A small example of using a thread pool to process socket requests

Task Description: A program is designed to listen to port 8790 of the Local Machine. When a socket is connected, a thread pool is used to create a processing thread. After processing, a processing thread is returned and the main program is not involved in the service.

 

Paste the Code directly:

 

Master Server

 

Package COM. SDC. callmaxent. socket; <br/> Import Java. io. ioexception; <br/> Import java.net. serversocket; <br/> Import java.net. socket; <br/> Import Java. util. concurrent. arrayblockingqueue; <br/> Import Java. util. concurrent. threadpoolexecutor; <br/> Import Java. util. concurrent. timeunit; <br/> Import COM. SDC. callmaxent. util. systemconfig; <br/> public class callmaxentthreadpool {<br/> Private Static int producetasksleeptime = 20; <br/> Private Static int producetaskmasknumber = 10; </P> <p> Private Static Boolean flag = false; </P> <p> Public static void main (string [] ARGs) {<br/> startserv (); <br/> // construct the thread pool <br/> system. out. println ("server listening ...... "); </P> <p> int Port = systemconfig. getinstance (). getport (); <br/> serversocket = NULL; <br/> try {<br/> serversocket = new serversocket (port ); <br/>} catch (ioexception E1) {<br/> e1.printstacktrace (); <br/>}< br/> socket clientsocket = NULL; <br/> threadpoolexecutor threadpool = new threadpoolexecutor (<br/> 2, // corepoolsize <br/> 4, // maximumpoolsize <br/> 3, // KeepAliveTime <br/> timeunit. seconds, // Unit <br/> New arrayblockingqueue <runnable> (3), // workqueue <br/> New threadpoolexecutor. discardoldestpolicy () // <br/>); </P> <p> int I = 0; <br/> while (FLAG) {<br/> // obtain the client request <br/> try {<br/> clientsocket = serversocket. accept (); <br/>}catch (ioexception e) {<br/> E. printstacktrace (); <br/>}< br/> string task = "maxent_task @" + I; <br/> system. out. println ("put" + task); <br/> threadpool.exe cute (New callmaxentthreadpooltask (clientsocket); <br/> I ++; <br/>}</P> <p> Public static void startserv () {<br/> flag = true; <br/>}</P> <p> Public static void stopserv () {<br/> flag = false; <br/>}< br/>}

 

Process thread Program

 

Package COM. SDC. callmaxent. socket; <br/> Import Java. io. bufferedreader; <br/> Import Java. io. ioexception; <br/> Import Java. io. inputstream; <br/> Import Java. io. inputstreamreader; <br/> Import Java. io. outputstream; <br/> Import Java. io. printwriter; <br/> Import Java. io. serializable; <br/> Import java.net. socket; <br/> Import COM. SDC. callmaxent. util. fileutil; <br/> Import COM. SDC. callmaxent. util. socketutil; <B R/> Import COM. SDC. callmaxent. util. systemconfig; <br/> public class callmaxentthreadpooltask implements runnable, serializable {<br/> Private Static final long serialversionuid = 0; <br/> Private Static int consumetasksleeptime = 20000; </P> <p> private Socket socket; <br/> private inputstream clientinput; <br/> private outputstream clientoutput; </P> <p> callmaxentthreadpooltask (Socket socket) {<br/> thi S. socket = socket; </P> <p> try {<br/> This. clientinput = socket. getinputstream (); <br/> This. clientoutput = socket. getoutputstream (); <br/>} catch (ioexception e) {<br/> E. printstacktrace (); <br/>}</P> <p> Public void run () {<br/> bufferedreader breader = fileutil. getbufferreader (New inputstreamreader (clientinput); <br/> try {<br/> // receives information from the client <br/> string strline = breader. readline (); <br/> // parameter segmentation <Br/> string [] paramlist = strline. split (","); <br/> string maxentpath = systemconfig. getinstance (). getmaxentpath (); </P> <p> string cmd = "CMD/C Java-mx1024m-jar" + maxentpath + "/maxent. jar "; </P> <p> for (INT I = 1; I <paramlist. length; I ++) {<br/> cmd + = "" + paramlist [I]; <br/>}< br/> system. out. println (thread. currentthread (). getname (); <br/> system. out. println ("maxent" + paramlist [0] + "is running, pleas E wait! "); </P> <p> cmd + =" novisible Autorun "; </P> <p> PROCESS p = runtime.getruntime(cmd.exe C (CMD); <br/> P. waitfor (); <br/> printwriter = new printwriter (clientoutput, true); <br/> printwriter. println ("finish! "); <Br/> system. Out. println (" task "+ paramlist [0] +" finish! "); <Br/>}catch (ioexception e) {<br/> E. printstacktrace (); <br/>} catch (interruptedexception e) {<br/> E. printstacktrace (); <br/>}finally {<br/> fileutil. close (clientinput); <br/> fileutil. close (clientoutput); <br/> socketutil. close (socket); <br/>}< br/>

 

Test Client

 

Package COM. SDC. callmaxent. socket; <br/> Import Java. io. bufferedreader; <br/> Import Java. io. ioexception; <br/> Import Java. io. inputstream; <br/> Import Java. io. inputstreamreader; <br/> Import Java. io. outputstream; <br/> Import Java. io. printwriter; <br/> Import java.net. socket; <br/> Import java.net. unknownhostexception; <br/> Import COM. SDC. callmaxent. util. fileutil; <br/> Import COM. SDC. callmaxent. util. socketutil; <br/> Import COM. SDC. callmaxent. util. systemconfig; <br/> public class callmaxentclient {<br/> Public static void main (string [] ARGs) {<br/> try {<br/> system. out. println ("start sending ...... "); </P> <p> string IPaddress = systemconfig. getinstance (). getip (); <br/> int Port = systemconfig. getinstance (). getport (); </P> <p> Socket socket = socketutil. getsocket (IPaddress, Port); <br/> bufferedreader bfreader = fileutil. getbufferreader (New inputstreamreader (system. in); <br/> system. out. println ("waiting ..... "); <br/> string strline =" 1, environmentallayers = F:/test/maxent/testdata/layers, samplesfile = F:/test/maxent/testdata/bradypus.csv, outputdirectory = F:/test/maxent/testdata/outputs, togglelayertype = ecoreg, redoifexists "; <br/> // string strline =" environmentallayers = F: /test/maxent/testdata/layers, samplesfile = F:/test/maxent/testdata/bradypus.csv, outputdirectory = F:/test/maxent/testdata/outputs2, togglelayertype = ecoreg, redoifexists "; </P> <p> outputstream = socket. getoutputstream (); <br/> inputstream = socket. getinputstream (); </P> <p> printwriter PW = new printwriter (outputstream, true); </P> <p> PW. println (strline); <br/> bufferedreader BR = new bufferedreader (New inputstreamreader (inputstream); <br/> system. out. println (BR. readline (); <br/>} catch (unknownhostexception e) {<br/> E. printstacktrace (); <br/>}catch (ioexception e) {<br/> E. printstacktrace (); <br/>}< br/>

 

Thread pool execution priority

 

Corepoolsize> workqueue> maximumpoolsize-> Handler