Using transactions and statistics

The Javadoc for the test execution services interfaces and classes can be accessed from the product by clicking Help > Help Contents > IBM Rational Performance TesterAPI Reference.

The following code shows how to start a transaction. Transactions that are generated by test execution services automatically create and manage statistics.

package customcode;

import com.ibm.rational.test.lt.kernel.services.ITestExecutionServices;
import com.ibm.rational.test.lt.kernel.services.ITransaction;

/** 
 * @author IBM Custom Code Samples
 */ 
public class BeginTransaction implements
		com.ibm.rational.test.lt.kernel.custom.ICustomCode2 {

	/** 	
	 * Instances of this will be created using the no-arg constructor. 	
	 */ 
	public BeginTransaction() { 	
	}  	

	/** 	
	 * For Javadoc information on the ICustomCode2 and ITestExecutionServices interfaces, 	
	 * see the 'Test execution services interfaces and classes' help topic. 	
	 */ 	
	public String exec(ITestExecutionServices tes, String[] args) { 		
		// the name of the transaction could have been passed in via data correlation mechanism. 		
		ITransaction foo = tes.getTransaction("foo"); 		
		foo.start(); 		
		return null; 
	}  
}

The following code shows how to gather additional statistics during a transaction.

package customcode;

import com.ibm.rational.test.lt.kernel.ITime;
import com.ibm.rational.test.lt.kernel.services.ITestExecutionServices;
import com.ibm.rational.test.lt.kernel.statistics.IScalar;
import com.ibm.rational.test.lt.kernel.statistics.IStat;
import com.ibm.rational.test.lt.kernel.statistics.IStatTree;
import com.ibm.rational.test.lt.kernel.statistics.impl.StatType;

/**
 * @author IBM Custom Code Samples
 */
public class BodyTransaction implements
		com.ibm.rational.test.lt.kernel.custom.ICustomCode2 {

	/**
	 * Instances of this will be created using the no-arg constructor.
	 */
	public BodyTransaction() {
	}

	/** 	
	 * For Javadoc information on the ICustomCode2 and ITestExecutionServices interfaces, 	
	 * see the 'Test execution services interfaces and classes' help topic. 	
	 */ 	
	public String exec(ITestExecutionServices tes, String[] args) {
		IStatTree tranStat;
		IStatTree timeStat;
		IStatTree countStat;
		
		IStat timeDataStat = null;		// counter for the time RANGE
		IScalar countDataStat = null;	// counter for the count SCALAR
		
		ITime timer = tes.getTime();
		
        IStatTree rootStat = tes.getStatisticsManager().getStatTree();
        if (rootStat != null) {
        	// these counters set up the hierarchy
        	tranStat = rootStat.getStat("Transactions", StatType.STRUCTURE);
        	timeStat = tranStat.getStat("Body Time", StatType.STRUCTURE);
        	countStat = tranStat.getStat("Bocy Count", StatType.STRUCTURE);
        
        	// the name of the counters could have been passed in via data correlation mechanism
        	timeDataStat = (IStat) timeStat.getStat("foo", StatType.RANGE);
        	countDataStat = (IScalar) countStat.getStat("foo", StatType.SCALAR);
        }

        // get the start time
        long startTime = timer.timeInTest();
        
        // do the work
        // whatever that work might be
        
        // get the end time
        long endTime = timer.timeInTest();
        
        // update timeDataStat with the elapsed time
        if (timeDataStat != null)
        	timeDataStat.submitDataPoint(endTime - startTime);
        
        // update the countDataStat
        if (countDataStat != null)
        	countDataStat.increment();
        
		return null;
	}

}

The following code shows how to stop a transaction.

package customcode;

import com.ibm.rational.test.lt.kernel.services.ITestExecutionServices;
import com.ibm.rational.test.lt.kernel.services.ITransaction;

/**
 * @author IBM Custom Code Samples
 */
public class EndTransaction implements
		com.ibm.rational.test.lt.kernel.custom.ICustomCode2 {

	/**
	 * Instances of this will be created using the no-arg constructor.
	 */
	public EndTransaction() {
	}

	/** 	
	 * For Javadoc information on the ICustomCode2 and ITestExecutionServices interfaces, 	
	 * see the 'Test execution services interfaces and classes' help topic. 	
	 */ 	
	public String exec(ITestExecutionServices tes, String[] args) {
		// the name of the transaction could have been passed in via data correlation mechanism.
		ITransaction foo = tes.getTransaction("foo");
		foo.stop();
		return null;
	}

}