Service object creation

I was asked to create rules with the following TCP ports: 41000, 41002, 41025. Since these ports did not exists, I just created new TCP service objects. The issue is I put the those ports as source port/range and destination port/range in the Add Service Object box.
I feel like I already know the question before I ask it, but should I have used "default (1 - 65535)" in the source port/range field just like the other TCP ports?
I've attached a snapshot of the Add Service Object box.
Thanks in advance!
Regards,
The Rookie

Hi,
Personally I never configure any ACL rules or NAT configuration on the ASDM
I assume that you are trying to configure an "object service" to the destination ports that you are going to allow in some ACL?
If this is correct then I would assume that you just define the destination port section of the "object service" configuration and leave the source section blank as we dont want to define the source port range.
The "object service" lets your define both the source and destination port under the same "object service" but I dont find it that usefull.
I usually configure all the ports I need either inside "object-group service" or "object service" and only define the destination port as that is usually the one we are more interested about.
Hope this helps
- Jouni

Similar Messages

FIM MA Export errors. There is an error executing a web service object creation.

While checking for the permission, we have figured that the Built-In Synchronization account is being deleted by an Expiration Workflow.
FIM MA Export errors. There is an error executing a web service object creation.
While checking for the permission, we have figured that the Built-in Synchronization account was deleted by an Expiration Workflow
Is there a way to restore. Thanks.

I would re-run FIM setup - I think it can re-create this account
If you found my post helpful, please give it a Helpful vote. If it answered your question, remember to mark it as an Answer.

Wsdl file to service object creation

Hi Experts,
Is it possible to regenerate the Service objects from the wsdl file?
Actually, in XI we have to pass the MessageInterface, Business Service and Communication Channel to create the WSDL file from Integration Directory. My question is Vice versa, is it possible?
Regards
Sara

Hi,
Not so sure but given you have xsd and wsdl you can generate DT and MI.
Intresting queryyyyyyyyyyyyyy
<b>Cheers,
*RAJ*
*REWARD POINTS IF FOUND USEFULL*</b>

Service Order Creation through IC Web client

Hello Experts,
I am facing some problem for service order creation in IC Web client.
Description: "ISUSRV" is the new BOL component in CRM 7.0 for service order creation in ISU System. BOL Object is given in this component is "IsuserviceOrder" for service order creation.
Through this component in BOL i am able to search service order.
Problem: When i am trying to create new Service Order it gives error Massage creation failed.
(1) How to create service order through this BOL Root Object "IsuServiceOrder" which field are required to fill the data before create order.
(2) I found ORDER_CODE field in BOL Root Object "IsuServiceOrderu201D when trying to create order what value fill in this field.
(3) I have create one view Using BOL Root Object "IsuServiceOrder" with Save button how to save the service order through this button. What code is required for Save the View data?

Hi Gagan
Could you please share with your solution, i am kind looking help in same are. We are using CRM 7.0, but i can not find BOL component which is ISUSRV.
My requirement is to create Service Order from Webclient, example meter problem reporting, etc
Please kindly reply or by email shankar no dot vangari at gmail com
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shankar

ITS iviews and services objects

Dear all,
I have a problem with an ITS iview : transaction ME23N
We have implemented the archive link to attach some numerical document on SAP object.
When I go directly in ME23N in SAPgui, I can click on Services objects button, then Store business document, then I choose a document type. A frontend windows is opened to allow us to select a local file on my computer and archive it.
When I jump in ME23N through the iview portal, I can click on Services objects then Store business document, but then I can see the document type but I can't select it.
Can someone help me please ? is it possible to use this functionnality and how ?
Thanks
Kind regards
Véronique

Eliz,
iviews are Portal content objects in portal where as Services are maintained in the backend system.
services are used in HomePage Framework .basically service holds a resource that points to a PCD location in portal.By using this we can reorgananise the ESS and MSS in portal
check this blog
Rapid Portal Content Creation using the Homepage Framework
go to SPRO-cross application components - HomePage framework --- Headers,Services etc
Thanks
Bala Duvvuri

Credit block should not prevent service order creation

An upgrade from 4.7 to ECC6, without any changes made to the configuration or program change, has lead to the following issue. ECC6 is not creating a service order connected to a sales order, when the customer has exceeded the credit limit. The sales order of custom order type is getting saved with a warning message that credit limit has exceeded. However, earlier in 4.7, the message would not stop creating subsequent service order. What could be different, that prevent ECC6 environment to hold on to service order creation? A subsequent release of the credit block through VKM1 however triggers the service order being created.

