Re: Bug in synchronized() ?

Bryan Armstrong wrote:

> rumi wrote:
>
>> I'm using TINOOS 1.12 but problem still exists :(
>> any ideas ?
>
>
> Please send me a short example that reproduces this problem.
>
//*************************
// source example
//*************************
package test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import com.dalsemi.tininet.http.HTTPServer;
import com.dalsemi.tininet.http.HTTPServerException;

/**
 * @author rumcajs
 */
public class SynTest {
    public static final String WEB_ROOT = "/";
    public static final String WEB_INDEX = "index.html";
    public String webLog = WEB_ROOT + "/web.log";
    private Object lock = new Object();
    static boolean debugOn = false;
    private File file;
    private int index;

    public SynTest() {
        this.file = new File(WEB_ROOT + WEB_INDEX);

        new Thread() {
            public void run() {
                try {
                    while (true) {
                        System.out.println("writing file");
                        synchronized (lock) {
                            prepareFile();
                        }
                        System.out.println("write finished");
                        Thread.sleep(1000);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

        }
        .start();
        // create an instance of HTTPServer on port httpPort
        HTTPServer httpServer = new HTTPServer(80, debugOn);
        // override the default index page
        httpServer.setIndexPage(WEB_INDEX);
        // override the default HTTP root
        httpServer.setHTTPRoot(WEB_ROOT);
        // override the default log file name
        httpServer.setLogFilename(webLog);
        try {
            httpServer.setLogging(debugOn);
        } catch (HTTPServerException h) {
            h.printStackTrace();
        }

        while (true) {
            try {
                // Threaded web server blocks on accept
                httpServer.serviceRequests(lock);
            } catch (HTTPServerException h) {
                if (debugOn) {
                    System.out.println(h.toString());
                }
            } catch (Throwable t) {
                if (debugOn) {
                    // why kill the server if the exception is not fatal?
                    System.out.println(t.toString());
                }
            }

        }
    }
    public static void main(String[] args) {
        new SynTest();
    }
    private void prepareFile() throws IOException {
        FileOutputStream fos = new FileOutputStream(file);
        for(int i=0;i<100;i++){
            fos.write(("Some text written to file:" + 
(index++)+"\n").getBytes());
        }
        fos.close();
    }

}
//**************************************
// source end
//**************************************


I suspect  that writing to file causes leaving monitor and web server 
can serve pieces of file. But it should be impossible :), especially 
when web server serves different file than just written it is waiting 
for leaving synchronized block.   - just opposite to my requirements

How to block http requests on file I'm woring on and allow others(for 
example small unchangeable images).

Thank you for your help.
rumi
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