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From sma...@irit.fr
Subject Re: spl policy
Date Thu, 17 Sep 2009 23:25:41 GMT
> Hi

 please can you help me, to write the syntax of policy for this example

 I need it for today

 thank you
> smaili,
>
> Welcome to the policy world!
>
> Regarding your questions about how to use Imperius to create policy-based
> applications, I would like to explain to you by walking you through a
> concrete example that uses your scenario.
>
> In a policy managed environment, you should have sensors that collect
> information from your managed system and effectors that execute actions
> when your policy is enforced.
>
> In you scenario, sensors and effectors can be combined in an anchor class,
> PollingOperation.java as shown below. This class does both of information
> collection and action execution. In addition, you also need to write a
> policy which describes your control logical, please see Policy given
> below.
>
> Once you have these components in place, you need to write your
> application
> that uses Imperius Policy Engine to evaluate your conditions and take
> actions accordingly.
>
> You should see the following messages when you execute the Manager.java.
>
> ***********DeletePolicy : dummy***********
> ***********DeletePolicy complete***********
> ***********CreatePolicy : dummy***********
> ***********CreatePolicy complete***********
> Policy Created : dummy true
>
> Execution Result is 1
>
> I hope I have answered your questions.
>
> Xiping
> IBM T.J. Watson Research Center
>
>
>
> =============================================================================================================
>
> 1) Anchor class PollingOperation
>
> package com.abdel;
>
> public class PollingOperation {
>       public static int POLLING_OPERATION = 1;
>       public static int PUSHING_OPERATION = 2;
>
>       private int operation = POLLING_OPERATION;
>       private int numOfOperations;
>       private int pollingInterval;
>
>       public void setCurOperation(int op) {
>             this.operation = op;
>       }
>
>       public PollingOperation(int interval, int numOfOperations) {
>             this.pollingInterval = interval;
>             this.numOfOperations = numOfOperations;
>       }
>
>       public int getCurOperation() {
>             return this.operation;
>       }
>
>       public void setNumOfOperation(int num) {
>             this.numOfOperations = num;
>       }
>
>       public int getNumberOfOperations() {
>             return this.numOfOperations;
>       }
>
>       public void changePollingInterval(int delta) {
>             this.pollingInterval += delta;
>       }
> }
>
> 2) Policy
>
> Import Class com.abdel.PollingOperation:pop;
> Strategy Execute_All_Applicable;
> Policy {
>       Declaration {
>             pollingOp = 1;
>             threshold = 10;
>             delta = 5;
>       }
>       Condition {
>             pop.getCurOperation() == pollingOp &&
>             pop.getNumberOfOperations() > threshold
>       }
>       Decision {
>             pop.changePollingInterval(delta)
>       }
> }:1;
>
> 3) Application
>
> package com.abdel;
>
> import java.io.DataInputStream;
> import java.io.FileInputStream;
> import java.io.IOException;
> import java.util.Hashtable;
> import java.util.Map;
>
> import org.apache.imperius.javaspl.Java_SPLPolicyRuleProvider;
> import org.apache.imperius.spl.parser.exceptions.SPLException;
>
> public class Manager {
>
>       public static void main(String[] args) throws SPLException,
> IOException {
>
>             if (args.length != 1) {
>                   System.out.println("Usage: Manager <policy>");
>                   System.exit(0);
>             }
>
>             // read in policy
>             DataInputStream dis = new DataInputStream(new FileInputStream
> (args[0]));
>             StringBuffer sb = new StringBuffer();
>             String s = null;
>             while ((s = dis.readLine()) != null) {
>                   sb.append(s+"\n");
>             }
>
>             // setup
>             Map objMap = new Hashtable();
>             PollingOperation pop = new PollingOperation(5, 11);
>             objMap.put("pop", pop);
>
>
>             Java_SPLPolicyRuleProvider jspl = Java_SPLPolicyRuleProvider.
> getInstance();
>             String policyName = "dummy";
>
>             // delete policy if exists
>             try {
>                   jspl.deletePolicy(policyName);
>             } catch(Exception e) { }
>
>             // create policy
>             boolean createReturn = jspl.createPolicy("dummy", sb.toString
> ());
>             System.out.println("Policy Created : " + policyName + " " +
> createReturn);
>             System.out.println("");
>
>             // evaluate policy
>             Object result = jspl.executePolicy(policyName, objMap);
>             System.out.println("Execution Result is " + result);
>
>       }
> }
>


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