• Websphere mq get message options

    Websphere mq get message options

    When enterprise applications running inside of WebSphere Application Server put messages to a protected queue, the queue manager will encrypt them before putting them onto the queue.

    websphere mq get message options

    If an enterprise application gets messages from a protected queue, then the queue manager will decrypt it before returning it to the application. If your application server is located on a different system to the queue manager, and is connecting to it using the CLIENT transport, then you have three options:.

    This version of the application server embeds the IBM MQ V9 resource adapter, which contains the code needed to encrypt and decrypt messages that are put to, and received from, protected queues. When an enterprise application running inside of the application server puts a message to a protected queue, then the IBM MQ resource adapter encrypts the message before sending it over to the queue manager. The queue manager will then store the encrypted message on the target queue.

    Figure 1: Messages are encrypted by the MQ resource adapter before being sent to the queue manager. Similarly, when an enterprise application gets a message from a protected queue, the queue manager will send the encrypted message to the application server. The IBM MQ resource adapter will decrypt the message and then pass the unencrypted message to the application for processing.

    Figure 2: The queue manager sends encrypted messages to the IBM MQ resource adapter, which decrypts it before giving it to the application. When MCA AMS interception is enabled on a channel, then if an enterprise application connects to a queue manager using that channel and puts a message to a protected queue, the message data will be unencrypted when it flows over the channel. The MCA will then encrypt the data before putting the message to the queue.

    If an enterprise application connects to the queue manager over the channel and gets a message from a protected queue, the MCA will decrypt the message data. The MCA will then pass the decrypted message to the WebSphere MQ resource adapter embedded within the application server, which hands the message off to the application for processing. One thing to be aware of here is that encryption and decryption are heavyweight operations, and CPU intensive.

    If there are lots of enterprise applications putting to, and getting from, protected queues, there will be a significant load on the queue manager system. When the enterprise application is putting messages to the protected queue, it connects to the intermediate queue manager and sends the unencrypted message.

    The target queue manager then puts the encrypted message onto the protected queue.

    websphere mq get message options

    The local queue needs to be protected. These protected messages are forwarded to the protected queue on the intermediate queue manager. When enterprise applications get messages from the local queue, the MCA will decrypt the message before passing it to the WebSphere MQ resource adapter embedded in the application server. Finally, the WebSphere MQ resource adapter hands the message off to the enterprise application for processing.

    Figure 6: An application puts the encrypted messages to a remote queue, where they are forwarded to the protected queue. The enterprise application then gets the messages from the protected queue, using the MCA to do the decryption. As with option 2 above, there are a few things that you should be aware of when adopting this approach. It should be possible to use that to determine the cause of the issue.

    In case of AMS, the activity logs will also contain message in encrypted format. In case of any issue such as message loss or put request failure on this queue how would we investigate and reconcile the message sent by external application and one received in mq queue. Skip to main content Press Enter.

    websphere mq get message options

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    Sending and Receiving IBM WebSphere MQ Messages

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    Document Information. UID swg Contact and feedback Need support?The following example disconnects the Base SAS session from a queue manager identified by the parameter hConn. If data accompanies the message, it is retrieved into an internal Base SAS buffer.

    Not all attributes are valid for each type of object queue, process definition, or queue manager. Valid object types are listed under each attribute. For queues that are monitored by the object spawner, the MsgDeliverySequence property must be set to Priority. The example then queries the name of the temporary dynamic queue that was created after a successful OPEN.

    Therefore, the parameters and values serve as both input and as output to the function. This example sends a message to a queue, and then queries and displays the message descriptor values. This property is optional so that by default data is not aligned data starts at next available position in message.

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    This property is optional in most cases. The only time length is required is when setting up to receive character data. Specifying length for numeric data is ignored since length is implicitly defined. That is, if the data that you are sending or receiving is of a different type than the Base SAS variable itself, the data will be coerced into the appropriate data type.

    This example defines a map to use to send and receive a message with a short, a long, a double and a character string. No alignment is specified for any data type, and strings will always be characters in length blank padded.

