rabbitmq 学习10channel 说明

rabbitmq java api 关于消息处理的一个重要的类是channel
channel 主要进行相关定义，发送消息，获取消息，事务处理等。
channel可以在多线程中使用，但是在任何时候保证只有一个线程执行命令是很重要的，这在前面 rabbitmq 学习-6-rabbitmq基础 已经说的很清楚了。

public interface Channel extends ShutdownNotifier {

// 重新得到channel number
int getChannelNumber();

//得到当前channel的connection
Connection getConnection();

//关闭 channel，closeCode=com.rabbitmq.client.AMQP#REPLY_SUCCESS，closeMessage='OK'
void close() throws IOException;

//指定code和message关闭channel
void close(int closeCode, String closeMessage) throws IOException;

 //中止 channel，closeCode=com.rabbitmq.client.AMQP#REPLY_SUCCESS，closeMessage='OK'
 //此操作中的所有异常将被丢弃
void abort() throws IOException;

//指定code和message中止channel
//此操作中的所有异常将被丢弃
void abort(int closeCode, String closeMessage) throws IOException;

//得到当前channel的ReturnListener
ReturnListener getReturnListener();

//设置当前channel的ReturnListener
void setReturnListener(ReturnListener listener);

/**
 * Request specific "quality of service" settings.
 *
 * These settings impose limits on the amount of data the server
 * will deliver to consumers before requiring the receipt of
 * acknowledgements.
 * Thus they provide a means of consumer-initiated flow control.
 * @see com.rabbitmq.client.AMQP.Basic.Qos
 * @param prefetchSize maximum amount of content (measured in
 * octets) that the server will deliver, 0 if unlimited
 * @param prefetchCount maximum number of messages that the server
 * will deliver, 0 if unlimited
 * @param global true if the settings should be applied to the
 * entire connection rather than just the current channel
 * @throws java.io.IOException if an error is encountered
 */
void basicQos(int prefetchSize, int prefetchCount, boolean global) throws IOException;

/**
 * Request a specific prefetchCount "quality of service" settings
 * for this channel.
 *
 * @see #basicQos(int, int, boolean)
 * @param prefetchCount maximum number of messages that the server
 * will deliver, 0 if unlimited
 * @throws java.io.IOException if an error is encountered
 */
void basicQos(int prefetchCount) throws IOException;

//发送消息，"mandatory" and "immediate" 都是 false
void basicPublish(String exchange, String routingKey, BasicProperties props, byte[] body) throws IOException;

/**
 * 发送消息
 * @param exchange名称
 * @param routingKey名称
 * @param mandatory 是否强制发送
 * @param immediate 是否立即发送
 * @param props other properties for the message - routing headers etc
 * @param body 消息
 * @throws java.io.IOException if an error is encountered
 */
void basicPublish(String exchange, String routingKey, boolean mandatory, boolean immediate, BasicProperties props, byte[] body)
        throws IOException;

/**
 * 删除exchange，不管是否在使用
 * @param exchange名称
 * @return a deletion-confirm method to indicate the exchange was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Exchange.DeleteOk exchangeDelete(String exchange) throws IOException;

/**
 * 删除exchange
 * @param exchange名称
 * @param ifUnused 设置是否只删除没有使用的
 * @return a deletion-confirm method to indicate the exchange was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Exchange.DeleteOk exchangeDelete(String exchange, boolean ifUnused) throws IOException;

/**
 * 定义exchange，non-autodelete, non-durable
 * @param exchange名称
 * @param exchange类型
 * @return a deletion-confirm method to indicate the exchange was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Exchange.DeclareOk exchangeDeclare(String exchange, String type) throws IOException;

/**
 * 定义exchange，non-autodelete
 * @param exchange名称
 * @param exchange类型
 * @param durable 是否持续存在(持续存在，即使server重启也会存在)
 * @throws java.io.IOException if an error is encountered
 * @return a declaration-confirm method to indicate the exchange was successfully declared
 */
Exchange.DeclareOk exchangeDeclare(String exchange, String type, boolean durable) throws IOException;

/**
 * 定义exchange
 * @param exchange名称
 * @param exchange类型
 * @param passive true if we are passively declaring a exchange (asserting the exchange already exists)
 * @param durable 是否持续存在(持续存在，即使server重启也会存在)
 * @param autoDelete 是否自动删除，自动删除-server会在它不在使用的时候将其删除
 * @param arguments other properties (construction arguments) for the exchange
 * @return a declaration-confirm method to indicate the exchange was successfully declared
 * @throws java.io.IOException if an error is encountered
 */
Exchange.DeclareOk exchangeDeclare(String exchange, String type, boolean passive, boolean durable, boolean autoDelete,
                                   Map<String, Object> arguments) throws IOException;

/**
 * 定义一个queue，由server去命名，exclusive, autodelete, non-durable
 * @return a declaration-confirm method to indicate the exchange was successfully declared
 * @throws java.io.IOException if an error is encountered
 */
Queue.DeclareOk queueDeclare() throws IOException;

