File transfer using rmi java

The concept even allows for daisy-chaining: client requests a stream from server 1 which in turn requests the stream from server 2. And it automatically creates proxy stub classes which UnicastRemoteObject. Still for file transfer the implementation has a drawback: The copy method reads and writes blocks and either call is a remote call.

Even with infinite bandwidth, to transfer MB using 64 KB blocks would cost us 80s assuming a latency of 50ms. A larger block size improves the performance, but we shouldn't waste memory. The trick to improve performance is to perform the file transfer "inline" as part of the RMI serialization.

RMIPipe is a serializable object that during serialization transfers data from an input to an output stream. The serialization reads data from an InputStream instead of serializing some class variables, the deserialization writes data to an OuputStream. Actually it's two implementations in one. Initialized on a local OutputStream, it will register the OutputStream locally in a static registry. The registration key will be delivered to the remote side. Initialized on a local InputStream, it will remember the stream and serialize it if the RMIPipe instance is serialized.

Active Oldest Votes. Improve this answer. Anon Anon 91 1 1 bronze badge. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back The compute engine server: accepts tasks from clients executes the tasks returns any results, if any.

It is comprised of an interface and a class. The interface File Download Using Rmi In Java Compiler defines the client's view of the remote object, the compute server; the class provides the server's implementation.

The Interface At the heart of the compute engine is a protocol that: allows jobs to be submitted to the compute engine the compute engine to run those jobs the results of the job to be returned to the client. This protocol is expressed in 2 interfaces, one supported by the compute engine; the other supported by the objects that are submitted to the compute engine. The compute engine's interface, Compute , allows jobs to be submitted to the engine The client interface, Task , defines how the compute engine executes a task.

The Compute interface defines the remotely accessible partthe compute engine itself: package compute; import java. RemoteException in its throws clause.

Since the return value for the executeTask and execute methods is of type Object , any task that would return a primitive type, e. The Task interface extends the java. Serializable interface because all method parameter and return values are serialized. Implementations of the Task object are downloaded by RMI into the compute engine's virtual machine when needed.

Implementing the Compute Server Implement the Compute interface Declare the remote interface being implemented Define the no-argument constructor for the remote object Implement each remote method in the remote interface Define a main method that Creates and installs a security manager Creates an instance of the remote object Registers the remote object with the RMI remote object registry package engine; import java.

In JDK 1.