Processing JMS messages in sequence one after another
This is my use case which I wan to implement in OSB.
1. I have a queue which will receive messages in huge numbers from a single sender.
2. I have a proxy which will read each message and process the message and send it out.
In step 1 , I want each message to be read sequentially and when step 2 finishes executing then I want to read the next message from the queue.
I need to give an acknowledgment to JMS that the message has finished processing and it can make the next message available to the proxy.
What is the best option to implement this use case ?.
Regards
By default Weblogic JMS Queues are FIFO. But that is true only if there is only one consumer of the queue.
In case of a clustered environment that is not true and in case of OSB even with a single managed server multiple threads are created for a JMS listener Proxy(by default 16). So there will be 16 instances of the Proxy trying to read messages from the Queue and each will be handed out a message and sequential integrity is disturbed.
There are three ways to overcome this problem:
1. Unit of Order
This is suitable only when you want messages of the same group to be processed sequentially while multiple groups can be processed in parallel.
For e.x. you are getting multiple orders for multiple customers and you want to ensure that the orders of same customer are processed sequentially (in case a customer tries to change the quantity of an order then the latest one should be processed last). In this case you can set UOO as the CustomerID and each customer's order will be processed sequentially but orders of different customers will be still processed in parallel. WLS JMS achieves this by assigning a target queue instance on the cluster for each UOO value. It will assign Q!MS1 to CustID=1, Q!MS2 to CustID=2 and so on. All messages of the same UOO(of the same customer) will go to the same instance on the queue. Furthermore it will ensure that no two messages of the same UOO are released together to the listeners. So if a queue instance has 5 messages each of both Cust=1 and Cust=2, only one message each of Cust1 and Cust2 will be processed by the listeners even if there are 16 listening threads.
Pros and Cons:
Overall performance is improved since you can still achieve some parallel processing.
There will be a slight overhead of processing the UOO headers on the JMS servers.
Can not ensure sequencing of all the messages. (Although you can achieve that by setting the same UOO on all the messages)
If the managed server assigned to a UOO is down, if a publisher tried to put the next message for that UOO, it will fail since it will not try to send that message to any other managed server.
2. Single threaded processing
If you don't want to process even different groups of messages in parallel and if you want absolute sequencing (i.e. irrespective of the CustomerID you want all the messages to be processed in the sequence they arrive) you will need to process them in a single threaded model. The JMS queue should be deployed on only one managed server of the cluster. The JMS proxy listening to the queue should also be deployed on a single managed server(You will need to change the targeting for the EJB created for this Proxy in the Deployments) and there should be a Work Manager for this Proxy with Maximum Thread Constraint set as 1. In the Connection Factory which the Proxy uses, set the Maximum Messages per session to 1. Another approach for Single threaded could be to set the same value of UOO on all of the messages. This will make all the messages to go to the same Q instance in the cluster and also will make sure that even if Proxy has multiple threads, only one message will be processed at a time.
Pros and Cons:
Completely single threaded processing, will take more time since messages will be processed one after the other.
Load balancing will go awry as all the messages will be processed by only one server.
3. Using custom implementation
The most complex way is to create a completely custom implementation. Put all the messages in a DB and then process them one at a time based on timestamp.
Pros and Cons:
It will take more effort to implement than the other two approaches.
It will again need single threaded processing after the messages are put on the DB
Performance wise there will be more impact because of additional DB calls
More complex to maintain
Based on your exact requirements you can choose which approach you want. If you have SOA suite as well them it would be better to move this solution to SOA suite as OESB(Mediator) component of SOA suite has re-sequencing feature.