Are you using credit card processing in SAP to get the authorization?
If you are then the authorization should not block the order.
Or are you using credit card as a form of payment (without authorization) in which case this needs to be put on the customers account as a payment and then the order entered.
Where are you holding the credit card details?

How to show object creation in UML

How to show object creation in UML

In a sequence diagram, it's a line (with arrow) pointing to the new object and the <creates> or <new> tag as mentioned above.
| obj 1 |
     |
     |    <creates>     ----------
     | --------------> | obj 2 |
     |                  ----------or----------
| obj 1 |
     |
     |      <new>       ----------
     | --------------> | obj 2 |
     |                  ----------

Xdb_installation_trigger does not support object creation of type SNAPSHOT

hi everyone, i'm using Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit on solaris sparc 5.10
we like to send an email through SSL, and after searching here and there I found out that oracle DB 11g able to go throught the SSL.
since upgrade our DB to 11g would not be an option, so i tried to export XDB of 11g and import it into XDB 10gR2 schema, it was a mess...
then i just reinstall XDB using catnoqm.sql & catqm.sql
and now one of our programmer cant run some script like above
CREATE MATERIALIZED VIEW FIFSYS_MKT_SCHEME_MV_COY
TABLESPACE MARKETING_TABLES
PCTUSED    40
PCTFREE    10
INITRANS   2
MAXTRANS   255
STORAGE    (
INITIAL          64K
MINEXTENTS       1
MAXEXTENTS       UNLIMITED
PCTINCREASE      0
FREELISTS        1
FREELIST GROUPS 1
BUFFER_POOL      DEFAULT
+)+
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
BUILD IMMEDIATE
REFRESH FORCE ON DEMAND
WITH PRIMARY KEY
AS
+/* Formatted on 9/23/2010 1:07:42 PM (QP5 v5.114.809.3010) */+
SELECT   coy_id,
appl_branch_id,
appl_object_code,
product_type,
ppdcf_paid_date,
SUM (scheme_adm) scheme_adm,
SUM (appl_unit) appl_unit,
SYSDATE mkt_sysdate
FROM   (SELECT   NVL (a.coy_id, '01') coy_id,
a.branch_id appl_branch_id,
DECODE (a.buss_unit, 'NMC', '2101', 'UMC', '2102', '2352')
appl_object_code,
a.platform product_type,
TRUNC (c.contract_active_date) ppdcf_paid_date,
NVL (s.ms_amt, 0) scheme_adm,
NVL (o.total_item, 0) appl_unit
FROM   ordmgmt.om_trn_appl_ms_lvl_object s,
ordmgmt.om_trn_appl_hdr a,
acctmgmt.ar_trn_sum_contracts c,
+( SELECT appl_no, COUNT ( * ) total_item+
FROM   ordmgmt.om_trn_appl_object
GROUP BY   appl_no) o
WHERE       s.appl_no = a.appl_no
AND a.appl_no = o.appl_no
AND s.ms_code IN ('MS03', 'MS14')
AND c.appl_no = a.appl_no
AND c.contract_no = a.contract_no
+/*AND c.office_code = a.branch_id*/+
AND NVL (a.coy_id, '01') = NVL (c.coy_id, '01'))
GROUP BY   coy_id,
appl_branch_id,
appl_object_code,
product_type,
ppdcf_paid_date;
COMMENT ON MATERIALIZED VIEW FIFSYS_MKT_SCHEME_MV_COY IS 'snapshot table for snapshot MARKETING.FIFSYS_MKT_SCHEME_MV_COY';
and this error shown:
ORA-00604 error occurred at recursive SQL level 1
ORA-20000 Trigger xdb_installation_trigger does not support object creation of type SNAPSHOT
ORA-06512 at line 32
maybe some of you know how to solve this problem??
and, this in the script of the xdb_installation_trigger
DROP TRIGGER SYS.XDB_INSTALLATION_TRIGGER;
CREATE OR REPLACE TRIGGER SYS.xdb_installation_trigger
BEFORE
CREATE ON DATABASE
DECLARE
sql_text varchar2(200);
val number;
BEGIN
if (dictionary_obj_owner != 'XDB') then
if (dictionary_obj_type = 'FUNCTION' or
dictionary_obj_type = 'INDEX' or
dictionary_obj_type = 'PACKAGE' or
dictionary_obj_type = 'PACKAGE BODY' or
dictionary_obj_type = 'PROCEDURE' or
dictionary_obj_type = 'SYNONYM' or
dictionary_obj_type = 'TABLE' or
dictionary_obj_type = 'TABLESPACE' or
dictionary_obj_type = 'TYPE' or
dictionary_obj_type = 'VIEW' or
dictionary_obj_type = 'USER'
+)then+
if (dictionary_obj_type != 'PACKAGE BODY'
+) then+
sql_text := 'select count(*) from ALL_OBJECTS where owner = :1 and object_name = :2 and object_type = :3';
execute immediate sql_text into val using dictionary_obj_owner, dictionary_obj_name, dictionary_obj_type;
if (val = 0) then
sql_text := 'select count(*) from dropped_xdb_instll_tab where owner = :1 and object_name = :2 and object_type = :3';
execute immediate sql_text into val using dictionary_obj_owner, dictionary_obj_name, dictionary_obj_type;
if (val = 0) then
insert into xdb_installation_tab values
+(dictionary_obj_owner, dictionary_obj_name, dictionary_obj_type);+
end if;
end if;
end if;
else
raise_application_error(-20000, 'Trigger xdb_installation_trigger does not support object creation of type '||dictionary_obj_type);
end if;
end if;
end;
+/+
/********************************************************************************/