    Creates a data descriptor that describes the actual Base SAS variables along with an associated data mapping.

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    Creates or manipulates a reference message header so that an application can put a message in this format, omitting the bulk data. When the reference message header is read from the transmission queue by a message channel agent MCAa user-supplied message exit is invoked to process the reference message. A sample message exit is supplied by WebSphere MQ, amqsxrm. You will need to add this message exit to the sending and receiving channel definitions.

    The message exit on the sending side can append to the reference message the bulk data identified by the reference message header before the MCA sends the message through the channel to the next queue manager. When a reference message is received, the receiving message exit should create the object from the bulk data that is associated with the reference message header, and then pass on the reference message without the bulk data so that the reference message without the bulk data can later be retrieved by a program.

    This example goes through the process of connecting to a queue manager, preparing the queue, generating the message, closing the queue, and freeing all resources.

    SAS 9. Prev Next Contents. This parameter can be used to determine if an error occurred during the execution of this routine. If an error occurred, the compCode parameter will be non-zero, and the reason parameter will be set to the appropriate reason code.

    If an error occurred, compCode will be non-zero, and the reason parameter will be set to the appropriate reason code. Example The following example disconnects the Base SAS session from a queue manager identified by the parameter hConn.

    SET Open to set object attributes. Example This example opens a queue for input and output. Example This example closes a queue.

    If set to zero, it is assumed that no data will accompany this message. Example This example sends a message to a queue. Note that the queue does not have to be open prior to making this call.

    Also note that the queue will be closed during the execution of this call.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

    Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I've run into a frustrating problem browsing a queue all the way through its depth. The problem is, my attempts worked only to retrieve the first message!

    This was frustrating, but I was able to rely upon questions and answers posted here on SO to verify that I was on the right path. Unfortunately, none of the answers addressed subsequent GETs with browse, and I was stumped. The answer came to me after trying a number of fruitless other paths, and it was very simple when I finally came to it. I modified the code above by adding the needed line of code just before the GET in the while loop:.

    Yes, that's correct.

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    A new instance of MQMessage is required for every Get method call. For example the MessageId property gets initialized with message id of the message. If the same object is used again to get another messages, the Get actually attempts to get a message that has MessageID of the message retrieved before.

    WebSphere MQ Get

    For simple C programs, creating a new MQMessage object is fine but for long running programs that will deal with thousands or millions of messages, this is NOT a good approach. It is far better to reuse the object. Learn more. Ask Question. Asked 6 years, 8 months ago. Active 6 years, 8 months ago. Viewed 8k times. ReadString msg. MessageLength ; Messages. Cyberherbalist Cyberherbalist Active Oldest Votes. Thanks for coming back and answering your own question.

    This is great! I know it's old, but this helped me a bunch! One tip for fellow readers: you don't have to start with First. If you just opened the queue, you can just use Next right away.

    Technical Introduction to IBM WebSphere MQ

    Only when you reuse an already opened queue and want to start over, you need First. Shashi Shashi That is definitely a useful addition to the question. Roger Roger 5, 8 8 silver badges 15 15 bronze badges.

    Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.Previous Page Next Page. The applications do not have to be running at the same time or even in the same operating environment. An application can communicate with another application by sending a message to a queue.

    The receiving application retrieves the message when it is ready. Establishes a connection to a WebSphere MQ queue manager.

    The queue manager is responsible for maintaining the queues and for ensuring that the messages in the queues reach their destination. This insulates the application developer from the details of the network. When a successful connection is made, the queue manager issues a connection handle that is used to identify the connection in subsequent function calls. Note: A program can have connections to more than one queue manager if the platform supports multiple queue managers running on it.

    Opens the desired queue. When opening a queue, the program must define how it intends to use it. For example, the program can send put messages to the queue, receive get messages from the queue, or it can do both. Similarly, if the queue is opened using the SET option, then various queue attributes can be set.

