Source Code : Keyed Object Pool

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Keyed Object Pool

import org.apache.commons.pool.impl.GenericKeyedObjectPool;

public class TestKeyedObjectPool {

  public static void main(String args[]) throws Exception {

    GenericKeyedObjectPool pool = new GenericKeyedObjectPool();
    pool.setFactory(new SkilledEmployeeFactory());

    pool.addObject("Java");
    pool.addObject("Java");
    pool.addObject("VB");
    pool.addObject("C++");

    System.err.println("Number of Java employees in pool: " +
      pool.getNumIdle("Java") + " out of total employees: " +
      pool.getNumIdle());

    Employee employee = (Employee)pool.borrowObject("Java");

    employee.doWork();

    System.err.println("Employee: "  + employee);

    pool.returnObject("Java", employee);

    System.err.println("Number of Java employees in pool: " +
      pool.getNumIdle("Java") + " out of total employees: " +
      pool.getNumIdle());
  }
}

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public class Employee {

  private static int base = 0;


  private int id;

  private String name;

  public Employee() {
    this.id = base++;
  }

  public int getId() {
    return this.id;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public void doWork() {
    // does nothing
  }

  public String toString() {
    return ("Id: " + this.id + ", Name: " + this.name);
  }

  public void finalize() {
    System.err.println("Employee " + toString() + " made redundant");
  }
}

--------------------

import org.apache.commons.pool.BaseKeyedPoolableObjectFactory;

public class SkilledEmployeeFactory extends BaseKeyedPoolableObjectFactory {

  public Object makeObject(Object key) {
    if(key == null || !(key instanceof String) || ((String)key).length() == 0)
      throw new IllegalArgumentException("Invalid key specified");
    return new SkilledEmployee(key.toString());
  }

  /*public boolean validateObject(Object key, Object obj) {
    if(obj instanceof Employee) {
      if(((Employee)obj).getName() == null)
        return true;
    }
    return false;
  }

  public void passivateObject(Object obj) throws Exception {
    if(obj instanceof Employee) {
      ((Employee)obj).setName(null);
    } else throw new Exception("Unknown object");
  }*/
}

-------------------------

public class SkilledEmployee extends Employee {

  private String skill;

  public SkilledEmployee(String skill) {
    this.skill = skill;
  }

  public String getSkill() {
    return this.skill;
  }

  public String toString() {
    return getSkill() + " -- " + getName();
  }
}
           
       

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