org.bpmscript.exec.js.scope.hibernate.HibernateScopeStore.java Source code

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Here is the source code for org.bpmscript.exec.js.scope.hibernate.HibernateScopeStore.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.bpmscript.exec.js.scope.hibernate;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.bpmscript.BpmScriptException;
import org.bpmscript.exec.js.scope.IScopeStore;
import org.bpmscript.js.Global;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.criterion.Expression;
import org.hibernate.criterion.Projections;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.UniqueTag;
import org.mozilla.javascript.serialize.ScriptableInputStream;
import org.mozilla.javascript.serialize.ScriptableOutputStream;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

/**
 * Serialises and stores scopes in a database using Hibernate
 */
public class HibernateScopeStore extends HibernateDaoSupport implements IScopeStore {

    /**
     * @see org.bpmscript.exec.js.scope.IScopeStore#findScope(java.lang.String)
     */
    @SuppressWarnings("unchecked")
    public Scriptable findScope(final Context cx, final String definitionId) throws BpmScriptException {
        try {
            return (Scriptable) getHibernateTemplate().execute(new HibernateCallback() {

                public Object doInHibernate(Session session) throws HibernateException, SQLException {
                    try {
                        Criteria criteria = session.createCriteria(HibernateScope.class);
                        criteria.add(Expression.eq("definitionId", definitionId));
                        criteria.setProjection(Projections.property("scope"));
                        List list = criteria.list();
                        if (list.size() == 0) {
                            return null;
                        }
                        byte[] bytes = (byte[]) list.get(0);
                        Scriptable scope = new Global(cx);
                        ScriptableInputStream in = new ScriptableInputStream(new ByteArrayInputStream(bytes),
                                scope);
                        HashMap<String, Object> serialisedDiff = (HashMap<String, Object>) in.readObject();
                        in.close();
                        for (Map.Entry<String, Object> entry : serialisedDiff.entrySet()) {
                            String key = entry.getKey();
                            Object value = entry.getValue();
                            ScriptableObject.putProperty(scope, key, value);
                        }
                        return scope;
                    } catch (Exception e) {
                        throw new HibernateException(e);
                    }
                }

            });
        } catch (Exception e) {
            throw new BpmScriptException(e);
        }
    }

    /**
     * @see org.bpmscript.exec.js.scope.IScopeStore#storeScope(java.lang.String,
     *      org.mozilla.javascript.Scriptable)
     */
    public void storeScope(Context cx, String processId, Scriptable scope) throws BpmScriptException {
        try {
            ScriptableObject global = new Global(cx);
            HashMap<String, Object> diff = new HashMap<String, Object>();
            Object[] allIds = scope.getIds();
            for (Object id : allIds) {
                if (id != null) {
                    String idString = (String) id;
                    Object object = global.get(idString, global);
                    if (object == UniqueTag.NOT_FOUND) {
                        diff.put(idString, scope.get(idString, scope));
                    }
                }
            }
            ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
            ScriptableOutputStream out = new ScriptableOutputStream(byteOut, scope);
            out.writeObject(diff);
            out.flush();
            out.close();
            byte[] bytes = byteOut.toByteArray();
            getHibernateTemplate().save(new HibernateScope(processId, bytes));
        } catch (Exception e) {
            throw new BpmScriptException(e);
        }
    }

}