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TIBCO Rendezvous® 8.8.0

# TibrvMsgView

Class

## Declaration

    class com.tibco.tibrv.TibrvMsgView
      extends java.lang.Object

## Purpose

View the fields of Rendezvous messages.

## Remarks

A message view is a snapshot copy of a TIBCO Rendezvous message. All the data resides within the Java environment (not in the C environment). A view provides read-only access to field data of an inbound message.

To create a new view, see TibrvMsgView.extract().

## Efficiency

When a callback method gets 10 or more fields, then a message view is usually more efficient than accessing the fields of the C message. Extracting a message view accesses the native C message only once, instead of repeatedly (with every get call).

When a callback method gets fewer than 10 fields, then getting fields from the native C message is usually more efficient.

## Restrictions

`TibrvMsgView` and its methods are available only in the JNI preferred implementation. They are not available in the JNI backward compatibility implementation, nor in the pure Java implementation.

Method | Description
Message View Life Cycle and Properties
TibrvMsgView.extract() | Extract a snapshot view of a TIBCO Rendezvous message.
Fields
TibrvMsgView.get() | Get the value of a specified field from a message view snapshot.
Get Scalar from TibrvMsgView | Get the value of a field from a message view snapshot as a scalar value.
TibrvMsgView.getField() | Get a specified field from a snapshot message view.
TibrvMsgView.getFieldByIndex() | Get a field from a snapshot message view by an index.
TibrvMsgView.getFieldInstance() | Get a specific instance of a field from a message.
TibrvMsgView.getNumFields() | Extract the number of fields in a snapshot message view.

Inherited Methods
`java.lang.Object.equals` `java.lang.Object.getClass` `java.lang.Object.hashCode` `java.lang.Object.notify` `java.lang.Object.notifyAll` `java.lang.Object.wait`

## Using a Message View

    try {
    	TibrvMsgView view = TibrvMsgView.extract(message);
    	for (int i = 1; i <= this.fieldCount; i++) {
    		 view.get(i);
    		 ...
    	}
    } catch (final TibrvException e) {
    	e.printStackTrace();
    	System.exit(0);
    }

## See Also

Strings and Character Encodings

TibrvMsg

TibrvMsgField

Custom Datatypes

Subtopics

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