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01-Reactor编程模型-预习资料.pdf

Reactor

java

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01-Reactor编程模型-预习资料.pdf

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http://gee.cs.oswego.edu

Scalable IO in Java

Doug Lea

State University of New York at Oswego

dl@cs.oswego.edu

http://gee.cs.oswego.edu

Outline

Scalable network services

Event-driven processing

Reactor pattern

Basic version

Multithreaded versions

Other variants

Walkthrough of java.nio nonblocking IO APIs

http://gee.cs.oswego.edu

Network Services

Web services, Distributed Objects, etc

Most have same basic structure:

Read request

Decode request

Process service

Encode reply

Send reply

But differ in nature and cost of each step

XML parsing, File transfer, Web page

generation, computational services, ...

http://gee.cs.oswego.edu

Classic Service Designs

client

Server

read

decode

compute

encode

send

read

decode

compute

encode

send

handler

read

decode

compute

encode

send

handler

Each handler may be started in its own thread

http://gee.cs.oswego.edu

Classic ServerSocket Loop

class Server implements Runnable {

public void run() {

try {

ServerSocket ss = new ServerSocket(PORT);

while (!Thread.interrupted())

new Thread(new Handler(ss.accept())).start();

// or, single-threaded, or a thread pool

} catch (IOException ex) { /* ... */ }

}

static class Handler implements Runnable {

final Socket socket;

Handler(Socket s) { socket = s; }

public void run() {

try {

byte[] input = new byte[MAX_INPUT];

socket.getInputStream().read(input);

byte[] output = process(input);

socket.getOutputStream().write(output);

} catch (IOException ex) { /* ... */ }

}

private byte[] process(byte[] cmd) { /* ... */ }

}

Note: most exception handling elided from code examples

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