diff) |
reorganize couch .erl and driver code into rebar layout
Diffstat (limited to 'src/couchdb/couch_work_queue.erl')
-rw-r--r-- | src/couchdb/couch_work_queue.erl | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/src/couchdb/couch_work_queue.erl b/src/couchdb/couch_work_queue.erl deleted file mode 100644 index decfcad8..00000000 --- a/src/couchdb/couch_work_queue.erl +++ /dev/null @@ -1,115 +0,0 @@ -% 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_work_queue). --behaviour(gen_server). - --export([new/2,queue/2,dequeue/1,dequeue/2,close/1]). --export([init/1, terminate/2, handle_call/3, handle_cast/2, code_change/3, handle_info/2]). - --record(q, { - queue=queue:new(), - blocked=[], - max_size, - max_items, - items=0, - size=0, - work_waiter=nil, - close_on_dequeue=false -}). - -new(MaxSize, MaxItems) -> - gen_server:start_link(couch_work_queue, {MaxSize, MaxItems}, []). - -queue(Wq, Item) -> - gen_server:call(Wq, {queue, Item}, infinity). - -dequeue(Wq) -> - dequeue(Wq, all). - -dequeue(Wq, MaxItems) -> - try gen_server:call(Wq, {dequeue, MaxItems}, infinity) - catch - _:_ -> closed - end. - -close(Wq) -> - gen_server:cast(Wq, close). - - -init({MaxSize,MaxItems}) -> - {ok, #q{max_size=MaxSize, max_items=MaxItems}}. - -terminate(_Reason, #q{work_waiter=nil}) -> - ok; -terminate(_Reason, #q{work_waiter={WWFrom, _}}) -> - gen_server:reply(WWFrom, closed). - -handle_call({queue, Item}, From, #q{work_waiter=nil}=Q0) -> - Q = Q0#q{size=Q0#q.size + byte_size(term_to_binary(Item)), - items=Q0#q.items + 1, - queue=queue:in(Item, Q0#q.queue)}, - case (Q#q.size >= Q#q.max_size) orelse - (Q#q.items >= Q#q.max_items) of - true -> - {noreply, Q#q{blocked=[From | Q#q.blocked]}}; - false -> - {reply, ok, Q} - end; -handle_call({queue, Item}, _From, #q{work_waiter={WWFrom, _Max}}=Q) -> - gen_server:reply(WWFrom, {ok, [Item]}), - {reply, ok, Q#q{work_waiter=nil}}; -handle_call({dequeue, _Max}, _From, #q{work_waiter=WW}) when WW /= nil -> - exit("Only one caller allowed to wait for work at a time"); -handle_call({dequeue, Max}, From, #q{items=0}=Q) -> - {noreply, Q#q{work_waiter={From, Max}}}; -handle_call({dequeue, Max}, _From, #q{queue=Queue, max_size=MaxSize, - max_items=MaxItems, items=Items,close_on_dequeue=Close}=Q) -> - if Max >= Items orelse Max == all -> - [gen_server:reply(From, ok) || From <- Q#q.blocked], - Q2 = #q{max_size=MaxSize, max_items=MaxItems}, - if Close -> - {stop, normal, {ok, queue:to_list(Queue)}, Q2}; - true -> - {reply, {ok, queue:to_list(Queue)}, Q2} - end; - true -> - {DequeuedItems, Queue2, Blocked2} = - dequeue_items(Max, Queue, Q#q.blocked, []), - {reply, {ok, DequeuedItems}, - Q#q{items=Items-Max,blocked=Blocked2,queue=Queue2}} - end. - -dequeue_items(0, Queue, Blocked, DequeuedAcc) -> - {lists:reverse(DequeuedAcc), Queue, Blocked}; -dequeue_items(NumItems, Queue, Blocked, DequeuedAcc) -> - {{value, Item}, Queue2} = queue:out(Queue), - case Blocked of - [] -> - Blocked2 = Blocked; - [From|Blocked2] -> - gen_server:reply(From, ok) - end, - dequeue_items(NumItems-1, Queue2, Blocked2, [Item | DequeuedAcc]). - - -handle_cast(close, #q{items=0}=Q) -> - {stop, normal, Q}; -handle_cast(close, Q) -> - {noreply, Q#q{close_on_dequeue=true}}. - - -code_change(_OldVsn, State, _Extra) -> - {ok, State}. - -handle_info(X, Q) -> - {stop, X, Q}. |