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Remote object activation works a little differently from normal RMI servers To be locatable, a service must be available through an RMI registry, but to do that normally requires an object to be instantiated Since the whole point is to avoid instantiating RMI servers and instead to activate them as required, a faulting remote reference is registered in its place A faulting remote reference is a remote reference that acts as a proxy between the remote client and the as-yet-unactivated server Unlike a UnicastRemoteObject server, which runs indefinitely, a server installation program runs for a short duration Its purpose is to notify the activation system of an activatable remote object, and to register the faulting remote reference with the rmiregistry (see Figure 11-9) Once the registration is complete, the server installation program can terminate; creating the remote object is now the responsibility of the faulting reference and the remote method activation system daemon Figure 11-9 Server installation program registers activatable object with rmid, and faulting reference with rmiregistry

The first thing you need is a way to represent the user dataThe things you need to store for each user are as follows:

critical implements a critical section for mutual exclusion In other words, only one thread at a time will execute the structured block within a critical section The other threads will wait their turn at the top of the construct The syntax of a critical section is

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At some point in time in the future, an RMI client will look up the rmiregistry and select the service provided by the faulting remote reference When the faulting reference is activated, it checks to see if it already has a reference to the server The first time the faulting reference receives a call, the reference will be null, indicating that the server must be activated before being used It enlists the aid of the rmid application, to create a new instance of the server, and then

#pragma omp critical [(name)] { a structured block }

The username The user s password A flag indicating if the user is currently enabled A list of authorizations or roles associated with that user

passes the call to the newly activated object (see Figure 11-10) Method requests to the faulting reference are forwarded onward to the activated object, and then returned back to the client Though there is a slight delay on wakeup, this is not repeated for subsequent requests, as the service is ready for action Figure 11-10 Faulting reference, with the aid of activation system, passes information from activated object back to client

where name is an identifier that can be used to support disjoint sets of critical sections A critical section implies a call to flush on entry to and on exit from the critical section

The elegance of this solution resides in the fact that the client is, at all times, completely unaware of the details of server implementation Although there may be some slight delay in creating the remote object initially, subsequent calls are faster, and the client does not know whether the server has always been running or was only recently activated This means no extra code to compile, and no extra work for client developers

These elements can be stored together in a single class Listing 2-6 shows this within the User class

Creation of an activatable remote object is a little different from that of a UnicastRemoteObject, but the code is fairly similar Let's start with an extremely simple remote interface, and see how it would be implemented as an activatable remote object

barrier provides a synchronization point at which the threads wait until every member of the team has arrived before any threads continue The syntax of a barrier is

package comsimpledbbookuser; import javaio*; import javautil*; public class User implements Serializable { private String username; private String password; private boolean enabled; private List<String> authorities = new ArrayList<String>();

public interface MyRemoteInterface extends javarmiRemote { public void doSomething () throws javarmiRemoteException; }

A barrier can be added explicitly, but it is also implied where it makes sense (such as at the end of parallel or worksharing constructs) A barrier implies a flush Critical sections, barriers, and flushes are discussed further in the Implementation Mechanisms design space Returning to our example in Fig A5, we can safely include the call to the combine() routine inside the parallel loop if we enforce mutual exclusion We will do this with the critical construct as shown in Fig A11 Notice that we had to create a private copy of the variable res to prevent conflicts between iterations of the loop

The RMI service interface contains a single method, doSomething(), which takes no parameters and may throw a RemoteException There's no difference between a normal remote interface and one that will be implemented by an activatable remote object In fact, an interface can be implemented by both an activatable object and a UnicastRemoteObject The next step is to create an implementation that extends the javarmi activationActivatable class It must implement our RMI interface and provide both a

public User(String u, String p, boolean en, List<String> au) { username = uintern(); password = pintern(); enabled = en; auget(0)charAt(0); for (String auth : new TreeSet<String>(au)) { authoritiesadd(authintern()); } } String getUsername() { return username; } String getPassword() { return password; } boolean isEnabled() { return enabled; } List<String> getAuthorities() { return authorities; } @Override public boolean equals(Object o) { if (o == null) return false; if (!(o instanceof User)) return false; User other = (User) o; if (otherusername != username) return false; if (otherpassword != password) return false; if (otherenabled != enabled) return false; if (!otherauthoritiesequals(authorities)) return false; return true; } @Override public int hashCode() { int prime = 37; int result = 23; result = result * prime + usernamehashCode(); result = result * prime + passwordhashCode(); result = result * prime + (enabled 1 : 0);

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