使用 bean 在 customRestService 中查看 return 的最快方法

Question

我在 Xpage 上写了一个自定义的休息服务，它绑定到一个 bean。 Xpage 是：

<xe:restService
    id="restServiceCustom"
    pathInfo="custom"
    ignoreRequestParams="false"
    state="false"
    preventDojoStore="true">
    <xe:this.service>
        <xe:customRestService
            contentType="application/json"
            serviceBean="XXXX.PCServiceBean">
        </xe:customRestService>
    </xe:this.service>
</xe:restService>

我从网上一些优秀的帖子中拼凑出我的 java 代理。我刚开始就GET。我的代码运行但我看起来很慢（在我的开发服务器上）。我想尽快完成。我正在使用 ViewEntryCollection 并且我在我认为正在流式传输的每条记录上 "flushing"。

我在代码中加入了我自己的“[”，所以我认为我做的事情不对，因为我从未见过任何其他人这样做的例子。

如有任何建议，我们将不胜感激。

package com.XXXXX.bean;

import java.io.IOException;
import java.io.Writer;
import java.util.Vector;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.openntf.domino.Database;
import org.openntf.domino.Session;
import org.openntf.domino.View;
import org.openntf.domino.ViewEntry;
import org.openntf.domino.ViewEntryCollection;
import org.openntf.domino.utils.Factory;

import com.ibm.commons.util.io.json.JsonException;
import com.ibm.commons.util.io.json.util.JsonWriter;
import com.ibm.domino.services.ServiceException;
import com.ibm.domino.services.rest.RestServiceEngine;
import com.ibm.xsp.extlib.component.rest.CustomService;
import com.ibm.xsp.extlib.component.rest.CustomServiceBean;

public class PCServiceBean extends CustomServiceBean {

    @Override
    public void renderService(CustomService service, RestServiceEngine engine) throws ServiceException {
        try {
            HttpServletRequest request = engine.getHttpRequest();
            HttpServletResponse response = engine.getHttpResponse();

            response.setHeader("Content-Type", "application/json; charset=UTF-8");

            String method = request.getMethod();
            if (method.equals("GET")) {
                this.doGet(request, response);
            } else if (method.equals("POST")) {
                this.doPost(request, response);
            } else if (method.equals("PUT")) {
                this.doPut(request, response);
            } else if (method.equals("DELETE")) {
                this.doDelete(request, response);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    private void doDelete(HttpServletRequest request, HttpServletResponse response) {
        // TODO Auto-generated method stub

    }

    private void doPut(HttpServletRequest request, HttpServletResponse response) {
        // TODO Auto-generated method stub

    }

    private void doPost(HttpServletRequest request, HttpServletResponse response) {
        // TODO Auto-generated method stub

    }

    private void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, JsonException {

        Session session = Factory.getSession();
        Database DB = session.getDatabase(session.getCurrentDatabase().getServer(), "scoApps\PC\PCData.nsf");
        View pcView = DB.getView("viewAllByStatus");

        int i = 1;

        Writer out = response.getWriter();
        JsonWriter writer = new JsonWriter(out, false);

        writer.out("[");

        ViewEntryCollection vec = pcView.getAllEntries();
        int count = vec.getCount();

        for (ViewEntry entry : vec) {

            Vector<?> columnValues = entry.getColumnValues();

            writer.startObject();

            writer.startProperty("unid");
            writer.outStringLiteral(String.valueOf(columnValues.get(1)));
            writer.endProperty();

            writer.startProperty("status");
            writer.outStringLiteral(String.valueOf(columnValues.get(0)));
            writer.endProperty();

            writer.startProperty("assetTag");
            writer.outStringLiteral(String.valueOf(columnValues.get(2)));
            writer.endProperty();

            writer.startProperty("serialNumber");
            writer.outStringLiteral(String.valueOf(columnValues.get(3)));
            writer.endProperty();

            writer.startProperty("model");
            writer.outStringLiteral(String.valueOf(columnValues.get(4)));
            writer.endProperty();

            writer.startProperty("currentLocation");
            writer.outStringLiteral(String.valueOf(columnValues.get(5)));
            writer.endProperty();


            writer.endObject();

            if (i != count) {
                i = i + 1;
                writer.out(",");
                writer.flush();
            }

        }
        writer.out("]");
        writer.flush();
    }
}

Answer 1

将代码更改为

    JsonWriter writer = new JsonWriter(out, false);

    writer.startArray();

    ViewEntryCollection vec = pcView.getAllEntries();
    int count = vec.getCount();

    for (ViewEntry entry : vec) {

        Vector<?> columnValues = entry.getColumnValues();

        writer.startArrayItem();
        writer.startObject();

        writer.startProperty("unid");
        writer.outStringLiteral(String.valueOf(columnValues.get(1)));
        writer.endProperty();

        ...

        writer.endObject();
        writer.endArrayItem();
    }
    writer.endArray();
    writer.flush();

它使用 JsonWriter 的

startArray() 和 endArray() 而不是 out("[") 和 out("]")
startArrayItem() 和 endArrayItem() 而不是 out(",") 和 flush()

如果将 JsonWriter 的紧凑选项设置为 true，JSON 响应字符串会变短：

JsonWriter writer = new JsonWriter(out, true);

Answer 2

我看到两个问题。

首先 - 使用 ViewNavigator。这是对其性能提升的很好解释。

https://www.mindoo.com/web/blog.nsf/dx/17.01.2013085308KLEB9S.htm

其次 - 提前准备 JSON。这是一种很好的技术，可以避免不必要的代码（以及处理它的时间）从 Domino 文档中获取 JSON 数据。

https://quintessens.wordpress.com/2015/09/05/working-with-json-in-your-xpages-application/

使用 bean 在 customRestService 中查看 return 的最快方法

Fastest way to return view in customRestService using a bean

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