i'm so careless, after checking a fresh installation of the same version DB, i dont found xdb_installation_trigger.
so just by simply remove that trigger & everything works just fine. :)

Web service proxy creation issue

am facing an issue with the creation of web service proxy for an esb project that i have created based on oracle esb tutorial. In the web service proxy creation wizard, it is accepting the concrete URL for the wsdl in the first step however in the second step it is not showing any endpoint URL. Also the wizard does not allow to go beyond step 2 of the web service proxy creation. following is my wsdl to which the concrete wsdl url points to. What am i missing here. Please help
following is my wsdl
<?xml version= '1.0' encoding= 'UTF-8' ?>
<definitions
name="custinsoap_RS"
targetNamespace="http://oracle.com/esb/namespaces/custdata"
xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:tns="http://oracle.com/esb/namespaces/custdata"
xmlns:inp1="http://xmlns.oracle.com/Esb/CustomerData"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">
<types>
<schema xmlns="http://www.w3.org/2001/XMLSchema" >
<import namespace="http://xmlns.oracle.com/Esb/CustomerData" schemaLocation="public_html/LegacyCustomer.xsd" />
</schema>
</types>
<message name="CustomerData_request">
<part name="CustomerData" element="inp1:CustomerData"/>
</message>
<portType name="Readcustsoapdata_ppt">
<operation name="Readcustsoapdata">
<input message="tns:CustomerData_request"/>
</operation>
</portType>
<binding name="readsoapbinding" type="tns:Readcustsoapdata_ppt">
<soap:binding style="document"
transport="http://schemas.xmlsoap.org/soap/http"/>
<operation name="Readcustsoapdata">
<soap:operation soapAction="http://oracle.com/esb/namespaces/custdata/Readcustsoapdata"/>
<input>
<soap:body use="literal" parts="CustomerData"/>
</input>
<output>
<soap:body use="literal" parts=""/>
</output>
</operation>
</binding>
<service name="readcustdatasoapservice">
<port name="soapport" binding="tns:readsoapbinding">
<soap:address location="http://myhost.mycompany.com/esb/wsil/custdata/custinsoap_RS"/>
</port>
</service>
</definitions>

Hi,
Are you accessing teh WSDl from a deployed service ? If yes, when providing the Web Service URL, did you extend the URL with ?WSDL ?
Frank

Object creation of string

Hello
Please tell me what is the difference between these two object creation of string.
String str = new String("Hello");.
String str="Hello";
Thanks.

