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());
}
}
---------------------
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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