6.6.4. Last Value Queue Command-line Example

The included programs drain and spout can be used for sending and receiving messages for testing purposes. The source code for the two utilities is included in the Python and C++ client library packages. The Python version can be run uncompiled using a Python interpreter.

Run the following qpid-config command to create a Last Value Queue:

qpid-config add queue my-queue --argument qpid.last_value_queue_key=type

qpid-config add queue my-queue --argument qpid.last_value_queue_key=type

Copy to Clipboard

Toggle word wrap

The header key 'type' is used to match messages in the queue.

Now start one or more browsers using the drain command:

./drain -f -c 0 'my-queue; {mode: browse}'

./drain -f -c 0 'my-queue; {mode: browse}'

Copy to Clipboard

Toggle word wrap

These browsers will see all the messages as they arrive in the queue in real-time.

Now use spout to send messages to the queue, setting a header value for the key 'type':

./spout -P type=a my-queue a1 
./spout -P type=a my-queue a2 
./spout -P type=a my-queue a3 
./spout -P type=b my-queue b1 
./spout -P type=c my-queue c1 
./spout -P type=c my-queue c2 
./spout -P type=a my-queue a4

./spout -P type=a my-queue a1 
./spout -P type=a my-queue a2 
./spout -P type=a my-queue a3 
./spout -P type=b my-queue b1 
./spout -P type=c my-queue c1 
./spout -P type=c my-queue c2 
./spout -P type=a my-queue a4

Copy to Clipboard

Toggle word wrap

The browsers started before these messages were published will see all messages as they arrive.

Now start a new browser:

./drain -c 0 'my-queue; {mode: browse}'

./drain -c 0 'my-queue; {mode: browse}'

Copy to Clipboard

Toggle word wrap

This browser will see only the last messages for each of the unique 'type' values.

Report a bug

返回顶部

此内容没有您所选择的语言版本。

6.6.4. Last Value Queue Command-line Example

学习

尝试、购买和销售

社区

关于红帽文档

让开源更具包容性

關於紅帽

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links