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Hello,
SQL> with my_table as
2 (
3 select 'M082012' pera, to_number(10584338) snr, to_number(10) pnr, 'Beule' name, 'Anna' f_name from dual union all
4 select 'M092012' pera, to_number(15965177) snr, to_number(15) pnr, 'Tester' name, 'Toni' f_name from dual union all
5 select 'M082012' pera, to_number(14254501) snr, to_number(20) pnr, 'Wallen' name, 'Monika' f_name from dual union all
6 select 'M012013' pera, to_number(14254505) snr, to_number(15) pnr, 'Wallen' name, 'Monika' f_name from dual union all
7 select 'M012013' pera, to_number(14254506) snr, to_number(15) pnr, 'Wallen' name, 'Monika' f_name from dual union all
8 select 'M082012' pera, to_number(10584339) snr, to_number(10) pnr, 'Beule' name, 'Anna' f_name from dual union all
9 select 'M092012' pera, to_number(15965178) snr, to_number(10) pnr, 'Beule' name, 'Anna' f_name from dual union all
10 select 'M012013' pera, to_number(10674833) snr, to_number(15) pnr, 'Tester' name, 'Toni' f_name from dual union all
11 select 'M012013' pera, to_number(10674834) snr, to_number(15) pnr, 'Tester' name, 'Toni' f_name from dual union all
12 select 'M082012' pera, to_number(10674835) snr, to_number(15) pnr, 'Tester' name, 'Toni' f_name from dual union all
13 select 'M012013' pera, to_number(10539210) snr, to_number(30) pnr, 'Klose' name, 'Werner' f_name from dual union all
14 select 'M012013' pera, to_number(12345678) snr, to_number(50) pnr, 'Meier' name, 'Otto' f_name from dual union all
15 select 'M012013' pera, to_number(22345789) snr, to_number(50) pnr, 'Meier' name, 'Otto' f_name from dual union all
16 select 'M082012' pera, to_number(10584346) snr, to_number(77) pnr, 'Carl' name, 'Frank' f_name from dual union all
17 select 'M062012' pera, to_number(10550971) snr, to_number(77) pnr, 'Carl' name, 'Frank' f_name from dual union all
18 select 'M092012' pera, to_number(15965185) snr, to_number(77) pnr, 'Carl' name, 'Frank' f_name from dual union all
19 select 'M082012' pera, to_number(10584352) snr, to_number(50) pnr, 'Meier' name, 'Otto' f_name from dual union all
20 select 'M092012' pera, to_number(15965191) snr, to_number(80) pnr, 'Duster' name, 'Hucke' f_name from dual)
21 select case when pera = 'M012013' and rn3 = 1 then '*' end mark,
22 pera,
23 snr,
24 pnr,
25 name,
26 f_name,
27 case when pera = 'M012013' and rn3 = 1 then snr end mark_snr
28 from (select pera, snr, pnr, name, f_name,
29 row_number() over (partition by pera, pnr, snr, name, f_name order by pnr, name) rn,
30 row_number() over (partition by pera, name, f_name order by pnr) rn3
31 from (select pera, snr, pnr, name, f_name,
32 max(case when pera = 'M012013' then 'Y' end)
33 over(partition by upper(name||f_name)) m_flag,
34 count(*) over(partition by upper(name||f_name)) cnt
35 from my_table)
36 where m_flag = 'Y'
37 and cnt > 1
38 order by 4,5,6, to_number(substr(pera,4,4)||substr(pera,2,2)) desc)
39 order by 4,5,6, to_number(substr(pera,4,4)||substr(pera,2,2)) desc,3
40 /
M PERA SNR PNR NAME F_NAME MARK_SNR
* M012013 10674833 15 Tester Toni 10674833
M012013 10674834 15 Tester Toni
M092012 15965177 15 Tester Toni
M082012 10674835 15 Tester Toni
* M012013 14254505 15 Wallen Monika 14254505
M012013 14254506 15 Wallen Monika
M082012 14254501 20 Wallen Monika
* M012013 12345678 50 Meier Otto 12345678
M012013 22345789 50 Meier Otto
M082012 10584352 50 Meier Otto
10 Zeilen ausgewählt.
SQL>
SQL> I would like to get the SNR column values one after another in MARK_SNR Column.
It is possible to get the following output with a sql statement???
