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static double[] global_result = new double[N]; public static void main(String[] args) throws InterruptedException { //create and start N threads Thread[] t = new Thread[N]; for (int i = 0; i != N; i++) {t[i] = new Thread(new Worker(i)); t[i] start( ) ; } //wait for all N threads to finish for (int i = 0; i != N; i++){t[i]join();} //print the results for (int i = 0; i!=N; i++) {Systemoutprint(global_result[i] + " ");} Systemoutprintln("done"); } static class Worker implements Runnable { double local_result; int i; int ID; Worker(int ID){thisID = ID;} //main work of threads public void run() { //perform the main computation local_result = big_computation(ID, i); //update global variables in synchronized block synchronized(thisgetClass()) {consume_results(ID, local_result, global_result);} } //define computation double big_computation(int ID, int i){ } //define result update void consume_results(int ID, double local_result, double[] global_result){ } }

SystemsetSecurityManager ( new RMISecurityManager() );

public class DeleteTool extends AdminTool { public DeleteTool(String domainName) { super(domainName); } @Override void doInvoke() { simpleDbdeleteDomain(domain); Systemoutprintln("Domain deleted: " + domain); } }

It is implicitly synchronized on this for normal methods and the class object for static methods This approach moves the responsibility for synchronization from the threads accessing the shared data structure to the data structure itself Often this is a better engineered approach In Fig 69, the previous example is rewritten to use this approach Now the global_result variable is encapsulated in the Example2 class and marked private to help enforce this (To make the point, the Worker class is no longer a nested class) The only way for the workers to access the global_result array is through the consume_results method, which is now a synchronized method in the Example2 class Thus, the responsibility for synchronization has been moved from

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Basically, it excludes access to resources unless specific permission is given to grant access By specifying a security policy, you can override these settings and assign new permissions for networking security The idea of a policy file makes sense it gives fine-grained control over security settings and forces system administrators and users to consider carefully what types of access are being given (as opposed to granting universal access and then excluding or restricting certain types of access) It's easy to forget to exclude some feature, and forcing a system to specify only the permissions it needs will help to prevent a backdoor to the system being left open The format of the security policy file is specified in the Java 2 security documents, but for most RMI applications, a policy file like the following will suffice It grants permission to bind to a TCP port above 1024, but leaves privileged ports for well-known protocols (such as HTTP/FTP) unavailable, to prevent rogue code from masquerading as a legitimate server It also grants limited file read access to the c:\rmi directory, and grants write access to the c:\rmi\data directory By convention, double slash characters ("\") are used as a path separator on Windows systems For other operating systems such as Unix, an alternate file separator will be used, such as "/" Code for rmipolicy

Grant { permission javanetSocketPermission "*:1024-65535", "accept, connect, listen, resolve"; permission javanetSocketPermission "*:1-1023", "connect, resolve"; permission javaioFilePermission "c:\\rmi\\", "read"; permission javaioFilePermission "c:\\rmi\\data\\", "write"; }

public class Example2 { static final int N = 10; private static double[] global_result = new double[N]; public static void main(String[] args) throws InterruptedException { //create and start N threads Thread[] t = new Thread[N] ; for (int i = 0; i != N; i++) {t[i] = new Thread(new Worker(i)); t[i] start( ) ; } //wait for all threads to terminate for (int i = 0; i != N; i++){t[i] join( ) ;} //print results for (int i = 0; i!=N; i++) {Systemoutprint(global_result[i] + " ");} Systemoutprintln("done"); } //synchronized method serializing consume_results method synchronized static void consume_results(int ID, double local_result) { globalresult[ID] = }

The only difference between the DeleteTool class and the CreateTool class is the call to the SimpleDB library s deleteDomain() method and the text of the console message

NOTE Further information on the format of policy files can be found in the Java 2 Security Guide, http://javasuncom/products/jdk/12/docs/guide/security/indexhtml

class Worker implements Runnable { double local_result; int i; int ID; Worker(int ID){thisID = ID;} public void run() { //perform the main computation local_result = big_computation(ID, i); //carry out the UE's work //invoke method to update results Example2consume_results(ID, local_result);

With all the high-level considerations addressed, that wraps up the design discussionWhat remains is to take the interface defined in Listing 10-1 and flesh it out into the implementation code

To specify a security policy when running RMI software, the system policy javasecuritypolicy is set; this points to the file location of the policy For example, to specify the rmipolicy file discussed earlier for an RMI client, the following command would be used:

//define computation double big_computation(int ID, int i){ }

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