溪客(编程代码)

exchange-header

头部交换机，header，web请求时传递参数的一个地方，这里也是类似，它是根据header中的参数来匹配对应的队列

约定：header["x-match"]，这是一个特殊的header，取值all或any，all指全部都匹配才匹配，any指只要有一个参数匹配则匹配

定义队列，这里需要指定x-match

Dictionary<string, object> aHeader = new Dictionary<string, object>();
aHeader.Add("format", "pdf");
aHeader.Add("type", "report");
aHeader.Add("x-match", "all");
channel.QueueBind(queue: "queue.A",
                    exchange: "agreements",
                    routingKey: string.Empty,
                    arguments: aHeader);

发布消息指定header，注意，这里不需要指定x-match

var properties = channel.CreateBasicProperties();
properties.Persistent = true;
Dictionary<string, object> mHeader1 = new Dictionary<string, object>();
mHeader1.Add("format", "pdf");
mHeader1.Add("type", "report");
properties.Headers = mHeader1;

channel.BasicPublish(exchange: "agreements",
                   routingKey: string.Empty,
                   basicProperties: properties,
                   body: body);

更多代码

var factory = new ConnectionFactory() { HostName = "localhost" };
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
    // Headers类型的exchange, 名称 agreements
    channel.ExchangeDeclare(exchange: "agreements",
                            type: ExchangeType.Headers,
                            durable: true,
                            autoDelete: false,
                            arguments: null);

    // 创建queue.A队列
    channel.QueueDeclare(queue: "queue.A", durable: true, exclusive: false, autoDelete: false, arguments: null);

    //创建 queue.B 队列
    channel.QueueDeclare(queue: "queue.B", durable: true, exclusive: false, autoDelete: false, arguments: null);

    //创建 queue.C 队列
    channel.QueueDeclare(queue: "queue.C", durable: true, exclusive: false, autoDelete: false, arguments: null);

    //绑定 agreements --> queue.A 使用arguments (format=pdf, type=report, x-match=all)
    Dictionary<string, object> aHeader = new Dictionary<string, object>();
    aHeader.Add("format", "pdf");
    aHeader.Add("type", "report");
    aHeader.Add("x-match", "all");
    channel.QueueBind(queue: "queue.A",
                        exchange: "agreements",
                        routingKey: string.Empty,
                        arguments: aHeader);

    //绑定 agreements --> queue.B 使用arguments (format=pdf, type=log, x-match=any)
    Dictionary<string, object> bHeader = new Dictionary<string, object>();
    bHeader.Add("format", "pdf");
    bHeader.Add("type", "log");
    bHeader.Add("x-match", "any");
    channel.QueueBind(queue: "queue.B",
                        exchange: "agreements",
                        routingKey: string.Empty,
                        arguments: bHeader);

    //绑定 agreements --> queue.C 使用arguments (format=zip, type=report, x-match=all)
    Dictionary<string, object> cHeader = new Dictionary<string, object>();
    cHeader.Add("format", "zip");
    cHeader.Add("type", "report");
    cHeader.Add("x-match", "all");
    channel.QueueBind(queue: "queue.C",
                        exchange: "agreements",
                        routingKey: string.Empty,
                        arguments: cHeader);


    string message1 = "hello world";
    var body = Encoding.UTF8.GetBytes(message1);
    var properties = channel.CreateBasicProperties();
    properties.Persistent = true;
    Dictionary<string, object> mHeader1 = new Dictionary<string, object>();
    mHeader1.Add("format", "pdf");
    mHeader1.Add("type", "report");
    properties.Headers = mHeader1;
    //此消息路由到 queue.A 和 queue.B
    //queue.A 的binding (format=pdf, type=report, x-match=all)
    //queue.B 的binding (format = pdf, type = log, x - match = any)
    channel.BasicPublish(exchange: "agreements",
                            routingKey: string.Empty,
                            basicProperties: properties,
                            body: body);


    string message2 = "hello world";
    body = Encoding.UTF8.GetBytes(message2);
    properties = channel.CreateBasicProperties();
    properties.Persistent = true;
    Dictionary<string, object> mHeader2 = new Dictionary<string, object>();
    mHeader2.Add("type", "log");
    properties.Headers = mHeader2;
    //x-match 配置queue.B 
    //queue.B 的binding (format = pdf, type = log, x-match = any)
    channel.BasicPublish(exchange: "agreements",
                    routingKey: string.Empty,
                    basicProperties: properties,
                    body: body);

    string message3= "hello world";
    body = Encoding.UTF8.GetBytes(message3);
    properties = channel.CreateBasicProperties();
    properties.Persistent = true;
    Dictionary<string, object> mHeader3 = new Dictionary<string, object>();
    mHeader3.Add("format", "zip");
    properties.Headers = mHeader3;
    //配置失败，不会被路由
    channel.BasicPublish(exchange: "agreements",
                    routingKey: string.Empty,
                    basicProperties: properties,
                    body: body);


}