M PERA SNR PNR NAME F_NAME MARK_SNR
* M012013 10674833 15 Tester Toni 10674833, 10674834, 15965177, 10674835
* M012013 14254505 15 Wallen Monika 14254505, 14254506, 14254501
* M012013 12345678 50 Meier Otto 12345678, 22345789, 10584352Try this:
WITH my_table AS
(SELECT 'M082012' pera,
TO_NUMBER (10584338) snr,
TO_NUMBER (10) pnr,
'Beule' name,
'Anna' f_name
FROM DUAL
UNION ALL
SELECT 'M092012' pera,
TO_NUMBER (15965177) snr,
TO_NUMBER (15) pnr,
'Tester' name,
'Toni' f_name
FROM DUAL
UNION ALL
SELECT 'M082012' pera,
TO_NUMBER (14254501) snr,
TO_NUMBER (20) pnr,
'Wallen' name,
'Monika' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (14254505) snr,
TO_NUMBER (15) pnr,
'Wallen' name,
'Monika' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (14254506) snr,
TO_NUMBER (15) pnr,
'Wallen' name,
'Monika' f_name
FROM DUAL
UNION ALL
SELECT 'M082012' pera,
TO_NUMBER (10584339) snr,
TO_NUMBER (10) pnr,
'Beule' name,
'Anna' f_name
FROM DUAL
UNION ALL
SELECT 'M092012' pera,
TO_NUMBER (15965178) snr,
TO_NUMBER (10) pnr,
'Beule' name,
'Anna' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (10674833) snr,
TO_NUMBER (15) pnr,
'Tester' name,
'Toni' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (10674834) snr,
TO_NUMBER (15) pnr,
'Tester' name,
'Toni' f_name
FROM DUAL
UNION ALL
SELECT 'M082012' pera,
TO_NUMBER (10674835) snr,
TO_NUMBER (15) pnr,
'Tester' name,
'Toni' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (10539210) snr,
TO_NUMBER (30) pnr,
'Klose' name,
'Werner' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (12345678) snr,
TO_NUMBER (50) pnr,
'Meier' name,
'Otto' f_name
FROM DUAL
UNION ALL
SELECT 'M012013' pera,
TO_NUMBER (22345789) snr,
TO_NUMBER (50) pnr,
'Meier' name,
'Otto' f_name
FROM DUAL
UNION ALL
SELECT 'M082012' pera,
TO_NUMBER (10584346) snr,
TO_NUMBER (77) pnr,
'Carl' name,
'Frank' f_name
FROM DUAL
UNION ALL
SELECT 'M062012' pera,
TO_NUMBER (10550971) snr,
TO_NUMBER (77) pnr,
'Carl' name,
'Frank' f_name
FROM DUAL
UNION ALL
SELECT 'M092012' pera,
TO_NUMBER (15965185) snr,
TO_NUMBER (77) pnr,
'Carl' name,
'Frank' f_name
FROM DUAL
UNION ALL
SELECT 'M082012' pera,
TO_NUMBER (10584352) snr,
TO_NUMBER (50) pnr,
'Meier' name,
'Otto' f_name
FROM DUAL
UNION ALL
SELECT 'M092012' pera,
TO_NUMBER (15965191) snr,
TO_NUMBER (80) pnr,
'Duster' name,
'Hucke' f_name
FROM DUAL),
t AS
( SELECT CASE WHEN pera = 'M012013' AND rn3 = 1 THEN '*' END mark,
pera,
snr,
pnr,
name,
f_name,
CASE WHEN pera = 'M012013' AND rn3 = 1 THEN snr END mark_snr
FROM ( SELECT pera,
snr,
pnr,
name,
f_name,
ROW_NUMBER ()
OVER (PARTITION BY pera, pnr, snr, name, f_name
ORDER BY pnr, name)
rn,
ROW_NUMBER ()
OVER (PARTITION BY pera, name, f_name ORDER BY pnr)
rn3
FROM (SELECT pera,
snr,
pnr,
name,
f_name,
MAX (CASE WHEN pera = 'M012013' THEN 'Y' END)
OVER (PARTITION BY UPPER (name || f_name))
m_flag,
COUNT (*)
OVER (PARTITION BY UPPER (name || f_name))
cnt
FROM my_table)
WHERE m_flag = 'Y' AND cnt > 1
ORDER BY 4,
5,
6,
TO_NUMBER (
SUBSTR (pera, 4, 4) || SUBSTR (pera, 2, 2)) DESC)
ORDER BY 4,
5,
6,
TO_NUMBER (SUBSTR (pera, 4, 4) || SUBSTR (pera, 2, 2)) DESC,
3)
SELECT *
FROM (SELECT MARK,
PERA,
SNR,
PNR,
NAME,
a.F_NAME,
CASE
WHEN mark = '*' THEN
MARK_SNR
|| ','
|| SUBSTR (b.str, INSTR (b.str, ',', 1) + 1)
END
mark_snr
FROM t a,
( SELECT f_name,
listagg (SNR, ',') WITHIN GROUP (ORDER BY pera) str
FROM t
GROUP BY f_name) b
WHERE a.f_name = b.f_name)
WHERE mark_snr IS NOT NULL;OUTPUT:
MARK PERA SNR PNR NAME F_NAME MARK_SNR
* M012013 10674833 15 Tester Toni 10674833,10674834,10674835,15965177
* M012013 14254505 15 Wallen Monika 14254505,14254506,14254501
* M012013 12345678 50 Meier Otto 12345678,22345789,10584352Cheers,
Manik. -
I know this is possible, I'm not sure how to go about it using Oracle's Scheduler. I simply want to create a special "queue" that I can submit jobs to which will run one after another. After they run, then then are gone. There many be no jobs at anyone time, and then at other times I may submit 10 jobs to the queue. Currently when I submit jobs they all run parrallel, this is not what I want. I guess I don't understand why Oracle calls it a Job Queue when all my jobs run in parrallel and not in a queue as the name implies.