/**
 * 定义一个queue，non-exclusive, non-autodelete, non-durable
 * @param queue 名称
 * @return a declaration-confirm method to indicate the queue was successfully declared
 * @throws java.io.IOException if an error is encountered
 */
Queue.DeclareOk queueDeclare(String queue) throws IOException;

/**
 * 定义一个queue，non-exclusive, non-autodelete
 * @param queue 名称
 * @param durable 是否持续存在(true：server重启也会存在)
 * @return a declaration-confirm method to indicate the exchange was successfully declared
 * @throws java.io.IOException if an error is encountered
 */
Queue.DeclareOk queueDeclare(String queue, boolean durable) throws IOException;

/**
 * 定义一个queue
 * @param queue 名称
 * @param passive true if we are passively declaring a queue (asserting the queue already exists)
 * @param durable 是否持续存在
 * @param exclusive true if we are declaring an exclusive queue
 * @param autoDelete 是否自动删除，true：不在使用了server将会自动删除它
 * @param arguments other properties (construction arguments) for the queue
 * @return a declaration-confirm method to indicate the queue was successfully declared
 * @throws java.io.IOException if an error is encountered
 */
Queue.DeclareOk queueDeclare(String queue, boolean passive, boolean durable, boolean exclusive, boolean autoDelete,
                             Map<String, Object> arguments) throws IOException;

/**
 * 删除queue，不管它是否在使用
 * @param queue 名称
 * @return a deletion-confirm method to indicate the queue was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Queue.DeleteOk queueDelete(String queue) throws IOException;

/**
 * 删除queue
 * @param queue 名称
 * @param ifUnused 是否只删除没有被使用的queue
 * @param ifEmpty 是否只删除消息是空的queue
 * @return a deletion-confirm method to indicate the queue was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Queue.DeleteOk queueDelete(String queue, boolean ifUnused, boolean ifEmpty) throws IOException;

/**
 * 使用routingKey将queue绑定到exchange上
 * @param queue 名称
 * @param exchange the name of the exchange
 * @param routingKey the routine key to use for the binding
 * @return a binding-confirm method if the binding was successfully created
 * @throws java.io.IOException if an error is encountered
 */
Queue.BindOk queueBind(String queue, String exchange, String routingKey) throws IOException;

/**
 * 使用routingKey将queue绑定到exchange上，带参数
 * @param queue the name of the queue
 * @param exchange the name of the exchange
 * @param routingKey the routine key to use for the binding
 * @param arguments other properties (binding parameters)
 * @return a binding-confirm method if the binding was successfully created
 * @throws java.io.IOException if an error is encountered
 */
Queue.BindOk queueBind(String queue, String exchange, String routingKey, Map<String, Object> arguments) throws IOException;

/**
 * 解除绑定
 * @param queue the name of the queue
 * @param exchange the name of the exchange
 * @param routingKey the routine key to use for the binding
 * @return an unbinding-confirm method if the binding was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Queue.UnbindOk queueUnbind(String queue, String exchange, String routingKey) throws IOException;

/**
 * 解除绑定，带参数
 * @param queue the name of the queue
 * @param exchange the name of the exchange
 * @param routingKey the routine key to use for the binding
 * @param arguments other properties (binding parameters)
 * @return an unbinding-confirm method if the binding was successfully deleted
 * @throws java.io.IOException if an error is encountered
 */
Queue.UnbindOk queueUnbind(String queue, String exchange, String routingKey, Map<String, Object> arguments) throws IOException;

/**
 * Purges the contents of the given queue and awaits a completion.
 * @see com.rabbitmq.client.AMQP.Queue.Purge
 * @see com.rabbitmq.client.AMQP.Queue.PurgeOk
 * @param queue the name of the queue
 * @return a purge-confirm method if the purge was executed succesfully
 * @throws java.io.IOException if an error is encountered
 */
Queue.PurgeOk queuePurge(String queue) throws IOException;

/**
 * Purges the contents of the given queue.
 * @see com.rabbitmq.client.AMQP.Queue.Purge
 * @see com.rabbitmq.client.AMQP.Queue.PurgeOk
 * @param queue the name of the queue
 * @param nowait whether to await completion of the purge
 * @return a purge-confirm method if the purge was executed succesfully
 * @throws java.io.IOException if an error is encountered
 */
Queue.PurgeOk queuePurge(String queue, boolean nowait) throws IOException;

/**
 * 从queue上取消息
 * @param queue the name of the queue
 * @param noAck true if no handshake is required
 * @return a {@link GetResponse} containing the retrieved message data
 * @throws java.io.IOException if an error is encountered
 */
GetResponse basicGet(String queue, boolean noAck) throws IOException;

