Sacha Labourey wrote:
>Could you please try the read-only tag at the method level, as described by
>Bill. It does work. If it doesn't, it is a bug and it would be good to know
>about it.
>
>Cheers,
>
>
> Sacha
>
>
>
Well, I am confused now: are u sure <read-only> attribute can be applyed
to EBs?
I use jboss-3.0.3
So I made a simple test (I will include here only significant code). I
have a simple EB (UserBean) only with local interfaces (User and
UserHome) and
a SLSB (facade) GatewayBean with only one business method
addBalances(String uid1, String uid2), method that reads the 2 beans and
return the added balances.
BUSINESS(method from the GatewayBean):
--------------------------------------------------------------------------
public int addBalances(String uid1, String uid2) {
logger.info(uid1+","+uid2+" start");
try {
User user1 = userHome.findByPrimaryKey(new UserPK(uid1));
int balance1 = user1.getModel().balance;
User user2 = userHome.findByPrimaryKey(new UserPK(uid2));
int balance2 = user2.getModel().balance;
return (balance1 + balance2);
} catch (Exception e) {
logger.error(e);
return 0;
} finally {
logger.info(uid1+","+uid2+" end");
}
}
--------------------------------------------------------------------------
CONFIGURATION(jboss.xml):
--------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss PUBLIC
"-//JBoss//DTD JBOSS 3.0//EN"
"http://www.jboss.org/j2ee/dtd/jboss_3_0.dtd";>
<jboss>
<secure>false</secure>
<container-configurations>
<container-configuration>
<container-name>Standard CMP 2.x
EntityBean</container-name>
<commit-option>A</commit-option>
</container-configuration>
<container-configuration>
<container-name>Instance Per Transaction CMP 2.x
EntityBean</container-name>
<commit-option>A</commit-option>
</container-configuration>
</container-configurations>
<resource-managers/>
<enterprise-beans>
<session>
<ejb-name>GatewayBean</ejb-name>
<jndi-name>ejb/Gateway</jndi-name>
</session>
<entity>
<ejb-name>UserBean</ejb-name>
<local-jndi-name>ejb/User</local-jndi-name>
<!--
<configuration-name>Instance Per Transaction CMP 2.x
EntityBean</configuration-name>
-->
<configuration-name>Standard CMP 2.x
EntityBean</configuration-name>
<method-attibutes>
<method>
<method-name>getModel</method-name>
<read-only>true</read-only>
</method>
</method-attibutes>
</entity>
</enterprise-beans>
</jboss>
--------------------------------------------------------------------------
THE SCENARIO (client side):
--------------------------------------------------------------------------
public void computeBalances(String args[]){
try {
int count = Integer.parseInt(args[0]);
String uid1 = args[1];
String uid2 = args[2];
Gateway gw = getHome().create();
for (int i = 0; i < count; i++) {
logger.info("sum = "+gw.addBalances(uid1,uid2));
Thread.sleep((long)(50*Math.random()));
}
} catch (Exception e) {
logger.error(e);
}
}
--------------------------------------------------------------------------
THE RESULTS
--------------------------------------------------------------------------
"Standard CMP 2.x EntityBean" and NO <read-only> method level ->
DEADLOCK ALWAYS
"Standard CMP 2.x EntityBean" and <read-only> method level -> DEADLOCK
ALWAYS
"Instance Per Transaction CMP 2.x EntityBean" and NO <read-only> method
level -> NO DEADLOCK
"Instance Per Transaction CMP 2.x EntityBean" and <read-only> method
level -> NO DEADLOCK
--------------------------------------------------------------------------
So, what is the real semnification of the <read-only> tag applied at
method level?
And BTW, what NoLock policy really does?
Thanks.
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