package kg.apc.jmeter.functions;

 import kg.apc.jmeter.modifiers.FifoMap;

 import org.apache.jmeter.engine.util.CompoundVariable;

 import org.apache.jmeter.functions.AbstractFunction;

 import org.apache.jmeter.functions.InvalidVariableException;

 import org.apache.jmeter.samplers.SampleResult;

 import org.apache.jmeter.samplers.Sampler;

 import org.apache.jmeter.threads.JMeterVariables;

 import java.util.Collection;

 import java.util.LinkedList;

 import java.util.List;

 public class FifoSize extends AbstractFunction {

     private static final List<String> desc = new LinkedList<String>();

     private static final String KEY = "__fifoSize";

     static {

         desc.add("FIFO queue name to get elements count");

         desc.add("Name of variable in which to store the result (optional)");

     }

     private Object[] values;

     public FifoSize() {

     }

     @Override

     public synchronized String execute(SampleResult previousResult, Sampler currentSampler)

             throws InvalidVariableException {

         String fifoName = ((CompoundVariable) values[0]).execute();

         int size = FifoMap.getInstance().length(fifoName);

         String value = Integer.toString(size);

         JMeterVariables vars = getVariables();

         if (vars != null && values.length > 1) {

             String varName = ((CompoundVariable) values[1]).execute().trim();

             vars.put(varName, value);

         }

         return value;

     }

     @Override

     public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {

         checkMinParameterCount(parameters, 1);

         values = parameters.toArray();

     }

     @Override

     public String getReferenceKey() {

         return KEY;

     }

     @Override

     public List<String> getArgumentDesc() {

         return desc;

     }

 }