    How to put Message on to Queue in WebSphere MQ

    If the queue is opened successfully, then the queue manager issues an object handle that is used to identify the queue in subsequent function calls. The queue is identified using the connection handle for the queue manager and the object handle for the queue. In addition, several other functions are available for creating and manipulating the data in the message as well as setting options that help the receiving program locate the message in the queue.

    Optional Opens the same queue or a different one for retrieving messages.

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    The program uses the MQGET routine specifying the connection handle to the queue manager and the object handle for the queue from which it wants to retrieve the message. There are a number of options that can be set to help identify the message to get from the queue. Optional Releases the resources allocated by a SAS internal handle.It cannot get a message from a queue on another system.

    To identify the message that you want to get from a queue, use the message descriptor structure MQMD. If you know which message you want to get from the queue, see Getting a particular message. However, if you want to group your messages, the GroupId must be the same for messages in the same group, so that the call looks for a message having the same identifiers as the previous message in order to make up the whole group.

    The following sections help you to complete some of the fields of this structure. For more information about these options, see Waiting for messages. In WebSphere MQ on all other platforms, the Signal1 field is reserved and its value is not significant.

    MsgToken uniquely identifies a message. If your program is serving a queue that is also being served by other programs, one of those other programs might remove the message that you want before your program can issue another MQGET call. Your program could waste time searching for a message that no longer exists. This positions the browse cursor under the message that you want.

    If another program removes the message between your browse and removal calls, your second MQGET fails immediately without searching the whole queuebecause there is no message under your browse cursor.

    Try to make the buffer size as close as possible to the actual message size to avoid reduced performance. For further information about the MaxMsgLength attribute, see Increasing the maximum message length.

    A queue handle. A description of the message that you want to get from the queue. This is in the form of a message descriptor MQMD structure.

    The address of the storage in which to put the message. The output from MQGET is: A reason code A completion code The message in the buffer area that you specified, if the call completes successfully Your options structure, modified to show the name of the queue from which the message was retrieved Your message descriptor structure, with the contents of the fields modified to describe the message that was retrieved The length of the message MQLONG.

    Note: If you want to use MQGET more than once for example, to step through the messages in the queueyou must set the MsgId and CorrelId fields of this structure to null after each call. This clears these fields of the identifiers of the message that was retrieved. StrucId StrucId is a 4-character field used to identify the structure as a get-message options structure. Version Version describes the version number of the structure. Options Within your code, you can select the options in any order; each option is represented by a bit in the Options field.This website uses cookies to help us give you the best experience when you visit.

    To find out more, please review our Privacy Policy. These classes use a dynamic-link library that is automatically installed by InterSystems IRIS on all suitable platforms. This is MQInterface. Creating a Connection Object. Specifying Other Message Options.

    Sending Messages. Retrieving Messages. Updating Message Information. Note that the installer updates the PATH environment variable and adds other system variables as needed. Make sure that you have rebooted the machine after installing the client, so that InterSystems IRIS is aware of the client. The username under which you will access the server must have permission to use the queue managers and the queues that you plan to use.

    MQRecvdepending on whether you are going to send or receive messages. When you do so, you provide the following information:. The channel by which to communicate with that queue. MQRecv to send or receive messages. MQRecv return either 1 if successful or 0 if unsuccessful.

    For information on the reason codes, see the formal IBM documentation. Before you can send or receive messages via IBM WebSphere MQ, you must create a connection objectan object that establishes a connection to a queue manager, opens a channel, and opens a queue for use. There are two ways you can do this:.

    Getting messages from a queue using the MQGET call

    MQRecv if you are going to receive messages. This topic refers to this instance as the connection object.

    websphere mq get message options

    If authentication is required, set the following properties of the connection object:. Username — Specifies the username who has permission to use this channel. Password — Specifies the password for the given user. This method takes the following arguments, in order.

    Required A string that specifies the queue name; this should be a valid queue for the specified queue manager. Or, if IBM WebSphere MQ has been the configured so that the queue manager is determined by the queue name, the system uses the queue manager that is appropriate for the given queue name.

    Transport can be one of the following: TCP.


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