Java_ Spymemcache - - Alibaba Cloud Documentation Center

About the client

For more information about the client, see spymemcached.

For more information about how to download the client, see spymemcached.

Java sample code

Prepare the Java development environment. Log on to an Alibaba Cloud Elastic Compute Service (ECS) instance and install the Java Development Kit (JDK) and a commonly used integrated development environment (IDE) such as Eclipse on the instance.
Java JDK (Download address)
Eclipse (Download address)

Copy the following Java code to the Eclipse project.

Note

In this case, the code compilation fails. The download address of a third-party JAR package is required to call the cache service of ApsaraDB for Memcache. If the JAR package is added, the code compilation succeeds.

OcsSample1.java sample code (username and password are required.)

 import java.io.IOException;
 import java.util.concurrent.ExecutionException; 
 import net.spy.memcached.AddrUtil;
 import net.spy.memcached.ConnectionFactoryBuilder;
 import net.spy.memcached.ConnectionFactoryBuilder.Protocol;
 import net.spy.memcached.MemcachedClient;
 import net.spy.memcached.auth.AuthDescriptor;
 import net.spy.memcached.auth.PlainCallbackHandler;
 import net.spy.memcached.internal.OperationFuture;

 public class OcsSample1 { 

      public static void main(String[] args) { 

                final String host = "xxxxxxxx.m.yyyyyyyyyy.ocs.aliyuncs.com";//The "Intranet address" on the console
                final String port ="11211"; //Default port 11211, no need to change
                final String username = "xxxxxxxxx";//The "instance ID" in the console. The username of the new version of ApsaraDB for Memcache can be left blank.
                final String password = "my_password";//The “password” provided in the email
                MemcachedClient cache = null;
                try {
                         AuthDescriptor ad = new AuthDescriptor(new String[]{"PLAIN"}, new PlainCallbackHandler(username, password));

                         cache = new MemcachedClient(
                                            new ConnectionFactoryBuilder().setProtocol(Protocol.BINARY)
                                 .setAuthDescriptor(ad)
                                 .build(),
                                 AddrUtil.getAddresses(host + ":" + port));

                         System.out.println("ApsaraDB for Memcache Sample Code");

                         //Store a piece of data with the “ocs” key into the ApsaraDB for Memcache to facilitate subsequent data verification and reading.
                         String key = "ocs";
                         String value = "Open Cache Service,  from www.Aliyun.com";
                         int expireTime = 1000; // Expiration time, unit: second; starts timing from the data write. After the expireTime elapses, the data will become expired and won't be read;
                         OperationFuture<Boolean> future = cache.set(key, expireTime, value);
                         future.get();  // The spymemcached set() method is asynchronous. The future.get() waits for the cache.set() operation to complete. You can also choose not to wait based on your needs.
                         //Store several pieces of data into the ApsaraDB for Memcache and then you can see the statistics information on the ApsaraDB for Memcache console.
                         for(int i=0;i<100;i++){
                                key="key-"+i;
                                value="value-"+i;

                                //Run the set operation and store data into the cache
                                expireTime = 1000; // Expiration time, unit: seconds
                                future = cache.set(key, expireTime, value);
                                future.get();  //  Make sure the previous (cache.set()) operation has been completed
                         }
                         System.out.println("Set operation is completed.");
                            //Run the get operation and read data from the cache. Read data with the “ocs” key.

                         System.out.println("Get operation:"+cache.get(key));

                                } catch (IOException e) {
                                       e.printStackTrace();
                                } catch (InterruptedException e) {
                                       e.printStackTrace();
                                } catch (ExecutionException e) {
                                       e.printStackTrace();
                                }
                                if (cache != null) {
                                       cache.shutdown();
                                }

      }//eof    
 }

OcsSample2.java sample code (username and password are optional.)

 import java.io.IOException;
 import java.util.concurrent.ExecutionException;

 import net.spy.memcached.AddrUtil;
 import net.spy.memcached.BinaryConnectionFactory;
 import net.spy.memcached.MemcachedClient;
 import net.spy.memcached.internal.OperationFuture;

 public class OcsSample2 {

 public static void main(String[] args) {

     final String host = "xxxxxxxx.m.yyyyyyyyyy.ocs.aliyuncs.com"; //The “intranet address” on the console
     final String port = "11211"; //Default port 11211, no need to change

     MemcachedClient cache = null;
     try {

         cache = new MemcachedClient(new BinaryConnectionFactory(), AddrUtil.getAddresses(host + ":" + port));

         System.out.println("OCS Sample Code");

         //Store a piece of data with the “ocs” key into the ApsaraDB for Memcache to facilitate subsequent data verification and reading.
         String key = "ocs";
         String value = "Open Cache Service,  from www.Aliyun.com";
         int expireTime = 1000; // Expiration time, unit: second; starts timing from the data write. After the expireTime elapses, the data will become expired and won't be read;
         OperationFuture<Boolean> future = cache.set(key, expireTime, value);
         future.get();
         //Store several pieces of data into the ApsaraDB for Memcache and then you can see the statistics information on the ApsaraDB for Memcache console.
         for (int i = 0; i < 100; i++) {
             key = "key-" + i;
             value = "value-" + i;

             //Run the set operation and store data into the cache
             expireTime = 1000; // expiration time,unit:second
             future = cache.set(key, expireTime, value);
             future.get();
         }

         System.out.println(”Set operation completed.");

         //Run the get operation and read data from the cache. Read data with the “ocs” key.
         System.out.println("Get operation:" + cache.get(key));

     } catch (IOException e) {
         e.printStackTrace();
     } catch (InterruptedException e) {
         e.printStackTrace();
     } catch (ExecutionException e) {
         e.printStackTrace();
     }
     if (cache != null) {
         cache.shutdown();
     }

 }//eof
 }

Modify several items in OcsSample1.java in Eclipse based on the instance information.
The IDs and internal endpoints of ApsaraDB for Memcache instances are unique. You can view the instance IDs and internal endpoints of the instances in the ApsaraDB for Memcache console. When you connect to your ApsaraDB for Memcache instance, you must modify the corresponding information in OcsSample1.java based on the ID and endpoint of the instance.
Run you program after the modification. Call the main function, and you can view the following result in the console window of Eclipse. If an INFO message is displayed in red for debugging, ignore the message.
```
 OCS Sample Code
 Set operation is completed.
 Get operation: Open Cache Service, from www.Aliyun.com
```