Spring yandex qatools postgresql嵌入式。是否需要在机器上安装postgres？

使用的依赖项：ru.yandex.qatools.embedded postgresql-embedded-2.5.jar

代码：

final File dbDir = new File("/tmp/embeddedinstallation" + port);
 String postgresInfo = embeddedPostgres.start(EmbeddedPostgres.cachedRuntimeConfig((dbDir).toPath()), "localhost", port, "db", "uname", "psswd", new ArrayList<String>());

参考：

它并没有提到postgres需要安装在机器上。 但我看到代码访问命令：

package ru.yandex.qatools.embed.postgresql;

import ru.yandex.qatools.embed.postgresql.config.PostgresConfig;
    public enum Command {
        Postgres("postgres", PostgresExecutable.class),
        InitDb("initdb", InitDbExecutable.class),
        CreateDb("createdb", CreateDbExecutable.class),
        PgCtl("pg_ctl", PgCtlExecutable.class),
        Psql("psql", PsqlExecutable.class),
        PgDump("pg_dump", PsqlExecutable.class),
        PgRestore("pg_restore", PsqlExecutable.class),
        Createuser("createuser", PsqlExecutable.class),
        ;

---

它是否需要在机器上安装postgres，还是我做了一些不正确的事情？

我想出来了，它确实会将postgres下载到指定的位置

/**
 * Initializes runtime configuration for cached directory.
 * If a provided directory is empty, postgres will be extracted into it.
 *
 * @param cachedPath path where postgres is supposed to be extracted
 * @return runtime configuration required for postgres to start
 */
public static IRuntimeConfig cachedRuntimeConfig(Path cachedPath) {
    final Command cmd = Command.Postgres;
    final FixedPath cachedDir = new FixedPath(cachedPath.toString());
    return new RuntimeConfigBuilder()
            .defaults(cmd)
            .artifactStore(new PostgresArtifactStoreBuilder()
                    .defaults(cmd)
                    .tempDir(cachedDir)
                    **.download(new PostgresDownloadConfigBuilder()
                            .defaultsForCommand(cmd)
                            .packageResolver(new PackagePaths(cmd, cachedDir))
                            .build()))**
            .build();
}

/**
 * Initializes runtime configuration for cached directory.
 * If a provided directory is empty, postgres will be extracted into it.
 *
 * @param cachedPath path where postgres is supposed to be extracted
 * @return runtime configuration required for postgres to start
 */
public static IRuntimeConfig cachedRuntimeConfig(Path cachedPath) {
    final Command cmd = Command.Postgres;
    final FixedPath cachedDir = new FixedPath(cachedPath.toString());
    return new RuntimeConfigBuilder()
            .defaults(cmd)
            .artifactStore(new PostgresArtifactStoreBuilder()
                    .defaults(cmd)
                    .tempDir(cachedDir)
                    **.download(new PostgresDownloadConfigBuilder()
                            .defaultsForCommand(cmd)
                            .packageResolver(new PackagePaths(cmd, cachedDir))
                            .build()))**
            .build();
}