Developing applications reference


mq application programming reference

MQ applications.. Syncpoints in WebSphere MQ for z/OS applications.. Syncpoints in CICS Transaction Server for OS/ and CICS for MVS/ESA applications.. Syncpoints in IMS applications.. Syncpoints in z/OS batch applications. Syncpoints in CICS for AS/ applications Syncpoints in WebSphere MQ for Windows. WebSphere MQ Application Programming Guide SC Note! Before using this information and the product it supports, be sure to read the general information under Appendix G, Reference information Externalcontrolblocks Contents v. Feb 09,  · WebSphere MQ Application Programming Guide 2. WebSphere MQ Application Programming Reference 3. WebSphere MQ Clients 4. WebSphere MQ Message 5. WebSphere MQ Using the Component Object Model Interface. This is a tutorial allow you to undrestand and programming your solution:>.

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This article is targeting architects and developers who are looking for a way to integrate. This article is designed to provide a basic understanding of messaging from IBM perspective through the explanation of some basic functionalities of WebSphere MQ. The document is divided into three main parts:. Introduction to messaging : this is covered in sections 3 - 4. You can skip this part if you have a past experience with MSMQ. Interacting with WebSphere MQ: this is covered in sections 4. Message queuing has been used in data processing for many years.

It is most commonly used today in electronic mail. Without queuing, sending an electronic message over long distances requires every node on the route to be available for forwarding messages, and aware of the fact that you are trying to send them a message.

In a queuing system, messages are stored at intermediate nodes until the system is ready to forward them or process them. Even so, many complex business transactions are processed today without queuing.

If this is the case; then why do we need queuing? Think about a system consisting of multiple nodes, where those nodes need mq application programming reference communicate with each other. If one node of the system suffers a problem, many nodes could become unusable, mq application programming reference. In a message queuing environment, each program from the set that makes up the system is designed to perform a well-defined, self-contained function in response to a specific request.

To communicate with another program, a program must put a message on a predefined queue, mq application programming reference. The other program retrieves the message from the queue, and processes the message. So message queuing is a style of program-to-program communication, mq application programming reference.

Queuing is the mechanism by which messages are held until an application is ready to process them. Queuing allows you to:. In message queuing, a message is simply a collection of data sent mq application programming reference one program and intended mq application programming reference another program.

WebSphere MQ primarily defines four types of message:. A message consists of control information and application data. The control information is defined in a message descriptor structure MQMD and contains things like:. The structure and content of the application data is determined by the participating programs, not by WebSphere MQ. A message queuereferred to as a queue, mq application programming reference, is a named destination to which messages can be sent.

Messages accumulate on queues until they are retrieved by programs that service those queues. Queues reside in, and are managed by, a queue manager. A queue can either be a volatile buffer area in the memory of a computer, or a data set on a permanent storage device, such as a disk. The physical management of queues is the responsibility of the queue manager and is not made apparent to the participating application programs.

Programs access queues only through queue manager. They can open a queue, put messages, mq application programming reference messages, and they can close the queue. They can also set, and inquire about, the attributes of queues. A queue manager is a system program that provides queuing services to applications. It exposes an API that would allow programs to put, and get messages from queues. A queue manager provides additional functions that would provide administrators with the ability to create new queues, alter the properties of existing ones, and control the operation of the queue manager.

You can have more than one queue manager running on a single system for example, mq application programming reference, to separate the testing environment from the production one. To an application, each queue manager is identified by a connection handle Hconn. For a program to use the services of a queue manager, it must establish a connection to that queue manager.

For applications to be able to send messages to applications that are connected to other queue managers, queue managers must be able to communicate among themselves. WebSphere achieved this by implementing a store-and-forward protocol to ensure the safe delivery of messages between such applications. Applications can use the first three types of messages to pass information between themselves. The fourth type, report, mq application programming reference, is for applications and queue managers to report information about events such as the occurrence of an error.

You should use a datagram when you do not require a reply from the application that receives the message. An example of an application that could use datagrams is one that displays flight information on the airport screens periodically.

You should use a request message when you expect a reply from the application that receives the message. An example of an application that could use request messages is one that displays the balance of an account. The request message could contain the number of the account, and the reply message would contain the account balance. If you want to link your reply message with your request message, there are two options:.

