Is there clean way to pass context data to @Asynchronous ejb call?

问题

In wildfly I execute stateless ejb method asynchronously (it is mapped with @Asynchronous annotation). In the calling method I have some context information in thread local. What is the best way to pass this data to async method? I don't want to add additional parameter to async method signature.

回答1:

Essentially you have only 2 options:

1. Passing value as a parameter
2. Storing that value in some global place. Like static variable.

The first option is much cleaner and easier. Don't use the second one :)

回答2:

With a bit of ugly plumbing it can be resolved as follows (wildfly 8.x.x):

if (SecurityContextAssociation.getSecurityContext()==null)
    SecurityContextAssociation.setSecurityContext(new JBossSecurityContext("background-job"));
SecurityContext current = SecurityContextAssociation.getSecurityContext();
final Object cred = current.getUtil().getCredential();
final Subject s = current.getUtil().getSubject();
final Principal up = current.getUtil().getUserPrincipal();
boolean needToUpdatePrincipal=true;
if (up instanceof TenantPrincipal) {
    if (t.getTenantName().equals(((TenantPrincipal) up).getAdditonalField())) {
        needToUpdatePrincipal=false;
    }
}
if (needToUpdatePrincipal) {
    TenantPrincipal tp=new TenantPrincipal(up.getName());
    tp.setAdditionalField(t.getTenantName());
    current.getUtil().createSubjectInfo(
            , cred, (Subject) s);
}

Basically you need to create your own Principal class and set context data in the additional field of its instance.

来源：https://stackoverflow.com/questions/37430969/is-there-clean-way-to-pass-context-data-to-asynchronous-ejb-call