聊聊PowerJob的StoreStrategy

序

本文主要研究一下PowerJob的StoreStrategy

StoreStrategy

tech/powerjob/worker/common/constants/StoreStrategy.java

@Getter
@AllArgsConstructor
public enum  StoreStrategy {

    DISK("磁盘"),
    MEMORY("内存");

    private final String des;
}

StoreStrategy枚举定义了DISK、MEMORY两个枚举

ConnectionFactory

tech/powerjob/worker/persistence/ConnectionFactory.java

@Slf4j
public class ConnectionFactory {

    private volatile DataSource dataSource;

    private final String H2_PATH = PowerFileUtils.workspace() + "/h2/" + CommonUtils.genUUID() + "/";
    private final String DISK_JDBC_URL = String.format("jdbc:h2:file:%spowerjob_worker_db;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false", H2_PATH);
    private final String MEMORY_JDBC_URL = String.format("jdbc:h2:mem:%spowerjob_worker_db;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false", H2_PATH);

    public Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    public synchronized void initDatasource(StoreStrategy strategy) {

        // H2 兼容性问题较多，前置输出版本方便排查
        log.info("[PowerDatasource] H2 database version: {}", JavaUtils.determinePackageVersion(Driver.class));

        // 兼容单元测试，否则没办法单独测试 DAO 层了
        strategy = strategy == null ? StoreStrategy.DISK : strategy;

        HikariConfig config = new HikariConfig();
        config.setDriverClassName(Driver.class.getName());
        config.setJdbcUrl(strategy == StoreStrategy.DISK ? DISK_JDBC_URL : MEMORY_JDBC_URL);
        config.setAutoCommit(true);
        // 池中最小空闲连接数量
        config.setMinimumIdle(2);
        // 池中最大连接数量
        config.setMaximumPoolSize(32);
        dataSource = new HikariDataSource(config);

        log.info("[PowerDatasource] init h2 datasource successfully, use url: {}", config.getJdbcUrl());

        // JVM 关闭时删除数据库文件
        try {
            FileUtils.forceDeleteOnExit(new File(H2_PATH));
            log.info("[PowerDatasource] delete worker db file[{}] on JVM exit successfully", H2_PATH);
        }catch (Throwable t) {
            log.warn("[PowerDatasource] delete file on JVM exit failed: {}", H2_PATH, t);
        }
    }

}

ConnectionFactory在initDatasource的时候会根据StoreStrategy的类型来设置H2的jdbcUrl，如果是DISK则jdbcUrl为jdbc:h2:file:%spowerjob_worker_db;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false，如果是MEMORY的话，jdbcUrl为jdbc:h2:mem:%spowerjob_worker_db;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false；其中%s为H2_PATH，取的是PowerFileUtils.workspace() + "/h2/" + CommonUtils.genUUID() + "/"

workspace

tech/powerjob/worker/common/utils/PowerFileUtils.java

@Slf4j
public class PowerFileUtils {

    /**
     * 获取工作目录
     * @return 允许用户通过启动配置文件自定义存储目录，默认为 user.home
     */
    public static String workspace() {
        String workspaceByDKey = System.getProperty(PowerJobDKey.WORKER_WORK_SPACE);
        if (StringUtils.isNotEmpty(workspaceByDKey)) {
            log.info("[PowerFileUtils] [workspace] use custom workspace: {}", workspaceByDKey);
            return workspaceByDKey;
        }
        final String userHome = System.getProperty("user.home").concat("/powerjob/worker");
        log.info("[PowerFileUtils] [workspace] use user.home as workspace: {}", userHome);
        return userHome;
    }
}

workspace先从系统属性取powerjob.worker.workspace，若没有则取home目录下的powerjob/worker目录

PowerJobProperties

tech/powerjob/worker/autoconfigure/PowerJobProperties.java

    @Setter
    @Getter
    public static class Worker {

        //......

        /**
         * Protocol for communication between WORKER and server
         */
        private Protocol protocol = Protocol.AKKA;
        /**
         * Local store strategy for H2 database. {@code disk} or {@code memory}.
         */
        private StoreStrategy storeStrategy = StoreStrategy.DISK;

        //......
    }    

PowerJobProperties.Worker的storeStrategy默认为DISK类型

小结

PowerJob的StoreStrategy枚举定义了DISK、MEMORY两个枚举，默认为DISK类型，它配置的是H2数据库的jdbcUrl是使用file的还是memory的，file的默认path为home目录下的powerjob/worker目录。