java - How guaranteed delivery works in JMS client acknowledgment mode? -


in jms (v1.0) subscriber client ack mode, message.acknowledge() way send ack server(broker) side. actual behaviour if client ack message3 message sender(broker) client acks messages message3[1].

i.e msg1, msg2, msg3 delivered client in order.

  1. client process messages ack every message, msg1, msg2 , msg3. >> ok
  2. knowing actual behaviour client acks batches(batch size=3), asks msg3 > ok (all messages upto msg3 acked)

in scenario 1 , 2, broker notified client ack 3 messages delivered. , client process 3 , ack back.

consider following scenario :

a. msg1 comes client.

b. failed process msg1. avoid ack back. (msg1 never processed or acked client side)

c. msg2 comes , processed. , ack msg2.

therefore in above scenario client ack not guarantee delivery of msg1.

please explain there workaround guaranteed delivery when batch process client ack through jms 1.0 spec.

[1] http://docs.oracle.com/javaee/7/api/javax/jms/message.html#acknowledge

according spec:

by invoking acknowledge on consumed message, client acknowledges messages consumed session message delivered to.

so, deal not acknowledge more messages in session message has failed.

instead, if detect failure, either:

  1. tear down session (or connection).

  2. invoke recover on session. restart message delivery oldest unacknowledged message.


Comments

Post a Comment

Popular posts from this blog

routing - AngularJS State management ->load multiple states in one page -

Image
i developing site in angularjs ui-router. have situation on button click need change , load 3 state page , 3 looks image .please me how can load multiple pages. in 1 page you need configure router config this: $stateprovider .state("state1", { url: "/url1", controller: "firstcontroller", views: { view1: { templateurl: "templates/template1.html" }, view2: { templateurl: "templates/template2.html" }, view3: { templateurl: "templates/template3.html" } } }).state("state2", { url: "/url2", controller: "secondcontroller", views: { view1: { templateurl: "templates/template4.html" }, view2: { templateurl: "templates/template5.html" }, view3: { templateurl: "templates/template6.html" } }).state("state3", { ...
Read more

python - GRASS parser() error -

i'm trying use grass on python 2.7, i'm having problems @ setting script on idle, i'm getting error @ parser() function: here script: import os import sys gisbase = os.environ['gisbase'] = 'c:\program files (x86)\grass gis 7.0.1rc1' gisrc = 'c:\grassdata' gisdbase = 'c:\grassdata' location = 'newlocation' mapset = 'tc' ld_library_path = 'c:\program files (x86)\grass gis 7.0.1rc1\lib' path = 'c:\program files (x86)\grass gis 7.0.1rc1\etc';'c:\program files (x86)\grass gis 7.0.1rc1\etc\python';'c:\program files (x86)\grass gis 7.0.1rc1\lib';'c:\program files (x86)\grass gis 7.0.1rc1\bin';'c:\python27';'c:\program files (x86)\grass gis 7.0.1rc1\python27';'c:\program files (x86)\grass gis 7.0.1rc1\msys' pythonlib = 'c:\python27' pythonpath = 'c:\program files (x86)\grass gis 7.0.1rc1\etc\python' sys.path.append(os.path.join(os.environ['...
Read more

Swift game error message -

i following ios game tutorial. cannot figure out wrong here. error on these 2 lines. let newangle = percent * 180 - 180 cannon.zrotation = cgfloat(newangle) * cgfloat(m_pi); 180.0 //error "use of unresolved identifier 'percent'" the tutorial uses: cannon.zrotation = cgfloat(newangle) * cgfloat(m_pi)/ 180.0 but changed error suggested import spritekit class gamescene: skscene { var cannon: skspritenode! var touchlocation:cgpoint = cgpointzero override func didmovetoview(view: skview) { /* setup scene here */ cannon = self.childnodewithname("cannon") as! skspritenode } override func touchesbegan(touches: set<uitouch>, withevent event: uievent?) { /* called when touch begins */ touchlocation = touches.first!.locationinnode(self) } override func touchesmoved(touches: set<uitouch>, withevent event: uievent?) { touchlocation = touches.first!.locationinn...
Read more