var amqp = require('amqp')
1.一个发送者，多个消费者。exchange发送3条消息,每个队列接收3条消息相同
connection.on('ready', function () {
var exchange = connection.exchange('exchange_name', {type: 'fanout',autoDelete:false});
connection.queue("queue_name",{autoDelete:false}, function(queue){
queue.bind('exchange_name','queue_name', function() {
exchange.publish('queue_name', 'this is message is testing ......');
exchange.publish('queue_name', 'this is message is testing3 ......')
setTimeout(function() {
console.log("Single queue bind callback succeeded");
//exchange.destroy();
//queue.destroy();node
connection.end();
connection.destroy();
}, 5000);
})
//同一个消息多次订阅同一个队列，只会收到一次消息
/*
ack:true,确认收到一条消息后，后续对列中的消息接收不到
prefetchCount:每个消费者接收的消息平均，
*/
// queue.subscribe({ack:true,prefetchCount:1},function (message) {
// console.log('2At 5 second recieved message is:'+ message.data);
// });
// queue.subscribe({ack:true,prefetchCount:1},function (message) {
// console.log('At 5 second recieved message is:'+ message.data);
// });
queue.subscribe(function (message) {
console.log('2At 5 second recieved message is:'+ message.data);
});
// queue.subscribe(function (message) {
// console.log('1 5 second recieved message is:'+ message.data);
// });
})
connection.queue("queue_name1",{autoDelete:false}, function(queue){
queue.bind('exchange_name','queue_name1', function() {
exchange.publish('queue_name1', 'this is queue_name1 is testing4 ......')
})
queue.subscribe(function (message) {
console.log('queue_name1 5 second recieved message is:'+ message.data);
});
})
})
打印：
queue_name1 5 second recieved message is:this is message is testing ......
2At 5 second recieved message is:this is message is testing ......
2At 5 second recieved message is:this is message is testing3 ......
queue_name1 5 second recieved message is:this is message is testing3 ......
2At 5 second recieved message is:this is queue_name1 is testing4 ......
queue_name1 5 second recieved message is:this is queue_name1 is testing4 ......
2.exchange的type为direct，每个个队列，只能收到指定的队列消息
connection.on('ready', function () {
var exchange = connection.exchange('exchange_name2', {type: 'direct',autoDelete:false});
connection.queue("queue_name",{autoDelete:false}, function(queue){
queue.bind('exchange_name2','queue_name', function() {
exchange.publish('queue_name', 'this is message is testing ......');
exchange.publish('queue_name', 'this is message is testing2222 ......');
setTimeout(function() {
console.log("Single queue bind callback succeeded");
//exchange.destroy();
//queue.destroy();
connection.end();
connection.destroy();
}, 5000)
})
queue.subscribe(function (message) {
console.log('At 2:'+ message.data);
})
queue.subscribe(function (message) {
console.log('At 1:'+ message.data);
})
})
connection.queue('q2',{autoDelete:false},function(q){
q.bind('exchange_name2','q2',function(){
exchange.publish('q2','is form q2')
})
q.subscribe(function(msg){
console.log("q2: "+msg.data)
})
})
})
打印：
At 2:this is message is testing ......
At 1:this is message is testing2222 ......
q2: is form q2
3.参数尝试,echange,queue,publish持久化
const amqp = require('amqp');
var connection = amqp.createConnection( {
host: '127.0.0.1'
, port: 5672
, login: 'test'
, password: '123'
, vhost: '/test'
});
connection.on('error', function(err) {
console.log('Connection error', err);
});
connection.on('ready', function () {
// Options
// - type 'fanout', 'direct', or 'topic' (default)
// - passive (boolean)
// - durable (boolean)
// - autoDelete (boolean, default true)
var exchange = connection.exchange('exchange_name', {type: 'fanout',autoDelete:false});
// - passive (boolean)
// - durable (boolean)持久化
// - exclusive (boolean)
// - autoDelete (boolean, default true)
//'arguments': {'x-expires': 3600000}
connection.queue("queue_name8",{autoDelete:false,durable:true}, function(queue){
queue.bind('exchange_name','queue_name8', function() {
// the third argument can specify additional options
// - mandatory (boolean, default false)
// - immediate (boolean, default false)
// - contentType (default 'application/octet-stream')
// - contentEncoding
// - headers
// - deliveryMode
// - priority (0-9)
// - correlationId
// - replyTo
// - expiration
// - messageId
// - timestamp
// - userId
// - appId
// - clusterId
//
exchange.publish('queue_name8', 'this is message is testing ......',{deliveryMode:2});
exchange.publish('queue_name8', 'this is message is testing3 ......',{deliveryMode:2})
setTimeout(function() {
console.log("Single queue bind callback succeeded");
//exchange.destroy();
//queue.destroy();node
connection.end();
connection.destroy();
}, 5000);
})
//同一个消息多次订阅同一个队列，只会收到一次消息
/*
ack:true,确认收到一条消息后，后续对列中的消息接收不到，如果需要下条消息,调用q.shift()
prefetchCount:每个消费者接收的消息平均，
*/
// queue.subscribe({ack:true,prefetchCount:1},function (message) {
// console.log('2At 5 second recieved message is:'+ message.data);
// });
// queue.subscribe({ack:true,prefetchCount:1},function (message) {
// console.log('At 5 second recieved message is:'+ message.data);
// });
queue.subscribe(function (message) {
console.log('2At 5 second recieved message is:'+ message.data);
});
// queue.subscribe(function (message) {
// console.log('1 5 second recieved message is:'+ message.data);
// });
})
connection.queue("queue_name9",{autoDelete:false,durable:true}, function(queue){
queue.bind('exchange_name','queue_name9', function() {
exchange.publish('queue_name9', 'this is queue_name1 is testing4 ......',{deliveryMode:2})
})
queue.subscribe(function (message) {
console.log('queue_name1 7 second recieved message is:'+ message.data);
});
})
})
4.确认收到消息，继续接收消息
var queName = 'test_q3',ex='test_ex';
connection.on('ready',function(){
var ex = connection.exchange(`${ex}`,{type:'fanout',durable:true,autoDelete:false});
connection.queue(`${queName}`,{durable:true,autoDelete:false},function(q){
q.bind(ex,queName,function(){
ex.publish(queName,'test msg1',{deliveryMode:2})
ex.publish(queName,'test msg2 msg2',{deliveryMode:2})
})
setTimeout(function() {
console.log("Single queue bind callback succeeded");
//exchange.destroy();
//queue.destroy();node
connection.end();
connection.destroy();
},1000);
q.subscribe({ack:true,prefetchCount:1},function(msg){
q.shift()
console.log('receive msg : '+msg.data);
})
})
})
注意：同一个exhcange中的queuename,exhcange,type方式一旦在程序中确定，就不能改变