java - Consume message only once from Topic per listeners running in cluster -

-

i'm implementing domain event infrastructure, project doesn't allow messaging infra(financial services client) found alternative in hazelcast topics , executorservice,

but problem when running in cluster message shall delivered listeners going running in cluster, cluster of 2, have same listener running in 2 jvm, , message consume twice , acted upon, suppose domain event supposed perform non idempotent operation credit loyalty points, unless explicitly maintain trace of domain event acted upon , check against everytime receive event, end crediting twice, "any suggestion implementing without having write boiler plates possibly @ infralayer", or there known patter such implementation.

edit: meanwhile i'm evaluating hazelcast executorservice suggested here

the use case described can solved using hazelcast's queues instead of topics. main reason use topics if interested multiple (possibly independent) consumers same message. requirement sounds interested 1 of consumers gets message, , that's queues for, see the hazelcast documentation queues.


Comments

Post a Comment

Popular posts from this blog

Ansible - ERROR! the field 'hosts' is required but was not set -

-
i've error when launch playbook don't found why.... error! field 'hosts' required not set there main.yml : --- - hosts: hosts - vars: - elasticsearch_java_home: /usr/lib/jmv/jre-1.7.0 - elasticsearch_http_port: 8443 - tasks: - include: tasks/main.yml - handlers: - include: handlers/main.yml and /etc/ansible/hosts : [hosts] 10.23.108.182 10.23.108.183 10.23.108.184 10.23.108.185 when test ping, : [root@poste08-08-00 elasticsearch]# ansible hosts -m ping 10.23.108.183 | success => { "changed": false, "ping": "pong" } 10.23.108.182 | success => { "changed": false, "ping": "pong" } 10.23.108.185 | success => { "changed": false, "ping": "pong" } 10.23.108.184 | success => { "changed": false, "ping": "pong" } please, me :) regards, you have syntax error in playbook.
Read more

customize file_field button ruby on rails -

-
i'm trying rid of ugly button rails has default file upload. want add glyphicon <%= f.file_field :image_url, class:"glyphicon glyphicon-camera" %> this didn't work , have tried other things in different post saw on page, don't attach file. as suggested here bootstrap filestyle , can use bootstrap's filestyle style file upload buttons. step-1: add layout application.html.erb i have added bootstrap filestyle library cdn. should make sure have both jquery , boostrap loaded. <script type="text/javascript" src="https://cdn.jsdelivr.net/bootstrap.filestyle/1.1.0/js/bootstrap-filestyle.min.js"> </script> step-2: add corresponding js file: $(":file").filestyle({input: false}); step-3: image_url file field follows: <%= f.file_field :image_url,class: "filestyle", "data-input" => false %>
Read more

SoapUI on windows 10 - high DPI/4K scaling issue -

-
Image
soapui doesn't seem dpi-aware , displays small on high dpi screen (tiny text , buttons). other applications running fine (screen resolution 3840 x 2160). version : soapui 5.1.2 os : windows 10 i have tried: configure soapui run "disable display scaling on high dpi settings" - parts of soapui looking bigger , don't display (image) changing resolution changing font size (preferences > editor settings > select font...) therefore assume, soapui pretends dpi-aware, not scale itself. have same issue? this workaround until developers round making version dpi-aware. step 1: add registry key hkey_local_machine\software\microsoft\windows\currentversion\sidebyside\preferexternalmanifest (dword) 1 step 2: add manifest file 'soapui-5.2.1.exe.manifest' in same directory 'soapui-5.2.1.exe' content of manifest file: <?xml version="1.0" encoding="utf-8" standalone="yes"?> <assembly xml
Read more