Examples of org.milyn.javabean.context.BeanContext

org.milyn.javabean.context.BeanContext
Bean Context
This class represents a context of bean's and the means to get and set there instances.
This class uses a {@link BeanIdStore} to optimize the access performance. Ifall the {@link BeanId} objects are registered with the BeanIdStore before this objectis created then you get 'direct access' performance.
For performance reasons it is best to register all BeanId objects up front. Because if new BeanId objects are registered after the BeanContext is created then the BeanContext needs to do synchronize with the BeanIdStore,
It is possible to get the bean by it's bean id String name. However this isn't as fast as using the BeanId objects. @author maurice.zeijen@smies.com

            wireObject(executionContext);
        }




    private void wireObject(ExecutionContext executionContext) {
      BeanContext beanContext = executionContext.getBeanContext();
            Map<String, Object> beanMap = beanContext.getBeanMap();
            Object key = keyExtractor.getValue(beanMap);


            @SuppressWarnings("unchecked") //TODO: Optimize to use the BeanId object
            Map<Object, Object> map =  (Map<Object, Object>) beanContext.getBean(mapBindingKey);
            Object record = beanContext.getBean(RECORD_BEAN);


            map.put(key, record);
        }

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        executionContext.getBeanContext().addBean(bindTo, serializedFragment, new Fragment(element));
  }


    private void notifyStartBean(Fragment source, ExecutionContext executionContext) {
        BeanContext beanContext = executionContext.getBeanContext();


        beanContext.notifyObservers(new BeanContextLifecycleEvent(executionContext,
                source, BeanLifecycle.START_FRAGMENT, beanContext.getBeanId(bindTo), ""));
    }

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  private void executeSQL(ExecutionContext executionContext, Fragment source) throws SmooksException {
        Connection connection = AbstractDataSource.getConnection(datasource, executionContext);
        BeanContext beanContext = executionContext.getBeanContext();


        Map<String, Object> beanMap = beanContext.getBeanMap();


        try {
            if(!statementExec.isJoin()) {
                if(statementExec.getStatementType() == StatementType.QUERY) {
                    if(resultSetScope == ResultSetScope.EXECUTION) {
                        beanContext.addBean(resultSetBeanId, statementExec.executeUnjoinedQuery(connection), source);
                    } else {
                        List<Map<String, Object>> resultMap;
                        // Cached in the application context...
                        ApplicationContext appContext = executionContext.getContext();
                        ResultSetContextObject rsContextObj = ResultSetContextObject.getInstance(rsAppContextKey, appContext);


                        if(rsContextObj.hasExpired()) {
                            synchronized (rsContextObj) {
                                if(rsContextObj.hasExpired()) {
                                    rsContextObj.resultSet = statementExec.executeUnjoinedQuery(connection);
                                    rsContextObj.expiresAt = System.currentTimeMillis() + resultSetTTL;
                                }
                            }
                        }
                        resultMap = rsContextObj.resultSet;
                        beanContext.addBean(resultSetBeanId, resultMap, source);
                    }
                } else {
                    statementExec.executeUnjoinedUpdate(connection);
                }
            } else {
                if(statementExec.getStatementType() == StatementType.QUERY) {
                    List<Map<String, Object>> resultMap = new ArrayList<Map<String, Object>>();
                    statementExec.executeJoinedQuery(connection, beanMap, resultMap);
                    beanContext.addBean(resultSetBeanId, resultMap, source);
                } else {
                    if(resultSetBeanId == null) {
                        statementExec.executeJoinedUpdate(connection, beanMap);
                    } else {
                        Object resultSetObj = beanContext.getBean(resultSetBeanId);
                        if(resultSetObj != null) {
                            try {
                              @SuppressWarnings("unchecked")
                                List<Map<String, Object>> resultSet = (List<Map<String, Object>>) resultSetObj;
                                statementExec.executeJoinedStatement(connection, resultSet);

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            logger.info("attributes.getQName(" + n + ") == " + attributes.getQName(n));
            logger.info("attributes.getType(" + n + ") == " + attributes.getType(n));
            logger.info("attributes.getValue(" + n + ") == " + attributes.getValue(n));
          }


          BeanContext beans = execution.getBeanContext();
          assertNotNull(beans);


          Data data = (Data) beans.getBean("Data");
          assertNotNull(data);


          logger.info("data.getNumber() == " + data.getNumber());
          logger.info("data.getTruncated() == " + data.getTruncated());

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          exception += "query '" + query + "'";
        }
        throw new NoLookupResultException(exception);
      }


      BeanContext beanContext = executionContext.getBeanContext();


      if(result == null) {
        beanContext.removeBean(beanId, source);
      } else {
        beanContext.addBean(beanId, result, source);
      }
    } finally {
      if(dao != null) {
        emr.returnDao(dao);
      }

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            wireObject(executionContext);
        }




    private void wireObject(ExecutionContext executionContext) {
            BeanContext beanContext = executionContext.getBeanContext();
            Map<String, Object> beanMap = beanContext.getBeanMap();
            Object key = keyExtractor.getValue(beanMap);


