Method Lookup : AOP « Spring « Java

Method Lookup

File: context.xml

<?xml version="1.0" encoding="UTF-8"?>


  <bean id="dataService" class="DataServiceImpl">
    <lookup-method name="getDataDao" bean="dataDao"/>

  <bean id="dataDao" singleton="false"



import java.util.Date;
import java.util.GregorianCalendar;

import org.springframework.context.ApplicationContext;

class Main {
  public static void main(String args[]) throws Exception {
    ApplicationContext ctx = new ClassPathXmlApplicationContext(
    DataService ws = (DataService) ctx.getBean("dataService");

    Double high = ws.getHistoricalHigh(new GregorianCalendar(2004, 0, 1).getTime());
    System.out.println("High was: " + high);

    ws = new DataServiceImpl() {
      protected DataDao getDataDao() {
        return null;

abstract class DataServiceImpl implements DataService {

  protected abstract DataDao getDataDao();

  public Double getHistoricalHigh(Date date) {
    DataData wd = getDataDao().find(date);
    if (wd != null)
      return new Double(wd.getHigh());
    return null;

interface DataService {
  Double getHistoricalHigh(Date date);

class DataData {

  Date date;

  double low;

  double high;
  public Date getDate() {
    return date;

  public void setDate(Date date) { = date;

  public double getLow() {
    return low;

  public void setLow(double low) {
    this.low = low;

  public double getHigh() {
    return high;

  public void setHigh(double high) {
    this.high = high;

interface DataDao {

  DataData find(Date date);

  DataData save(Date date);

  DataData update(Date date);

class StatefulDataDataDaoImpl implements DataDao {

  public DataData find(Date date) {

    DataData wd = new DataData();
    wd.setDate((Date) date.clone());
    return wd;

  public DataData save(Date date) {
    throw new UnsupportedOperationException("This class uses static data only");

  public DataData update(Date date) {
    throw new UnsupportedOperationException("This class uses static data only");

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