RGEO wrote:
hello,
Is the string pool is part of a heap? Huh? I suppose yes, you could regard the String pool as part of the heap... but (I guess) that interned String objects would be placed directly into the permanent generation, which is not garbage collected... and therefore I don't really think of the permanent generation as part of the heap (except when tuning heap allocations)... but I think I'm talking over your noob head here, yes... and so to the noob-stuff.
If you get bored you might like to scan (for now) http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html#generations ... and come back to it in a couple of years time (when every second word isn't new and baffling to you;-)
jvm what will do when he encounter the following code,
String s1 = new String ("hello");The VM will:
1. Create a new String object, and then
2. copy the characters 'h','e','l','l','o' from the interned String "hello" to the new String,
3. and then assign a reference to the new String to variable s1.
Note that the result is subtley different from String s1 = "hello", which just does step 3... it assigns a reference to the existing interned String object "hello" to the variable s1... it does not create and "populate" a new String object.
Try this just for fun... what is the output of the following program? Why?
package forums;
public class StringEquals
public static void main(String[] args) {
    try {
      String a = "Hello";
      String b = "Hello";
      System.out.println("a==b is "+(a==b));
      String c = new String("Hello");
      System.out.println("a==c is "+(a==c));
    } catch (Exception e) {
      e.printStackTrace();
}Now, what's the correct way to evaluate equality of String objects in Java?
HTH. Cheers. Keith.

RE: Re[2]: Service Object events and LockMgr

I think there are a lot to implement a lock manager. If several objects
should be updated in one transaction, the lock manager should be able to
handle rollbacks. Other things like release lock when exception happens,
avoiding dead locks, etc. Most of the features are provided by DBMS, so
I think using a option 2 would be a better solution.
-----Original Message-----
From: Dimitar Gospodinov [mailto:[email protected]]
Sent: Wednesday, July 28, 1999 2:44 PM
To: Peter Sham
Cc: Duncan Kinnear; [email protected]
Subject: Re[2]: Service Object events and LockMgr
Hello Peter,
Wednesday, July 28, 1999, 9:19:10 PM, you wrote:
PS> Hi,
PS> Just wonder exactly how this Lock Manager can be
implemented. Do you mean that you are
PS> going to cache every object that is instantiated from the
database? Or you just cache
PS> the object id, primary key, etc?
PS> Frankly speaking, I won't attempt to due with this kind
of currency coding myself as
PS> the database vendor has spent years in coding just to do this.
PS> Regards.
The second one - you just need some unique value that will identify
the object being locked. You should register with the Lock
Manager only
the objects that you want to lock.
For me, one of the goal of such pattern is to give you some freedom
from the specifics of the database lock mechanism.
Another benefit that I can see is that using such approach you can
always answer to the question: "Can I modify/delete this object?".
Best regards,
Dimitar mailto:[email protected]
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I think there are a lot to implement a lock manager. If several objects
should be updated in one transaction, the lock manager should be able to
handle rollbacks. Other things like release lock when exception happens,
avoiding dead locks, etc. Most of the features are provided by DBMS, so
I think using a option 2 would be a better solution.
-----Original Message-----
From: Dimitar Gospodinov [mailto:[email protected]]
Sent: Wednesday, July 28, 1999 2:44 PM
To: Peter Sham
Cc: Duncan Kinnear; [email protected]
Subject: Re[2]: Service Object events and LockMgr
Hello Peter,
Wednesday, July 28, 1999, 9:19:10 PM, you wrote:
PS> Hi,
PS> Just wonder exactly how this Lock Manager can be
implemented. Do you mean that you are
PS> going to cache every object that is instantiated from the
database? Or you just cache
PS> the object id, primary key, etc?
PS> Frankly speaking, I won't attempt to due with this kind
of currency coding myself as
PS> the database vendor has spent years in coding just to do this.
PS> Regards.
The second one - you just need some unique value that will identify
the object being locked. You should register with the Lock
Manager only
the objects that you want to lock.
For me, one of the goal of such pattern is to give you some freedom
from the specifics of the database lock mechanism.
Another benefit that I can see is that using such approach you can
always answer to the question: "Can I modify/delete this object?".
Best regards,
Dimitar mailto:[email protected]
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive
<URL:http://pinehurst.sageit.com/listarchive/forte>
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Re: Service Object events and LockMgr