This is not say that I don't have other jobs which I would not want to send to this "queue". In other cases I would just want to submit the job and let it run right away and not wait on anything.
I'm currently using the DBMS_JOB package, which I'm pretty sure won't let me do what I want.
Any help would be greatly appreciated.
Thanks,
JoeHere is and example that creates Resource Manager objects and
two job classes that will permit 1 and 3 jobs to
run in parallel. Note this will work in 11R1 and 10.2.4
Assumes user user scott/tiger exists.
-- Remove existing scheduler objects, jobs and classes
CONNECT / as sysdba
BEGIN
DBMS_SCHEDULER.DROP_JOB_CLASS(
JOB_CLASS_NAME => 'JOBQ_WIDTH_1_CLASS'
END;
BEGIN
DBMS_SCHEDULER.DROP_JOB_CLASS(
JOB_CLASS_NAME => 'JOBQ_WIDTH_3_CLASS'
END;
BEGIN
FOR I IN 1..30 LOOP
BEGIN
SYS.DBMS_SCHEDULER.DROP_JOB(JOB_NAME => 'SCOTT.SERIAL_' || I, FORCE=>TRUE);
EXCEPTION WHEN OTHERS THEN NULL;
END;
END LOOP;
END;
BEGIN
FOR I IN 1..90 LOOP
BEGIN
SYS.DBMS_SCHEDULER.DROP_JOB(JOB_NAME => 'SCOTT.PAR3_' || I, FORCE=>TRUE);
EXCEPTION WHEN OTHERS THEN NULL;
END;
END LOOP;
END;
ALTER SYSTEM SET RESOURCE_MANAGER_PLAN='';
set echo on
-- Remove previously defined resource plan, resource plan
-- directives, and resource consumer groups for this test
BEGIN
-- Prepare the pending area
DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA;
-- Delete resource plan, its resource plan directives, and
-- any associated resource groups
DBMS_RESOURCE_MANAGER.DELETE_PLAN_CASCADE(
plan => 'JOBQS_PLAN'
-- Submit the changes
DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA;
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;
END;
-- Create resource manager objects
BEGIN
DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA();
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.CREATE_CONSUMER_GROUP (
CONSUMER_GROUP => 'JOBQ_WIDTH_1_GROUP',
COMMENT => 'Consumer group to force jobs to execute in serial'
DBMS_RESOURCE_MANAGER.CREATE_CONSUMER_GROUP (
CONSUMER_GROUP => 'JOBQ_WIDTH_3_GROUP',
COMMENT => 'Consumer group to allow jobs to run in parallel 3'
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA();
END;
BEGIN
DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA();
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.CREATE_PLAN
('JOBQS_PLAN', 'PLAN TO SUPPORT JOBQS');
DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE(
PLAN => 'JOBQS_PLAN',
GROUP_OR_SUBPLAN => 'JOBQ_WIDTH_1_GROUP',
COMMENT=>'Associates with job class JOBQ_WIDTH_1_CLASS',
CPU_P1 => 25,
PARALLEL_DEGREE_LIMIT_P1 => 1,
ACTIVE_SESS_POOL_P1 =>1
DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE(
PLAN => 'JOBQS_PLAN',
GROUP_OR_SUBPLAN => 'JOBQ_WIDTH_3_GROUP',
COMMENT=>'Associates with job class JOBQ_WIDTH_3_CLASS',
CPU_P1 => 75,
PARALLEL_DEGREE_LIMIT_P1 => 2,
ACTIVE_SESS_POOL_P1 =>3
DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE(
PLAN => 'JOBQS_PLAN',
GROUP_OR_SUBPLAN => 'OTHER_GROUPS',
CPU_P1 => 0,
CPU_P2 => 100,
COMMENT=>'Required'
DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA();
END;
-- Create scheduler classes
BEGIN
DBMS_SCHEDULER.CREATE_JOB_CLASS(
JOB_CLASS_NAME => 'JOBQ_WIDTH_1_CLASS',
LOGGING_LEVEL => DBMS_SCHEDULER.LOGGING_FULL,
LOG_HISTORY => 5,
RESOURCE_CONSUMER_GROUP => 'JOBQ_WIDTH_1_GROUP',
COMMENTS => 'Force jobs to run in serial, through plan JOBQ_PLAN and group JOBQ_WIDTH_1_GROUP'
END;
BEGIN
DBMS_SCHEDULER.CREATE_JOB_CLASS(
JOB_CLASS_NAME => 'JOBQ_WIDTH_3_CLASS',
LOGGING_LEVEL => DBMS_SCHEDULER.LOGGING_FULL,
LOG_HISTORY => 5,
RESOURCE_CONSUMER_GROUP => 'JOBQ_WIDTH_3_GROUP',
COMMENTS => 'Allow up to 3 jobs in parallel, enforced by plan JOBQ_PLAN and group JOBQ_WIDTH_3_GROUP'
END;
connect / as sysdba
grant execute on jobq_width_1_class to scott;
grant execute on jobq_width_3_class to scott;
begin
dbms_resource_manager_privs.grant_switch_consumer_group('scott','JOBQ_WIDTH_1_GROUP',false);
dbms_resource_manager_privs.grant_switch_consumer_group('scott','JOBQ_WIDTH_3_GROUP',false);
end;
