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我在方解石的帮助下构建了我的自定义模式。现在我想通过 servlet 公开它并用 Avatica 连接到它。我正在使用 servlet，因为我的容器是 JIRA。这是来自servlet的一些相关代码

public class JDBCServlet extends HttpServlet {

private final Service service;
private final ProtobufHandler pbHandler;
private final ProtobufTranslation protobufTranslation;
private final MetricsSystem metrics;

final ThreadLocal<UnsynchronizedBuffer> threadLocalBuffer;

public JDBCServlet(LocalDBProvider provider) {
    this.service = provider.service();
    this.metrics = provider.metrics();
    this.protobufTranslation = new ProtobufTranslationImpl();
    this.pbHandler = new ProtobufHandler(service, protobufTranslation, metrics);
    this.threadLocalBuffer = new ThreadLocal<UnsynchronizedBuffer>() {
        @Override
        public UnsynchronizedBuffer initialValue() {
            return new UnsynchronizedBuffer();
        }
    };
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("DO GET DO GET");
    doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("DO POST DO POST");
    response.setContentType("application/octet-stream;charset=utf-8");
    response.setStatus(HttpServletResponse.SC_OK);
    final byte[] requestBytes;
    // Avoid a new buffer creation for every HTTP request
    final UnsynchronizedBuffer buffer = threadLocalBuffer.get();
    try (ServletInputStream inputStream = request.getInputStream()) {
        requestBytes = AvaticaUtils.readFullyToBytes(inputStream, buffer);
    } finally {
        buffer.reset();
    }

    Handler.HandlerResponse<byte[]> handlerResponse;
    try {
        handlerResponse = pbHandler.apply(requestBytes);
    } catch (Exception e) {
        handlerResponse = pbHandler.convertToErrorResponse(e);
    }
    response.setStatus(handlerResponse.getStatusCode());
    response.getOutputStream().write(handlerResponse.getResponse());
    response.getOutputStream().close();
}
}

代码基于 AvaticaProtobufHandler 而没有 Jetty 相关的东西。

服务是使用 LocalService 和 CalciteConnection 和我的自定义模式构建的：

new LocalService(DRIVER.createMeta((AvaticaConnection) bootstrap.getConnection()));

使用 url 连接松鼠（使用 avatica jars:) 时：jdbc:avatica:remote:url= http://127.0.0.1:2990/jira/plugins/servlet/smartqljdbctest;serialization=PROTOBUF

几个 HTTP POST 请求与驱动程序握手，但 Meta.toProto() 方法的整个事情都失败了：

    } else {
      // Can a "row" be a primitive? A struct? Only an Array?
      throw new RuntimeException("Only arrays are supported");
    }

我假设我错误地引导了 servlet，但不知道为什么？

4

1 回答 1

0

在弄乱 Calcite 之后，我设法使用 Evatica Server 示例中的 JDBCMeta 处理了这个问题。

从我之前的解决方案中，我认为基于 CalciteConnection 的 Driver 生成的 Meta 与 avatica LocalService 实现不兼容。

于 2017-11-02T22:17:29.670 回答