org.pentaho.di.ui.repo.RepositorySessionTimeoutHandler.java Source code

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2016 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ******************************************************************************/

package org.pentaho.di.ui.repo;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.List;

import org.apache.commons.lang.ClassUtils;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.repository.IRepositoryService;
import org.pentaho.di.repository.ReconnectableRepository;
import org.pentaho.metastore.api.IMetaStore;

public class RepositorySessionTimeoutHandler implements InvocationHandler {

    private static final String CONNECT_METHOD_NAME = "connect";

    private static final String GET_META_STORE_METHOD_NAME = "getMetaStore";

    private static final String GET_SERVICE_METHOD_NAME = "getService";

    private static final int SERVICE_CLASS_ARGUMENT = 0;

    private final ReconnectableRepository repository;

    private final SessionTimeoutHandler sessionTimeoutHandler;

    private IMetaStore metaStoreInstance;

    public RepositorySessionTimeoutHandler(ReconnectableRepository repository,
            RepositoryConnectController repositoryConnectController) {
        this.repository = repository;
        sessionTimeoutHandler = new SessionTimeoutHandler(repositoryConnectController);
    }

    @SuppressWarnings("unchecked")
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        try {
            String methodName = method.getName();
            if (GET_SERVICE_METHOD_NAME.equals(methodName)) {
                return wrapRepositoryServiceWithTimeoutHandler(
                        (Class<? extends IRepositoryService>) args[SERVICE_CLASS_ARGUMENT]);
            }
            if (GET_META_STORE_METHOD_NAME.equals(methodName)) {
                return metaStoreInstance;
            }
            Object result = method.invoke(repository, args);
            if (CONNECT_METHOD_NAME.equals(methodName)) {
                IMetaStore metaStore = repository.getMetaStore();
                metaStoreInstance = wrapMetastoreWithTimeoutHandler(metaStore, sessionTimeoutHandler);
            }
            return result;
        } catch (InvocationTargetException ex) {
            if (connectedToRepository()) {
                return sessionTimeoutHandler.handle(repository, ex.getCause(), method, args);
            }
            throw ex.getCause();
        }
    }

    boolean connectedToRepository() {
        return repository.isConnected();
    }

    IRepositoryService wrapRepositoryServiceWithTimeoutHandler(Class<? extends IRepositoryService> clazz)
            throws KettleException {
        IRepositoryService service = repository.getService(clazz);
        RepositoryServiceSessionTimeoutHandler timeoutHandler = new RepositoryServiceSessionTimeoutHandler(service,
                sessionTimeoutHandler);
        return wrapObjectWithTimeoutHandler(service, timeoutHandler);
    }

    static IMetaStore wrapMetastoreWithTimeoutHandler(IMetaStore metaStore,
            SessionTimeoutHandler sessionTimeoutHandler) {
        MetaStoreSessionTimeoutHandler metaStoreSessionTimeoutHandler = new MetaStoreSessionTimeoutHandler(
                metaStore, sessionTimeoutHandler);
        return wrapObjectWithTimeoutHandler(metaStore, metaStoreSessionTimeoutHandler);
    }

    @SuppressWarnings("unchecked")
    static <T> T wrapObjectWithTimeoutHandler(T objectToWrap, InvocationHandler timeoutHandler) {
        List<Class<?>> objectIntrerfaces = ClassUtils.getAllInterfaces(objectToWrap.getClass());
        Class<?>[] objectIntrerfacesArray = objectIntrerfaces.toArray(new Class<?>[objectIntrerfaces.size()]);
        return (T) Proxy.newProxyInstance(objectToWrap.getClass().getClassLoader(), objectIntrerfacesArray,
                timeoutHandler);
    }
}