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any of the examples in earlier chapters use RMI/Jeri proxies for services. These services live within a server whose principal task is to keep the service alive and registered with lookup services. If the server fails to renew leases, then lookup services will eventually discard the proxy; if the server fails to keep itself and its service alive, then the service will not be available when a client wants to use it. This results in a server and a service that most of the time will be idle, probably swapped out to disk, but still using virtual memory. Java memory requirements on the server side can be enormous. From JDK 1.2 onward, an extension to RMI called activation allows an idle object to be in a dormant state and brought to life when needed. In this way, the object does not occupy virtual memory while idle. Of course, another process needs to be alive to restore such objects, and RMI supplies the daemons rmid (in Jini 1.2) and phoenix (in Jini 2.0) to manage this. In effect, rmid/phoenix acts as another virtual memory manager as it stores information about dormant Java objects in its own files and restores them from there as needed. There are serious limitations to rmid and phoenix: they are Java programs themselves, and when running they also use enormous amounts of memory. So it only makes sense to use them when you expect to be running a number of largely idle services on the same machine. When a service is brought to life, or activated, a new JVM may be started to run the object. This again increases memory use. If memory use is the only concern, then a variety of other systems, such as echidna, which run multiple applications within a single JVM, may be adequate to solve memory issues. However, RMI activation is also designed to work with distributed objects, and it allows JVMs to hold remote references to objects that are no longer active. Instead of throwing a remote exception on trying to access these objects, the activation system tries to resurrect the object using rmid or phoenix to give a valid (and new) reference. Of course, if it fails to do this, it will throw an exception anyway. The standard RMI activation system is supported by Jini 2.0, in the same way as it supports JRMP. But with the advent of Jeri, Jini 2.0 has a new version of activation with the phoenix activation server, which we ll cover in the next section. In the rest of the chapter, we ll look at how to build servers and services that use the activation system. We also look at more subtle issues such as nonlazy activation and how a system that is reborn each time can save state. If a service uses activation, then it will probably not be present to renew leases or to be discovered. We look at two additional Jini services, a LeaseRenewalService and a LookupDiscovertService, which can overcome these problems.
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CHAPTER 25 ACTIVATION
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The phoenix Activation Server
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phoenix replaces rmid in Jini 2.0. It comes in a variety of versions, depending on the protocol it supports. For example, if the services use Jeri, then phoenix should be configured to use Jeri also. Similarly, if the services use JRMP, then so should phoenix. phoenix can be started by using the ServiceStarter or by shell scripts/batch files. Example scripts are given in the Jini distribution under the source/vob/jive/src/com/sun/jini/example/ hello/scripts/ directory. For example, here is the shell script jeri-phoenix.sh, which starts the Jeri version of phoenix under Unix: host=`hostname` java -Djava.security.manager= -Djava.security.policy=config/phoenix.policy -Djava.rmi.server.codebase=http://$host:8080/phoenix-dl.jar -DserverHost=$host -jar lib/phoenix.jar config/jeri-phoenix.config \ \ \ \ \
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And here is the batch file jrmp-phoenix.bat, which starts the Jeri version of phoenix under Windows: java -Djava.security.manager= ^ -Djava.security.policy=config\phoenix.policy ^ -Djava.rmi.server.codebase=http://%computername%:8080/phoenix-dl.jar ^ -DserverHost=%computername% ^ -jar lib\phoenix.jar ^ config\jrmp-phoenix.config Each script file references a configuration script. A typical script such as config/ jeri-phoenix.config contains the following: com.sun.jini.phoenix { persistenceDirectory = "lib${/}phoenix-log"; groupConfig = new String[] { "config${/}jeri-phoenix-group.config" }; } which states the directory to store the activation log files and also a group configuration file, such as jeri-phoenix-group.config. This file defines the protocol that will be used by phoenix (here, Jeri): import com.sun.jini.phoenix.AccessILFactory; import net.jini.jeri.BasicJeriExporter; import net.jini.jeri.tcp.TcpServerEndpoint; com.sun.jini.phoenix { instantiatorExporter = new BasicJeriExporter(TcpServerEndpoint.getInstance(0), new AccessILFactory()); }
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