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55 Latency
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Clients of remote objects must deal with latency: the client must wait be latent for the server to execute How long this should take, and how long is too long, depends on a number of factors, including:
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network bandwidth network load (fraction of nominal bandwidth currently available) server capacity (CPU speed, disk speed, database performance, and so on) server load (queue lengths, paging degradation, and so on) expected time the remote method takes to execute, measured at the server invocation delays due to RMI in general
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invocation delays due to RMI Activation: in particular, the delay in starting up a new activation group
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By default, an RMI client waits forever for a remote method to complete A timeout can be set on the client socket by using a custom socket factory: see 11 If a remote method takes longer than the timeout you have specified via a client socket factory, an InterruptedIOException will be thrown, which will appear at the client with an UnmarshalException wrapped around it
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56 Applets
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A Java applet can be an RMI client An applet does not generally have sufficient permission to be an RMI server Applets always run under the control of a Java security manager This topic is discussed in 8 For the present, we just note that a security manager checks practically all interactions with the outside world against a predefined set of permissions, and causes a javalangSecurityException to be thrown if the action is not permitted Applets don't have many permissions, but they do generally have permission to communicate with the host from which they were loaded This means that applets can communicate with RMI servers and an RMI registry at that host without special permissions having to be configured Consult the JDK documentation, and browser documentation, for further information on how to construct an applet, and how to configure extra permissions for an applet
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57 Exercises
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1:Construct an applet version of the unmodified RemoteEchoClient and run it via the Java appletviewer 2:Modify the RemoteEchoClient to set a default socket factory via RMISocketFactorysetSocketFactory which returns client Sockets with a 100 ms timeout (via SocketsetSoTimeout) Execute the client a few times at various intervals, and describe the results (For information on socket factories see 11) 3:Experiment with timeout period of the previous exercise to determine the shortest practical client timeout on a busy LAN
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6 Naming I RMI registry
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Purpose How it works Names in the registry Naming class Registry interface registry exceptions Names and URLs Setup Configurations Utilities Alternative naming services Exercises
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61 In this chapter
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The RMI registry is a naming service which provides clients with a mechanism to find one or more initial RMI servers This chapter describes the RMI registry's API and configuration For alternate naming services see 13
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62 Purpose
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"The Registry is a remote object that maps names to remote objects"[1]
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Online documentation, JDK 13
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The RMI registry is a naming service: it provides a name to address lookup service like the white pages in a phone book An RMI server is listed under a name The listing for the server contains its RMI address, an equivalent of a phone number Like the phone book, the registry is a set of {name, address} pairs as illustrated in Figure 61
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Figure 61 RMI registry
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You are not obliged to use the registry in an RMI application You must either use some naming
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service: either the RMI registry discussed in this chapter, a JNDI or Jini service as discussed in 13; or else use activatable stubs exclusively, as discussed in 10, with a MarshalledObject bootstrapping technique
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63 How it works
Initially, the only remote method available to a client is a lookup in a naming service In 15 we saw that a remote stub can only be obtained via a return value of another remote method invocation[2] To close off this apparent circularity, obviously you have to start somewhere The place you start, the "bootstrap", is the RMI registry