alter system set resource_manager_plan='';
connect scott/tiger
begin
for i in 1..30 loop
sys.dbms_scheduler.create_job(job_name => 'scott.serial_' || i,
job_type=>'plsql_block', job_action=>'dbms_lock.sleep(2);',
job_class=>'jobq_width_1_class',
enabled=>true);
end loop;
end;
begin
for i in 1..90 loop
sys.dbms_scheduler.create_job(job_name => 'scott.par3_' || i,
job_type=>'plsql_block', job_action=>'dbms_lock.sleep(2);',
job_class=>'jobq_width_3_class',
enabled=>true);
end loop;
end;
/-- The par3_90 job should finish about the same time as the serial_30 job since
-- we run 3 jobs in paralled and serial respectively.
-- check user_scheduler_job_run_details for after the test completed to verify. -
Invoking 2 SQL statements one after another?
Hi,
Is it a good idea to invoke to 2 SQL statements one after another using the same connection & statement object? Some thing like this:-
method(){
String insertSql="insert into employee(Name,Age)values(?,?);
Connection conn=null;
PreparedStatement pst=null;
int insertRows=0;
ResultSet rs=null;
try{
conn=getConnection(); //will get the connection object
if(insertRows==0){
pst=conn.preparedStatement(insertSql);
pst.setString(1,"Jason");
pst.setString(2,"30");
insertRows=pst.executeUpdate();
conn.commit();
if(insertRows>0) {
pst=conn.createStatement("select * from employee");
//retrieving the data from the same table
rs=pst.executeQuery();
while(rs.next()){
System.out.println("The name is::"+rs.getString(1)+ " "+rs.getString(2));
}catch(Exception e){
}finally{
try{
if(pst != null) {
pst.close();
pst = null;
if(rs != null) {
rs.close();
rs = null;
if(conn != null) {
conn.close();
conn = null;
}catch(Exception e) {
e.printStackTrace();
Here one more thing is that i want the insertSQL statement to be invoked only once that is in the beginning and the next time the method() is called it should skip the insert block and should only retrieve the data using "select * from employee". How to do it? I tried with few options nothing works.. Please do provide a solution for this... It is really urgent.
ThanksIs it a good idea to invoke to 2 SQL statements one after another using the same connection & statement object? I think what you're asking is if you need a new Connection and/or Statement object for every query. The answer is no. In fact, most applications pool Connections so literally thousands or millions of queries are done in the lifetime of a Connection. You can reuse Statements and PreparedStatements as well as long as you intend on executing the same query.
-
Songs Skip Forward One After Another/Sporadic and Out of Nowhere
I have an older IPOD 40g that skips through songs, one after another, without playing anything, and seems to do it in any mode, especially in overall Shuffle mode. I have the "shuffle Songs" feature on, but other than that, it has a pretty standard set up.
I have restored to the defaults, last week, and it started doing the wierd stuff again today.
Sometimes I have a hard time getting it to unfreeze and reset as well.
I appreciate any help.Have you tried Party Shuffle? If you control click on a track, you can choose "Play Next In Party Shuffle". I often listen the way you're describing. I start listening in Party Shuffle (which I have set to select from a specific playlist). When I am reminded of another song, I select the song and then choose Play Next in Party Shuffle. And so on.
As for your second question, you could try moving your entire short playlist into Party Shuffle. Once that playlist was done, Party Shuffle would revert to it's normal selection criteria (you could set it to pull from your entire library or a specific playlist). Music would keep playing.
Can you tell I like Party Shuffle? -
I want to be able to go to a tag section and view the photos one after another. Using Adobe 9 pre and pse.
Hi,
I did not completely understand your workflow. Can you please elaborate a bit more?
Thanks
Andaleeb
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