Simple Message Queue (formerly MNS):BatchPeekMessage

Description

You can call this operation to query a maximum of 16 messages at a time. Different from the BatchReceiveMessage operation, the BatchPeekMessage operation does not change the status of the messages. After you call the BatchPeekMessage operation to view messages, the messages remain in the Active state and can still be viewed or consumed. However, if you call the BatchReceiveMessage operation to receive messages, the messages enter the Inactive state and cannot be viewed or consumed within the period specified by the VisibilityTimeout parameter.

Request

A request consists of the following parts:

• Request line

  GET /queues/$queueName/messages? peekonly=true&numOfMessages=16 HTTP/1.1

• Operation-specific URI parameter

  Parameter	Required	Description
  peekonly=true	Yes	Indicates that this request is used only to view messages in the queue and does not change the status of the messages.
  numOfMessages	Yes	Specifies the maximum number of messages that can be viewed at a time.

• Operation-specific request headers

  None.

• Request Body

  None.

Response

A response consists of the following parts:

• HTTP Status Code

  HTTP/1.1 200 OK

• Operation-specific response headers

  None.

• Response Body

  The response body is in the XML format. The body and parameters of multiple messages are returned.

  Parameter	Description
  MessageId	The ID of the message. In a queue, each message ID must be unique.
  MessageBody	The body of the message.
  MessageBodyMD5	The MD5 hash of the message body.
  EnqueueTime	The time when the message was sent to the queue. The value is a timestamp that follows the UNIX time format. It is the number of milliseconds that have elapsed since 00:00:00 Thursday, 1 January 1970.
  FirstDequeueTime	The time when the message was consumed for the first time. The value is a timestamp that follows the UNIX time format. It is the number of milliseconds that have elapsed since 00:00:00 Thursday, 1 January 1970. If the value of the DequeueCount parameter is 0, the value of the FirstDequeueTime parameter is the same as the value of the EnqueueTime parameter.
  DequeueCount	The total number of times for which the message was consumed.
  Priority	The priority of the message.

Examples

Sample requests

GET  /queues/$queueName/messages? peekonly=true&numOfMessages=16 HTTP/1.1
Host: $AccountId.mns.cn-hangzhou.aliyuncs.com
Date: Wed, 28 May 2012 22:32:00 GMT
x-mns-version: 2015-06-06
Authorization: MNS 15B4D3461F177624206A:xQE0diMbLRepdf3YB+FIEXA****            

Sample success responses

HTTP/1.1 200 OK
Connection:close
Content-Type=text/xml;charset=utf-8
Content-Length:500
x-mns-request-id:512B2A634403E52B1956****
x-mns-version: 2015-06-06

<? xml version="1.0" encoding="UTF-8"? >
<Messages xmlns="http://mns.aliyuncs.com/doc/v1/">
<Message>
    <MessageId>D6D5F7C9C12D14A4-1-14D953EFC72-20000****</MessageId>
    <MessageBodyMD5>F9360F391579E71CA77BC5D50242****</MessageBodyMD5>
    <MessageBody>This is a test message</MessageBody>
    <EnqueueTime>1250700979248</EnqueueTime>
    <FirstDequeueTime>1250700979348</FirstDequeueTime >
    <DequeueCount>5</DequeueCount>
    <Priority>8<Priority>
</Message>
<Message>
    <MessageId>D6D5F7C9C12D14A4-1-14D953EFC72-20000****</MessageId>
    <MessageBodyMD5>F9360F391579E71CA77BC5D50242****</MessageBodyMD5>
    <MessageBody>This is a test message</MessageBody>
    <EnqueueTime>1250700979250</EnqueueTime>
    <FirstDequeueTime>1250700979352</FirstDequeueTime >
    <DequeueCount>5</DequeueCount>
    <Priority>8<Priority>
</Message>
</Messages>            

Special error