org.springframework.batch.test.DataSourceInitializer.java Source code

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Here is the source code for org.springframework.batch.test.DataSourceInitializer.java

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/*
 * 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.springframework.batch.test;

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

import javax.sql.DataSource;

import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.support.ClassPathXmlApplicationContext;
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.ClassUtils;
import org.springframework.util.StringUtils;

/**
 * Wrapper for a {@link DataSource} that can run scripts on start up and shut
 * down.  Us as a bean definition <br><br>
 * 
 * Run this class to initialize a database in a running server process.
 * Make sure the server is running first by launching the "hsql-server" from the
 * <code>hsql.server</code> project. Then you can right click in Eclipse and
 * Run As -&gt; Java Application. Do the same any time you want to wipe the
 * database and start again.
 * 
 * @author Dave Syer
 * 
 */
public class DataSourceInitializer implements InitializingBean, DisposableBean {

    private static final Log logger = LogFactory.getLog(DataSourceInitializer.class);

    private Resource[] initScripts;

    private Resource[] destroyScripts;

    private DataSource dataSource;

    private boolean ignoreFailedDrop = true;

    private boolean initialized = false;

    /**
     * Main method as convenient entry point.
     * 
     * @param args
     */
    @SuppressWarnings("resource")
    public static void main(String... args) {
        new ClassPathXmlApplicationContext(ClassUtils.addResourcePathToPackagePath(DataSourceInitializer.class,
                DataSourceInitializer.class.getSimpleName() + "-context.xml"));
    }

    @Override
    public void destroy() {
        if (destroyScripts == null)
            return;
        for (int i = 0; i < destroyScripts.length; i++) {
            Resource destroyScript = destroyScripts[i];
            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 + "]");
                }
            }
        }
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Assert.notNull(dataSource);
        initialize();
    }

    private void initialize() {
        if (!initialized) {
            destroy();
            if (initScripts != null) {
                for (int i = 0; i < initScripts.length; i++) {
                    Resource initScript = initScripts[i];
                    doExecuteScript(initScript);
                }
            }
            initialized = true;
        }
    }

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

            @Override
            public Void 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<String> list) {
        StringBuilder buffer = new StringBuilder();
        for (String line : list) {
            if (!line.startsWith("//") && !line.startsWith("--")) {
                buffer.append(line).append("\n");
            }
        }
        return buffer.toString();
    }

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

    public void setDestroyScripts(Resource[] destroyScripts) {
        this.destroyScripts = destroyScripts;
    }

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

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

}