On the option that you have considered, I have implemented the same model
in my previous project (using Java/RMI), but I felt that it is more than
what is normally needed for concurrency protection.
I can suggest another option that is worth considering which is in place in
our app for concurrency.
Almost every table in our db has created By, created On, modifed By,
modified On columns. The parent class of all business objects has
attributes that correspond to these four columns. In addition to these
four, there is a fifth attribute (introduced when concurrency was built)
called originalModifiedOn. Upon retrieval from the db, it is set to
modifiedOn value (from the db), during UPDATE, the value in this column is
added part of the WHERE clause. So when the second user tried to do save
the same object, the underlying db update will get a 'zero rows updated'
which is translated into an application error 'possible concurrency
error'. The user re-retreives the now 'stale' object before applying their
edits.
A lot of these things are and can be built into the framework imposing very
little work that each Object needs to do to have concurrency protection.
I am not sure if there is a mention in the Patterns paper of this model,
but it is very easy to implement and supports what is needed.
Kishore Puvvada's Mail
[email protected] on 07/28/99 01:47:00 AM
To: [email protected]@INTERNET
cc: (bcc: Kishore Puvvada/HQ-IS/TAL)
Subject: Service Object events and LockMgr
Hi folks,
We're currently looking at strategies for dealing with the simultaneous
updates to the database from multiple clients (concurrency
management). That is when two (or more) clients load the same object to
edit it, then make different changes and save them to the database.
We have a copy of a Forté document (from the "Patterns" course, I
think) which describes three methods of dealing with this:
1) Lock the database table row as soon as a client select it for editing
and hold the lock until it is saved.
2) Immediately before 'saving' check that the database hasn't changed
(either by reading what's there before updating, or by using a huge
'where' clause that contains all unchanged fields)
3) The Forté "LockMgr" pattern, which uses a service object with notifier
proxies to allow locking and updating notification between the clients.
Option 3 is obviously the most robust method, but it requires a fair
amount of coding and could also be a bottleneck for database reads and
writes.
But I have another option for which I was looking for opinions. What if
we had a "Change Event manager" which broadcast an event every time
a change is made to the database. Each business class would have its
own event. If the event had the object's primary key as a parameter, then
clients editing that particular object type could check to see if the object
currently on screen is the one that changed. That way you could disable
the 'save' until they had refreshed their on-screen data.
It's not particularily elegant, but it's reasonably simple to implement. It
also deals with changes sent across our WAN from other database
servers.
But this option is only worthwhile if you can replicate the "Change Event
manager" SO and still register for an event on the client. Can clients
register for SO events and receive an event generated by any of the SO's
replicates? Or when you register for an SO's event do you register for
only one instance of the SO?
Thanks in advance for any answers.
Cheers,
Duncan Kinnear,
McCarthy and Associates, Email:
[email protected]
PO Box 764, McLean Towers, Phone: +64 6 834 3360
Shakespeare Road, Napier, New Zealand. Fax: +64 6 834 3369
Providing Integrated Software to the Meat Processing Industry for over 10
years
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:
http://pinehurst.sageit.com/listarchive/forte>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
