聊聊PowerJob的StoreStrategy

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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@Getterpublic 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;//......}