com.github.trang.druid.autoconfigure.datasource.init.DruidDataSourceInitializer Maven / Gradle / Ivy

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package com.github.trang.druid.autoconfigure.datasource.init;

import com.github.trang.druid.autoconfigure.DruidDataSourceInitializerAutoConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.autoconfigure.jdbc.DataSourceInitializedEvent;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.config.ResourceNotFoundException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.config.SortedResourcesFactoryBean;
import org.springframework.jdbc.datasource.init.DatabasePopulatorUtils;
import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
import org.springframework.util.StringUtils;

import javax.annotation.PostConstruct;
import javax.sql.DataSource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Bean to handle {@link DataSource} initialization by running {@literal schema-*.sql} on
 * {@link PostConstruct} and {@literal data-*.sql} SQL scripts on a
 * {@link DataSourceInitializedEvent}.
 *
 * @author Dave Syer
 * @author Phillip Webb
 * @author Eddú Meléndez
 * @author Stephane Nicoll
 * @author Kazuki Shimizu
 * @since 1.1.0
 * @see DruidDataSourceInitializerAutoConfiguration
 */
public class DruidDataSourceInitializer implements ApplicationListener {

    private static final Logger logger = LoggerFactory.getLogger(DruidDataSourceInitializer.class);

    private final DataSourceProperties properties;

    private final ApplicationContext applicationContext;

    private DataSource dataSource;

    private boolean initialized = false;

    public DruidDataSourceInitializer(DataSourceProperties properties,
                                      ApplicationContext applicationContext) {
        this.properties = properties;
        this.applicationContext = applicationContext;
    }

    @PostConstruct
    public void init() {
        if (!this.properties.isInitialize()) {
            logger.debug("Initialization disabled (not running DDL scripts)");
            return;
        }
        if (this.applicationContext.getBeanNamesForType(DataSource.class, false,
                false).length > 0) {
            this.dataSource = this.applicationContext.getBean(DataSource.class);
        }
        if (this.dataSource == null) {
            logger.debug("No DataSource found so not initializing");
            return;
        }
        runSchemaScripts();
    }

    private void runSchemaScripts() {
        List scripts = getScripts("spring.datasource.schema",
                this.properties.getSchema(), "schema");
        if (!scripts.isEmpty()) {
            String username = this.properties.getSchemaUsername();
            String password = this.properties.getSchemaPassword();
            runScripts(scripts, username, password);
            try {
                this.applicationContext
                        .publishEvent(new DataSourceInitializedEvent(this.dataSource));
                // The listener might not be registered yet, so don't rely on it.
                if (!this.initialized) {
                    runDataScripts();
                    this.initialized = true;
                }
            } catch (IllegalStateException ex) {
                logger.warn("Could not send event to complete DataSource initialization ("
                        + ex.getMessage() + ")");
            }
        }
    }

    @Override
    public void onApplicationEvent(DataSourceInitializedEvent event) {
        if (!this.properties.isInitialize()) {
            logger.debug("Initialization disabled (not running data scripts)");
            return;
        }
        // NOTE the event can happen more than once and
        // the event datasource is not used here
        if (!this.initialized) {
            runDataScripts();
            this.initialized = true;
        }
    }

    private void runDataScripts() {
        List scripts = getScripts("spring.datasource.data",
                this.properties.getData(), "data");
        String username = this.properties.getDataUsername();
        String password = this.properties.getDataPassword();
        runScripts(scripts, username, password);
    }

    private List getScripts(String propertyName, List resources,
                                      String fallback) {
        if (resources != null) {
            return getResources(propertyName, resources, true);
        }
        String platform = this.properties.getPlatform();
        List fallbackResources = new ArrayList();
        fallbackResources.add("classpath*:" + fallback + "-" + platform + ".sql");
        fallbackResources.add("classpath*:" + fallback + ".sql");
        return getResources(propertyName, fallbackResources, false);
    }

    private List getResources(String propertyName, List locations,
                                        boolean validate) {
        List resources = new ArrayList();
        for (String location : locations) {
            for (Resource resource : doGetResources(location)) {
                if (resource.exists()) {
                    resources.add(resource);
                } else if (validate) {
                    throw new ResourceNotFoundException(propertyName, resource);
                }
            }
        }
        return resources;
    }

    private Resource[] doGetResources(String location) {
        try {
            SortedResourcesFactoryBean factory = new SortedResourcesFactoryBean(
                    this.applicationContext, Collections.singletonList(location));
            factory.afterPropertiesSet();
            return factory.getObject();
        } catch (Exception ex) {
            throw new IllegalStateException("Unable to load resources from " + location,
                    ex);
        }
    }

    private void runScripts(List resources, String username, String password) {
        if (resources.isEmpty()) {
            return;
        }
        ResourceDatabasePopulator populator = new ResourceDatabasePopulator();
        populator.setContinueOnError(this.properties.isContinueOnError());
        populator.setSeparator(this.properties.getSeparator());
        if (this.properties.getSqlScriptEncoding() != null) {
            populator.setSqlScriptEncoding(this.properties.getSqlScriptEncoding().name());
        }
        for (Resource resource : resources) {
            populator.addScript(resource);
        }
        DataSource dataSource = this.dataSource;
        if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
            dataSource = DataSourceBuilder.create(this.properties.getClassLoader())
                    .driverClassName(this.properties.determineDriverClassName())
                    .url(this.properties.determineUrl()).username(username)
                    .password(password).build();
        }
        DatabasePopulatorUtils.execute(populator, dataSource);
    }

}