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On the option that you have considered, I have implemented the same model
in my previous project (using Java/RMI), but I felt that it is more than
what is normally needed for concurrency protection.
I can suggest another option that is worth considering which is in place in
our app for concurrency.
Almost every table in our db has created By, created On, modifed By,
modified On columns. The parent class of all business objects has
attributes that correspond to these four columns. In addition to these
four, there is a fifth attribute (introduced when concurrency was built)
called originalModifiedOn. Upon retrieval from the db, it is set to
modifiedOn value (from the db), during UPDATE, the value in this column is
added part of the WHERE clause. So when the second user tried to do save
the same object, the underlying db update will get a 'zero rows updated'
which is translated into an application error 'possible concurrency
error'. The user re-retreives the now 'stale' object before applying their
edits.
A lot of these things are and can be built into the framework imposing very
little work that each Object needs to do to have concurrency protection.
I am not sure if there is a mention in the Patterns paper of this model,
but it is very easy to implement and supports what is needed.
Kishore Puvvada's Mail
[email protected] on 07/28/99 01:47:00 AM
To: [email protected]@INTERNET
cc: (bcc: Kishore Puvvada/HQ-IS/TAL)
Subject: Service Object events and LockMgr
Hi folks,
We're currently looking at strategies for dealing with the simultaneous
updates to the database from multiple clients (concurrency
management). That is when two (or more) clients load the same object to
edit it, then make different changes and save them to the database.
We have a copy of a Forté document (from the "Patterns" course, I
think) which describes three methods of dealing with this:
1) Lock the database table row as soon as a client select it for editing
and hold the lock until it is saved.
2) Immediately before 'saving' check that the database hasn't changed
(either by reading what's there before updating, or by using a huge
'where' clause that contains all unchanged fields)
3) The Forté "LockMgr" pattern, which uses a service object with notifier
proxies to allow locking and updating notification between the clients.
Option 3 is obviously the most robust method, but it requires a fair
amount of coding and could also be a bottleneck for database reads and
writes.
But I have another option for which I was looking for opinions. What if
we had a "Change Event manager" which broadcast an event every time
a change is made to the database. Each business class would have its
own event. If the event had the object's primary key as a parameter, then
clients editing that particular object type could check to see if the object
currently on screen is the one that changed. That way you could disable
the 'save' until they had refreshed their on-screen data.
It's not particularily elegant, but it's reasonably simple to implement. It
also deals with changes sent across our WAN from other database
servers.
But this option is only worthwhile if you can replicate the "Change Event
manager" SO and still register for an event on the client. Can clients
register for SO events and receive an event generated by any of the SO's
replicates? Or when you register for an SO's event do you register for
only one instance of the SO?
Thanks in advance for any answers.
Cheers,
Duncan Kinnear,
McCarthy and Associates, Email:
[email protected]
PO Box 764, McLean Towers, Phone: +64 6 834 3360
Shakespeare Road, Napier, New Zealand. Fax: +64 6 834 3369
Providing Integrated Software to the Meat Processing Industry for over 10
years
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:
http://pinehurst.sageit.com/listarchive/forte>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/forte>

