[Pkg-javascript-commits] [node-channels] 01/09: Imported Upstream version 0.0.5
Mike Gabriel
sunweaver at debian.org
Tue Aug 19 17:50:56 UTC 2014
This is an automated email from the git hooks/post-receive script.
sunweaver pushed a commit to branch master
in repository node-channels.
commit ee82b3097e52996b8b2bd7514dcd14afdb0d9cb6
Author: Mike Gabriel <mike.gabriel at das-netzwerkteam.de>
Date: Thu May 9 15:49:01 2013 +0200
Imported Upstream version 0.0.5
---
LICENSE | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
README.md | 48 ++++++++++++++
benchmark.js | 32 ++++++++++
channels.js | 75 ++++++++++++++++++++++
package.json | 8 +++
5 files changed, 365 insertions(+)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a35c255
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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+ Copyright 2012 THE ETHERPAD FOUNDATION
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..421d61c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,48 @@
+# Channels
+
+Channels keeps your messages in order for different endpoints(channels) of your nodeJS application.
+
+In Etherpad Channels is used to ensure changes for specific pads have their own channel (gateway) and changesets (planes) are assigned to specific channels (gateways).
+
+Channels is useful if you need to have lots of different IO operations on different endpoints that you need to keep in order.
+
+# Example
+
+```js
+/*
+ Imagine we have an airport with 2 gateways. Every gateway can only be used by one plane at the same time.
+ The planes should land in the order they registered their landing at the airport
+*/
+
+var channels = require("channels");
+
+function doLanding(landing, callback)
+{
+ setTimeout(function()
+ {
+ console.log(new Date().toString() + " " +landing.planeName + " landed on " + landing.gateway);
+ callback();
+ },1000);
+}
+
+var airport = new channels.channels(doLanding);
+
+airport.emit("gateway1", {planeName: "superjet1", gateway: "gateway1"});
+airport.emit("gateway2", {planeName: "superjet2", gateway: "gateway2"});
+
+airport.emit("gateway1", {planeName: "superjet3", gateway: "gateway1"});
+airport.emit("gateway2", {planeName: "superjet4", gateway: "gateway2"});
+
+airport.emit("gateway1", {planeName: "superjet5", gateway: "gateway1"});
+airport.emit("gateway2", {planeName: "superjet6", gateway: "gateway2"});
+```
+## Output
+
+<pre>
+Thu Jul 28 2011 18:44:52 GMT+0100 (BST) superjet1 landed on gateway1
+Thu Jul 28 2011 18:44:52 GMT+0100 (BST) superjet2 landed on gateway2
+Thu Jul 28 2011 18:44:53 GMT+0100 (BST) superjet3 landed on gateway1
+Thu Jul 28 2011 18:44:53 GMT+0100 (BST) superjet4 landed on gateway2
+Thu Jul 28 2011 18:44:54 GMT+0100 (BST) superjet5 landed on gateway1
+Thu Jul 28 2011 18:44:54 GMT+0100 (BST) superjet6 landed on gateway2
+</pre>
diff --git a/benchmark.js b/benchmark.js
new file mode 100644
index 0000000..4d7300f
--- /dev/null
+++ b/benchmark.js
@@ -0,0 +1,32 @@
+/**
+ * 2011 Peter 'Pita' Martischka
+ *
+ * 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.
+ */
+
+var channels = require("./channels");
+
+function doOperation(operation, callback)
+{
+ process.nextTick(callback);
+}
+
+var channelObj = new channels.channels(doOperation);
+
+for(var i=0;i<2500000;i++)
+{
+ for(var channel=0;channel<10;channel++)
+ {
+ channelObj.emit(channel);
+ }
+}
diff --git a/channels.js b/channels.js
new file mode 100644
index 0000000..08b9df9
--- /dev/null
+++ b/channels.js
@@ -0,0 +1,75 @@
+/**
+ * 2011 Peter 'Pita' Martischka
+ *
+ * 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.
+ */
+
+var domain;
+try {
+ domain = require('domain');
+} catch(e){
+ //domains only exist in 0.8+
+}
+
+exports.channels = function(operatorFunction)
+{
+ this.channels = {};
+ this.operatorFunction = operatorFunction;
+}
+
+exports.channels.prototype.emit = function(channelname, object)
+{
+ var _this = this;
+
+ //this channel already exists, add it to the queue
+ if(_this.channels[channelname])
+ {
+ if(domain && domain.active){
+ object.__domain = domain.active;
+ }
+
+ _this.channels[channelname].push(object);
+ }
+ //this channel is new, create it and start it
+ else
+ {
+ //create the channel array
+ _this.channels[channelname] = [];
+
+ _this.operatorFunction(object, function iterator()
+ {
+ //get the next element
+ var next = _this.channels[channelname].shift();
+
+ //if there is nothing todo anymore in this channel, clean it up
+ if(next !== undefined)
+ {
+ // if this method has a domain, call it in the domain
+ if(next.__domain){
+ var activeDomain = next.__domain;
+ delete next.__domain;
+
+ activeDomain.run(function(){
+ _this.operatorFunction(next, iterator);
+ });
+ } else {
+ _this.operatorFunction(next, iterator);
+ }
+ }
+ else
+ {
+ delete _this.channels[channelname];
+ }
+ });
+ }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..91bdda9
--- /dev/null
+++ b/package.json
@@ -0,0 +1,8 @@
+{
+ "name" : "channels",
+ "description" : "Event channels in node.js",
+ "keywords" : ["async", "flow control"],
+ "author" : "Peter 'Pita' Martischka <petermartischka at googlemail.com>",
+ "main" : "channels.js",
+ "version" : "0.0.4"
+}
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