Hello, every one. I met the following problem when trying to use tapestry-ioc
in a standalone program. According to the tapestry official site, a service
builder method should be invoked multiple times, if it is annotated with
@Scope("perthread") and the service is used in multi threads. So I wrote the
following program, trying to demonstrate it. In the program, ServiceA is
used in two threads, but the builder method is invoked only one time. Why?
public class Main {
public static void main(String[] args) {
RegistryBuilder regBuilder = new RegistryBuilder();
regBuilder.add(ModuleA.class);
final Registry reg = regBuilder.build();
final ServiceA a = reg.getService(ServiceA.class);
a.print();
new Thread() {
@Override
public void run() {
ServiceA aInAnotherThread = reg.getService(ServiceA.class);
aInAnotherThread.print();
}
}.start();
}
}
public class ServiceA {
public ServiceA() {
System.out.println("A new instance of ServiceA is under
construction!");
}
public void print() {
System.out.println(this);
}
}
public class ModuleA {
@Scope("perthread")
public static ServiceA builder() {
System.out.println("Building a new instance of ServiceA ...");
return new ServiceA();
}
}
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