Service Object events and LockMgr

Hi folks,
We're currently looking at strategies for dealing with the simultaneous
updates to the database from multiple clients (concurrency
management). That is when two (or more) clients load the same object to
edit it, then make different changes and save them to the database.
We have a copy of a Forté document (from the "Patterns" course, I
think) which describes three methods of dealing with this:
1) Lock the database table row as soon as a client select it for editing
and hold the lock until it is saved.
2) Immediately before 'saving' check that the database hasn't changed
(either by reading what's there before updating, or by using a huge
'where' clause that contains all unchanged fields)
3) The Forté "LockMgr" pattern, which uses a service object with notifier
proxies to allow locking and updating notification between the clients.
Option 3 is obviously the most robust method, but it requires a fair
amount of coding and could also be a bottleneck for database reads and
writes.
But I have another option for which I was looking for opinions. What if
we had a "Change Event manager" which broadcast an event every time
a change is made to the database. Each business class would have its
own event. If the event had the object's primary key as a parameter, then
clients editing that particular object type could check to see if the object
currently on screen is the one that changed. That way you could disable
the 'save' until they had refreshed their on-screen data.
It's not particularily elegant, but it's reasonably simple to implement. It
also deals with changes sent across our WAN from other database
servers.
But this option is only worthwhile if you can replicate the "Change Event
manager" SO and still register for an event on the client. Can clients
register for SO events and receive an event generated by any of the SO's
replicates? Or when you register for an SO's event do you register for
only one instance of the SO?
Thanks in advance for any answers.
Cheers,
Duncan Kinnear,
McCarthy and Associates, Email: [email protected]
PO Box 764, McLean Towers, Phone: +64 6 834 3360
Shakespeare Road, Napier, New Zealand. Fax: +64 6 834 3369
Providing Integrated Software to the Meat Processing Industry for over 10 years
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Hi,
Just wonder exactly how this Lock Manager can be implemented. Do you mean that you are
going to cache every object that is instantiated from the database? Or you just cache
the object id, primary key, etc?
Frankly speaking, I won't attempt to due with this kind of currency coding myself as
the database vendor has spent years in coding just to do this.
Regards.
Dimitar Gospodinov wrote:
Hello Duncan,
Wednesday, July 28, 1999, 10:31:46 AM, you wrote:
DK> Hi folks,
DK> We're currently looking at strategies for dealing with the simultaneous
DK> updates to the database from multiple clients (concurrency
DK> management). That is when two (or more) clients load the same object to
DK> edit it, then make different changes and save them to the database.
DK> We have a copy of a Forté document (from the "Patterns" course, I
DK> think) which describes three methods of dealing with this:
DK> 1) Lock the database table row as soon as a client select it for editing
DK> and hold the lock until it is saved.
DK> 2) Immediately before 'saving' check that the database hasn't changed
DK> (either by reading what's there before updating, or by using a huge
DK> 'where' clause that contains all unchanged fields)
DK> 3) The Forté "LockMgr" pattern, which uses a service object with notifier
DK> proxies to allow locking and updating notification between the clients.
DK> Option 3 is obviously the most robust method, but it requires a fair
DK> amount of coding and could also be a bottleneck for database reads and
DK> writes.
DK> But I have another option for which I was looking for opinions. What if
DK> we had a "Change Event manager" which broadcast an event every time
DK> a change is made to the database. Each business class would have its
DK> own event. If the event had the object's primary key as a parameter, then
DK> clients editing that particular object type could check to see if the object
DK> currently on screen is the one that changed. That way you could disable
DK> the 'save' until they had refreshed their on-screen data.
DK> It's not particularily elegant, but it's reasonably simple to implement. It
DK> also deals with changes sent across our WAN from other database
DK> servers.
DK> But this option is only worthwhile if you can replicate the "Change Event
DK> manager" SO and still register for an event on the client. Can clients
DK> register for SO events and receive an event generated by any of the SO's
DK> replicates? Or when you register for an SO's event do you register for
DK> only one instance of the SO?
DK> Thanks in advance for any answers.
DK> Cheers,
DK> Duncan Kinnear,
DK> McCarthy and Associates, Email: [email protected]
DK> PO Box 764, McLean Towers, Phone: +64 6 834 3360
DK> Shakespeare Road, Napier, New Zealand. Fax: +64 6 834 3369
DK> -------------------------------------------------------------------------------
DK> Providing Integrated Software to the Meat Processing Industry for over 10 years
DK> -
DK> To unsubscribe, email '[email protected]' with
DK> 'unsubscribe forte-users' as the body of the message.
DK> Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/forte>
I would recommend you to use the following approach (of course if you
do not have some special requirements :) ):
1. You should have a LockManager that will synchronize all clients in
their attempt to modify/delete objects in your application.
2. Each client, when attempts to modify/delete some object, it must
LOCK it using the services provided with the LockManager.
3. The requested operation can be performed only after successful
locking.
4. If a lock can not be obtained (for example if the object is already
locked by some other client) then the operation is aborted.
The details of this pattern depends on your needs. :)
Hope this helps.
Best regards,
Dimitar mailto:[email protected]
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Cost of object creation vs reflection?

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ranko

i agree. in such cases, you should do the simplest thing that could possibly work. there are legitimate uses for reflection. without reflection, we have no core serialization mechanism. without serialization, we have no core RPC mechanism (RMI). no dynamic proxies without reflection. all those neat visual building tools are hampered without reflection. ORBs and scripting languages like Jython are hindered.
note that the legitimate uses of reflection shown above tend to be for core JDK, or for development tools. that should be a clue to the developer that unless you're building these kinds of systems, you should reconsider whether reflection is necessary.
that said, reflection has a high "cool" factor. i think that's what sucks developers toward it. it sucked me in, that's for sure. 8^)
--p

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Dear Experts,
When user created Service PO with T-code ME21, Service PR amount is not reduced from CJI5 report & also increased budget in CJ30.
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Hiiii...
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