/**
 * Acknowledge one or several received
 * messages. Supply the deliveryTag from the {@link com.rabbitmq.client.AMQP.Basic.GetOk}
 * or {@link com.rabbitmq.client.AMQP.Basic.Deliver} method
 * containing the received message being acknowledged.
 * @see com.rabbitmq.client.AMQP.Basic.Ack
 * @param deliveryTag the tag from the received {@link com.rabbitmq.client.AMQP.Basic.GetOk} or {@link com.rabbitmq.client.AMQP.Basic.Deliver}
 * @param multiple true if we are acknowledging multiple messages with the same delivery tag
 * @throws java.io.IOException if an error is encountered
 */
void basicAck(long deliveryTag, boolean multiple) throws IOException;

/**
 * Start a non-nolocal, non-exclusive consumer, with
 * explicit acknowledgements required and a server-generated consumerTag.
 * @param queue the name of the queue
 * @param callback an interface to the consumer object
 * @return the consumerTag generated by the server
 * @throws java.io.IOException if an error is encountered
 * @see com.rabbitmq.client.AMQP.Basic.Consume
 * @see com.rabbitmq.client.AMQP.Basic.ConsumeOk
 * @see #basicAck
 * @see #basicConsume(String,boolean, String,boolean,boolean, Consumer)
 */
String basicConsume(String queue, Consumer callback) throws IOException;

/**
 * Start a non-nolocal, non-exclusive consumer, with
 * a server-generated consumerTag.
 * @param queue the name of the queue
 * @param noAck true if no handshake is required
 * @param callback an interface to the consumer object
 * @return the consumerTag generated by the server
 * @throws java.io.IOException if an error is encountered
 * @see com.rabbitmq.client.AMQP.Basic.Consume
 * @see com.rabbitmq.client.AMQP.Basic.ConsumeOk
 * @see #basicConsume(String,boolean, String,boolean,boolean, Consumer)
 */
String basicConsume(String queue, boolean noAck, Consumer callback) throws IOException;

/**
 * Start a non-nolocal, non-exclusive consumer.
 * @param queue the name of the queue
 * @param noAck true if no handshake is required
 * @param consumerTag a client-generated consumer tag to establish context
 * @param callback an interface to the consumer object
 * @return the consumerTag associated with the new consumer
 * @throws java.io.IOException if an error is encountered
 * @see com.rabbitmq.client.AMQP.Basic.Consume
 * @see com.rabbitmq.client.AMQP.Basic.ConsumeOk
 * @see #basicConsume(String,boolean, String,boolean,boolean, Consumer)
 */
String basicConsume(String queue, boolean noAck, String consumerTag, Consumer callback) throws IOException;

/**
 * Start a consumer. Calls the consumer's {@link Consumer#handleConsumeOk}
 * method before returning.
 * @param queue the name of the queue
 * @param noAck true if no handshake is required
 * @param consumerTag a client-generated consumer tag to establish context
 * @param noLocal flag set to true unless server local buffering is required
 * @param exclusive true if this is an exclusive consumer
 * @param callback an interface to the consumer object
 * @return the consumerTag associated with the new consumer
 * @throws java.io.IOException if an error is encountered
 * @see com.rabbitmq.client.AMQP.Basic.Consume
 * @see com.rabbitmq.client.AMQP.Basic.ConsumeOk
 */
String basicConsume(String queue, boolean noAck, String consumerTag, boolean noLocal, boolean exclusive, Consumer callback) throws IOException;

/**
 * Cancel a consumer. Calls the consumer's {@link Consumer#handleCancelOk}
 * method before returning.
 * @param consumerTag a client- or server-generated consumer tag to establish context
 * @throws java.io.IOException if an error is encountered
 * @see com.rabbitmq.client.AMQP.Basic.Cancel
 * @see com.rabbitmq.client.AMQP.Basic.CancelOk
 */
void basicCancel(String consumerTag) throws IOException;

/**
 * Ask the broker to resend unacknowledged messages.  In 0-8
 * basic.recover is asynchronous; in 0-9-1 it is synchronous, and
 * the new, deprecated method basic.recover_async is asynchronous.
 * To avoid this API changing, this is named for the latter, and
 * will be deprecated.
 * @param requeue If true, messages will be requeued and possibly
 * delivered to a different consumer. If false, messages will be
 * redelivered to the same consumer.
 */
void basicRecoverAsync(boolean requeue) throws IOException;

/**
 * 启用事务模式
 * @return a transaction-selection method to indicate the transaction was successfully initiated
 * @throws java.io.IOException if an error is encountered
 */
Tx.SelectOk txSelect() throws IOException;

/**
 * 提交事务
 * @return a transaction-commit method to indicate the transaction was successfully committed
 * @throws java.io.IOException if an error is encountered
 */
Tx.CommitOk txCommit() throws IOException;

/**
 * 回流事务
 * @return a transaction-rollback method to indicate the transaction was successfully rolled back
 * @throws java.io.IOException if an error is encountered
 */
Tx.RollbackOk txRollback() throws IOException;
}