org.works.common.data.layer.datasource.InitializingDataSourceFactoryBean.java Source code

Introduction

Here is the source code for org.works.common.data.layer.datasource.InitializingDataSourceFactoryBean.java

Source

/*
 * Copyright 2006-2007 the original author or authors.
 * 
 * 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.works.common.data.layer.datasource;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.sql.DataSource;

import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.core.io.Resource;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallback;
import org.springframework.transaction.support.TransactionTemplate;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

public class InitializingDataSourceFactoryBean extends AbstractFactoryBean {

    private Resource[] initScripts;

    private Resource destroyScript;

    private DataSource dataSource;

    private boolean ignoreFailedDrop = true;

    private static boolean initialized = false;

    /**
     * @throws Throwable
     * @see java.lang.Object#finalize()
     */
    protected void finalize() throws Throwable {
        super.finalize();
        initialized = false;
        logger.debug("finalize called");
    }

    protected void destroyInstance(Object instance) throws Exception {
        try {
            doExecuteScript(destroyScript);
        } catch (Exception e) {
            if (logger.isDebugEnabled()) {
                logger.warn("Could not execute destroy script [" + destroyScript + "]", e);
            } else {
                logger.warn("Could not execute destroy script [" + destroyScript + "]");
            }
        }
    }

    public void afterPropertiesSet() throws Exception {
        Assert.notNull(dataSource);
        super.afterPropertiesSet();
    }

    protected Object createInstance() throws Exception {
        Assert.notNull(dataSource);
        if (!initialized) {
            try {
                doExecuteScript(destroyScript);
            } catch (Exception e) {
                logger.debug("Could not execute destroy script [" + destroyScript + "]", e);
            }
            if (initScripts != null) {
                for (int i = 0; i < initScripts.length; i++) {
                    Resource initScript = initScripts[i];
                    doExecuteScript(initScript);
                }
            }
            initialized = true;
        }
        return dataSource;
    }

    private void doExecuteScript(final Resource scriptResource) {
        if (scriptResource == null || !scriptResource.exists())
            return;
        TransactionTemplate transactionTemplate = new TransactionTemplate(
                new DataSourceTransactionManager(dataSource));
        transactionTemplate.execute(new TransactionCallback() {

            public Object doInTransaction(TransactionStatus status) {
                JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
                String[] scripts;
                try {
                    scripts = StringUtils.delimitedListToStringArray(
                            stripComments(IOUtils.readLines(scriptResource.getInputStream())), ";");
                } catch (IOException e) {
                    throw new BeanInitializationException("Cannot load script from [" + scriptResource + "]", e);
                }
                for (int i = 0; i < scripts.length; i++) {
                    String script = scripts[i].trim();
                    if (StringUtils.hasText(script)) {
                        try {
                            jdbcTemplate.execute(script);
                        } catch (DataAccessException e) {
                            if (ignoreFailedDrop && script.toLowerCase().startsWith("drop")) {
                                logger.debug("DROP script failed (ignoring): " + script);
                            } else {
                                throw e;
                            }
                        }
                    }
                }
                return null;
            }

        });

    }

    private String stripComments(List list) {
        StringBuffer buffer = new StringBuffer();
        for (Iterator iter = list.iterator(); iter.hasNext();) {
            String line = (String) iter.next();
            if (!line.startsWith("//") && !line.startsWith("--")) {
                buffer.append(line + "\n");
            }
        }
        return buffer.toString();
    }

    public Class getObjectType() {
        return DataSource.class;
    }

    public void setInitScript(Resource initScript) {
        this.initScripts = new Resource[] { initScript };
    }

    public void setInitScripts(Resource[] initScripts) {
        this.initScripts = initScripts;
    }

    public void setDestroyScript(Resource destroyScript) {
        this.destroyScript = destroyScript;
    }

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    public void setIgnoreFailedDrop(boolean ignoreFailedDrop) {
        this.ignoreFailedDrop = ignoreFailedDrop;
    }

}