第12章 REST API

Ruby での REST API の使用

require 'net/http'

http = Net::HTTP.new('localhost', 8080)

#An example of how to create a new entry

http.post('/rest/MyData/MyKey', 'DATA_HERE', {"Content-Type" => "text/plain"})

#An example of using a GET operation to retrieve the key

puts http.get('/rest/MyData/MyKey').body

#An Example of using a PUT operation to overwrite the key

http.put('/rest/MyData/MyKey', 'MORE DATA', {"Content-Type" => "text/plain"})

#An example of Removing the remote copy of the key

http.delete('/rest/MyData/MyKey')

#An example of creating binary data

http.put('/rest/MyImages/Image.png', File.read('/Users/michaelneale/logo.png'), {"Content-Type" => "image/png"})

前提条件

ruby で JavaScript Object Notation (JSON) を使用して Red Hat JBoss Data Grid の REST インターフェースと対話するには、JSON Ruby ライブラリーをインストールし (プラットフォームのパッケージマネージャーまたは Ruby ドキュメンテーションを参照)、以下のコードを使用して要件を宣言します。

Ruby での JSON の使用

以下のコードは、Ruby で JavaScript Object Notation (JSON) と PUT 関数を使用して特定のデータ (この場合は、個人の名前と年齢) を送信する例です。

Python での REST API の使用

import httplib

#How to insert data

conn = httplib.HTTPConnection("localhost:8080")
data = "SOME DATA HERE \!" #could be string, or a file...
conn.request("POST", "/rest/default/0", data, {"Content-Type": "text/plain"})
response = conn.getresponse()
print response.status

#How to retrieve data

import httplib
conn = httplib.HTTPConnection("localhost:8080")
conn.request("GET", "/rest/default/0")
response = conn.getresponse()
print response.status
print response.read()

インポートの定義

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

文字列値をキャッシュに追加

// Using the imports in the previous example
public class RestExample {

   /**
    * Method that puts a String value in cache.
    * @param urlServerAddress
    * @param value
    * @throws IOException
    */

   public void putMethod(String urlServerAddress, String value) throws IOException {
      System.out.println("----------------------------------------");
      System.out.println("Executing PUT");
      System.out.println("----------------------------------------");
      URL address = new URL(urlServerAddress);
      System.out.println("executing request " + urlServerAddress);
      HttpURLConnection connection = (HttpURLConnection) address.openConnection();
      System.out.println("Executing put method of value: " + value);
      connection.setRequestMethod("PUT");
      connection.setRequestProperty("Content-Type", "text/plain");
      connection.setDoOutput(true);

      OutputStreamWriter outputStreamWriter = new OutputStreamWriter(connection.getOutputStream());
      outputStreamWriter.write(value);

      connection.connect();
      outputStreamWriter.flush();

      System.out.println("----------------------------------------");
      System.out.println(connection.getResponseCode() + " " + connection.getResponseMessage());
      System.out.println("----------------------------------------");

      connection.disconnect();
   }

キャッシュから文字列値を取得

    // Continuation of RestExample defined in previous example
		/**
    * Method that gets an value by a key in url as param value.
    * @param urlServerAddress
    * @return String value
    * @throws IOException
    */
   public String getMethod(String urlServerAddress) throws IOException {
      String line = new String();
      StringBuilder stringBuilder = new StringBuilder();

      System.out.println("----------------------------------------");
      System.out.println("Executing GET");
      System.out.println("----------------------------------------");

      URL address = new URL(urlServerAddress);
      System.out.println("executing request " + urlServerAddress);

      HttpURLConnection connection = (HttpURLConnection) address.openConnection();
      connection.setRequestMethod("GET");
      connection.setRequestProperty("Content-Type", "text/plain");
      connection.setDoOutput(true);

      BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));

      connection.connect();

      while ((line = bufferedReader.readLine()) != null) {
         stringBuilder.append(line + '\n');
      }

      System.out.println("Executing get method of value: " + stringBuilder.toString());

      System.out.println("----------------------------------------");
      System.out.println(connection.getResponseCode() + " " + connection.getResponseMessage());
      System.out.println("----------------------------------------");

      connection.disconnect();

      return stringBuilder.toString();
   }

Java Main メソッドの使用

    // Continuation of RestExample defined in previous example
		/**
    * Main method example.
    * @param args
    * @throws IOException
    */
    public static void main(String[] args) throws IOException {
        //Note that the cache name is "cacheX"
        RestExample restExample = new RestExample();
        restExample.putMethod("http://localhost:8080/rest/cacheX/1", "Infinispan REST Test");
        restExample.getMethod("http://localhost:8080/rest/cacheX/1");
    }
}