You should use a reply message when you reply to another message. When you create a reply message, you should respect any options that were set in the message descriptor of the message to which you are replying.

Report options specify the content of the message identifier MsgId and correlation identifier CorrelId fields. These fields allow the application that receives the reply to correlate the reply with its original request. Report messages inform applications about events such as the occurrence of an error when processing a message.

They can be generated by:. Note that report messages can be generated at any time, and they may arrive on a queue when your application is not expecting them. In WebSphere MQ applications, when a program receives a message that asks it to do some work, the program usually sends one or more reply messages to the requester, mq application programming reference. To help the requester to associate these replies with its original request, an application can set a correlation identifier field in the descriptor of each message.

Programs should copy the message mq application programming reference of the request message into the correlation identifier field of their reply messages. A channel is a communication link used by queue managers. There are two categories of channel in WebSphere MQ, and we can describe them as control channels mq application programming reference data channels:.

An object of the MQQueueManager class represents a connection mq application programming reference a queue manager. It has properties corresponding to the attributes of a queue manager. Note that accessing a queue manager attribute property implicitly connects to the queue manager if not already connected.

An object of the MQQueue class represents a queue. It has methods to Put and Get messages to and from the queue. It has properties corresponding to the attributes of a queue. Note that accessing a queue attribute property, or issuing a Put or Get method call, implicitly opens the queue. An object of the MQMessage class represents a message to be placed on a queue or to be retrieved from a queue. It encapsulates both application data and MQMD, along with having properties corresponding to MQMD fields, and methods that allow you to mq application programming reference and read user data of different types for example, strings, long integers, short integers, byte.

A WebSphere MQ client is part of the WebSphere MQ product that can be installed on a separate machine from the base product and server and acts as a proxy between that machine and the server.

The MQI is available to applications running on the client platform; the queues and other WebSphere MQ objects are held on a queue manager that you have installed on a server machine. An application that you want to run in the WebSphere MQ client environment must first be linked with the relevant client library. An application running in the WebSphere MQ client environment runs in synchronous mode because there must be an active connection between the client and the server machines.

Clients and servers communicate through MQI channels. This is the case for every queue manager that an application needs to connect to. You can have an application that uses the MQI running on one machine and the queue manager running on a different machine.

The benefits of doing mq application programming reference are:. Before you become able to send and receive messages to and from MQSeries; you need to install a set of applications and do some simple configurations.

You need to install:. After installing the software you need to go and configure the MQ client. There are multiple ways of performing the configurations; the easiest and most straight forward one is by adding a system wide environment variable called MQSERVER and assigning to it the channel name, mq application programming reference, protocol used, server address and port in the following format:.

To perform this on windows-XP right-click on my mq application programming reference and select properties, then click over the Advanced tab. Under system variables, click on the New button; a screen will popup asking you to provide the variable name and its value.

Then click over the OK button. Below you will find a ready-to-use class with comments showing you how to drop and receive messages from WebSphere MQ. All what you have to do is to add a reference to IBM. WMQ namespace which exists in amqmdnet, mq application programming reference. One of the annoying things about the.

When the value of CompCode is not equal to 0 you need to go and examine the Reason property which will give you another number that you can lookup in Appendix B for a basic explanation of the code, for more details you can refer to IBM WebSphere Messages Document. This code can be used whenever a need arise to interface with WebSphere MQ from a. NET client code.

NET application. It has been tested with Windows-XP and Windows and in both cases it was working without problems. Queue Access Options. Reason Code. Open to set attributes, mq application programming reference, required if you wish to set properties.


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mq application programming reference


Oct 25,  · This book is about the IBM WebSphere MQ products, which provide application programming services that enable you to ; write applications in which the constituent programs communicate with each other using message queues.; This book introduces the concepts of messages and queues, and gives a full description of the WebSphere MQ programming; interface, including data . MQ applications.. Syncpoints in WebSphere MQ for z/OS applications.. Syncpoints in CICS Transaction Server for OS/ and CICS for MVS/ESA applications.. Syncpoints in IMS applications.. Syncpoints in z/OS batch applications. Syncpoints in CICS for AS/ applications Syncpoints in WebSphere MQ for Windows. This book introduces the concepts of messages and queues, and shows you in detail how to ; design and write applications that use the services that WebSphere MQ provides. IBM WebSphere MQ V Application Programming Guide (SC).