Hopiu/postal.js
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Adding subscribtion-created, subcsription-removed event publishes to wiretaps on subscribe/unsubscribe.

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This commit is contained in:
Alex Robson 2012-02-22 16:41:34 -05:00
parent 14864b5135
commit 8d0c8d361e
2 changed files with 44 additions and 5 deletions
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29
spec/Postal.spec.js
View file

@ -2,9 +2,18 @@ QUnit.specify("postal.js", function(){
describe("Postal", function(){
var subscription,
sub,
channel;
channel,
gotSubscriptionFromTap;
describe("when creating basic subscription", function() {
before(function(){
postal.addWireTap(function(x,y){
if( x.event &&
x.event == "subscription-created" &&
x.exchange == "MyExchange" &&
x.topic == "MyTopic") {
gotSubscriptionFromTap = true;
}
});
subscription = postal.channel("MyExchange","MyTopic")
.subscribe(function() { });
sub = postal.configuration.bus.subscriptions.MyExchange.MyTopic[0];
@ -36,11 +45,24 @@ QUnit.specify("postal.js", function(){
it("should have defaulted the subscription context value", function() {
assert(sub.context).isNull();
});
it("should have captured subscription creation event in wire-tap", function() {
assert(gotSubscriptionFromTap).isTrue();
});
});
describe("when unsubscribing", function() {
var subExistsBefore = false,
subExistsAfter = true;
subExistsAfter = true,
gotUnsubscriptionFromTap = false;
before(function(){
postal.addWireTap(function(x,y){
if( x.event &&
x.event == "subscription-removed" &&
x.exchange == "MyExchange" &&
x.topic == "MyTopic") {
gotUnsubscriptionFromTap = true;
}
});
subscription = postal.channel("MyExchange","MyTopic")
.subscribe(function() { });
subExistsBefore = postal.configuration.bus.subscriptions.MyExchange.MyTopic[0] !== undefined;
@ -56,6 +78,9 @@ QUnit.specify("postal.js", function(){
it("subscription should not exist after unsubscribe", function(){
assert(subExistsAfter).isFalse();
});
it("should have captured unsubscription creation event in wire-tap", function() {
assert(gotUnsubscriptionFromTap).isTrue();
});
});
describe("When publishing a message", function(){
var msgReceivedCnt = 0,

20
src/main/LocalBus.js
View file

@ -5,9 +5,7 @@ var localBus = {
wireTaps: [],
publish: function(data, envelope) {
_.each(this.wireTaps,function(tap) {
tap(data, envelope);
});
this.notifyTaps(data, envelope);
_.each(this.subscriptions[envelope.exchange], function(topic) {
_.each(topic, function(binding){
@ -44,16 +42,32 @@ var localBus = {
}
if(!found) {
this.subscriptions[subDef.exchange][subDef.topic].unshift(subDef);
this.notifyTaps({
event: "subscription-created",
exchange: subDef.exchange,
topic: subDef.topic
}, {});
}
}
return _.bind(function() { this.unsubscribe(subDef); }, this);
},
notifyTaps: function(data, envelope) {
_.each(this.wireTaps,function(tap) {
tap(data, envelope);
});
},
unsubscribe: function(config) {
if(this.subscriptions[config.exchange][config.topic]) {
var len = this.subscriptions[config.exchange][config.topic].length,
idx = 0;
this.notifyTaps({
event: "subscription-removed",
exchange: config.exchange,
topic: config.topic
}, {});
for ( ; idx < len; idx++ ) {
if (this.subscriptions[config.exchange][config.topic][idx] === config) {
this.subscriptions[config.exchange][config.topic].splice( idx, 1 );