            @SuppressWarnings("unchecked") //TODO: Optimize to use the BeanId object
            Map<Object, Object> map =  (Map<Object, Object>) beanContext.getBean(mapBindingKey);
            Object record = beanContext.getBean(RECORD_BEAN);


            map.put(key, record);
        }

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      throws SmooksException {
    selectRow(executionContext, new Fragment(element));
  }


    private void selectRow(ExecutionContext executionContext, Fragment source) throws SmooksException {
      BeanContext beanRepository = executionContext.getBeanContext();


      Map<String, Object> beanMapClone = new HashMap<String, Object>(beanRepository.getBeanMap());


        // Lookup the new current value for the bean...
        try {
          @SuppressWarnings("unchecked")
            List<Map<String, Object>> resultSet = (List<Map<String, Object>>) beanRepository.getBean(resultSetBeanId);


            if(resultSet == null) {
                throw new SmooksException("Resultset '" + resultSetName + "' not found in bean context.  Make sure an appropriate SQLExecutor resource config wraps this selector config.");
            }


            try {
              Object selectedRow = null;


              Iterator<Map<String, Object>> resultIter = resultSet.iterator();
                while (selectedRow == null && resultIter.hasNext()) {
                  Map<String, Object> row = resultIter.next();


                  beanMapClone.put("row", row);


                    if(whereEvaluator.eval(beanMapClone)) {
                      selectedRow = row;
                      beanRepository.addBean(beanIdObj, selectedRow, source);
                    }
                }


                if(selectedRow == null && failedSelectError != null) {
                    throw new DataSelectionException(failedSelectError.apply(beanRepository.getBeanMap()));
                }


                if(logger.isDebugEnabled()) {
                    logger.debug("Selected resultset where '" + whereEvaluator.getExpression() + "': [" + selectedRow + "].");
                }
            } catch(ClassCastException e) {
                throw new SmooksException("Bean '" + resultSetName + "' cannot be used as a Reference Data resultset.  The resultset List must contain entries of type Map<String, Object>.");
            }
        } catch(ClassCastException e) {
            throw new SmooksException("Bean '" + resultSetName + "' cannot be used as a Reference Data resultset.  A resultset must be of type List<Map<String, Object>>. '" + resultSetName + "' is of type '" + beanRepository.getBean(resultSetBeanId).getClass().getName() + "'.");
        }
    }

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    if(logger.isDebugEnabled()) {
      logger.debug("Deleting bean under BeanId '" + beanIdName + "' with DAO '" + daoName + "'");
    }


    BeanContext beanContext = executionContext.getBeanContext();


    Object bean = beanContext.getBean(beanId);


    final DaoRegister emr = PersistenceUtil.getDAORegister(executionContext);


    Object dao = null;
    try {
      if(daoName == null) {
        dao = emr.getDefaultDao();
      } else {
        dao = emr.getDao(daoName);
      }


      if(dao == null) {
        String msg = "The DAO register returned null while getting the ";


        if(daoName == null) {
          msg += "default DAO";
        } else {
          msg += "DAO '" + daoName + "'";
        }


        throw new NullPointerException(msg);
      }


      DaoInvoker daoInvoker = DaoInvokerFactory.getInstance().create(dao, objectStore);


      Object result = (name != null) ? daoInvoker.delete(name, bean) : daoInvoker.delete(bean);


      if(deletedBeanId != null) {
        if(result == null) {
          result = bean;
        }
        beanContext.addBean(deletedBeanId, result, source);
      } else if(result != null && bean != result) {
        beanContext.changeBean(beanId, bean, source);
      }




    } finally {
      if(dao != null) {

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        beanContext.notifyObservers(new BeanContextLifecycleEvent(executionContext,
                source, BeanLifecycle.START_FRAGMENT, beanContext.getBeanId(bindTo), ""));
    }


    public void executeVisitLifecycleCleanup(Fragment fragment, ExecutionContext executionContext) {
        BeanContext beanContext = executionContext.getBeanContext();
        BeanId beanId = beanContext.getBeanId(bindTo);
        Object bean = beanContext.getBean(beanId);


        beanContext.notifyObservers(new BeanContextLifecycleEvent(executionContext, fragment, BeanLifecycle.END_FRAGMENT, beanId, bean));
        if(!retain) {
            executionContext.getBeanContext().removeBean(beanId, null);
        }
    }

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      }
      
      ExecutionContext executionContext = event.getExecutionContext();
      populator.populateAndSetPropertyValue(bean, executionContext.getBeanContext(), watchingBeanId, executionContext, event.getSource());
    } else if(beanId == watchingBeanId && lifecycle == BeanLifecycle.REMOVE) {
      BeanContext beanContext = event.getExecutionContext().getBeanContext();
      
      beanContext.removeObserver(this);
      // Need to remove the watched bean from the bean context too because it's lifecycle is associated 
      // with the lifecycle of the watching bean, which has been removed...
      if(watchedBeanId != null) {
        beanContext.removeBean(watchedBeanId, event.getSource());
      }
    }
  }

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