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Example for Memcached

Purpose

This project is to understand how to use Memcached Client by spymemcached.
And I try to write down to make easy understand.
If you have any problem, please contact me.

Environment

  • Java 1.8
  • memcached 1.4.5
  • spymemcached 2.8.4

This is the basic step for example.

    // 1. Connect to Memcached
    
    MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
    
    System.out.println("Connection to server successful.");

    // ...
    
    // 9. Disconnect from Memcached

    mcc.shutdown();

ConnectionMemcached.java

This is for connection between Server and Client.

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Disconnect from Memcached
            mcc.shutdown();

SetNGetCmdMemcached.java

This is basic operation of Cache service.

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_KEY, 900, MY_VALUE);

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 4. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mykey's value in cache : myvalue

AddCmdMemcached.java

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_KEY, 900, MY_VALUE1);

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 4. Add cache at Memcached
            fo = mcc.add(MY_KEY, 900, MY_VALUE2);

            System.out.println("add status : " + fo.get());

            // 5. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 6. Add cache at Memcached
            fo = mcc.add(MY_KEY, 900, MY_VALUE3);

            System.out.println("add status : " + fo.get());

            // 7. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 8. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mykey's value in cache : myvalue1
add status : false
mykey's value in cache : myvalue1
add status : false
mykey's value in cache : myvalue1

DeleteCmdMemCached.java

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_KEY, 900, MY_VALUE);

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 4. Delete cache from Memcached
            fo = mcc.delete(MY_KEY);

            System.out.println("delete status : " + fo.get());

            // 5. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 6. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mykey's value in cache : myvalue
delete status : true
mykey's value in cache : null

AppendCmdMemcached.java

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_KEY, 900, MY_VALUE1);

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 4. Append cache at Memcached
            fo = mcc.append(0, MY_KEY, MY_VALUE2);

            System.out.println("append status : " + fo.get());

            // 5. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 6. Append cache at Memcached
            fo = mcc.append(0, MY_KEY, MY_VALUE3);

            System.out.println("append status : " + fo.get());

            // 7. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 8. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mykey's value in cache : myvalue1
append status : true
mykey's value in cache : myvalue1myvalue2
append status : true
mykey's value in cache : myvalue1myvalue2myvalue3

PrependCmdMemcached.java

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_KEY, 900, MY_VALUE1);

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));


            // 4. Prepend cache at Memcached
            fo = mcc.prepend(0, MY_KEY, MY_VALUE2);

            System.out.println("prepend status : " + fo.get());

            // 5. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 6. Prepend cache at Memcached
            fo = mcc.prepend(0, MY_KEY, MY_VALUE3);

            System.out.println("prepend status : " + fo.get());

            // 7. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 8. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mykey's value in cache : myvalue1
prepend status : true
mykey's value in cache : myvalue2myvalue1
prepend status : true
mykey's value in cache : myvalue3myvalue2myvalue1

ReplaceCmdMemcached.java

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_KEY, 900, MY_VALUE1);

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 4. Replace cache at Memcached
            fo = mcc.replace(MY_KEY, 900, MY_VALUE2);

            System.out.println("replace status : " + fo.get());

            // 5. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 6. Replace cache at Memcached
            fo = mcc.replace(MY_KEY, 900, MY_VALUE3);

            System.out.println("replace status : " + fo.get());

            // 7. Retrieve cache at Memcached
            System.out.println(MY_KEY + "'s value in cache : " + mcc.get(MY_KEY));

            // 8. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mykey's value in cache : myvalue1
replace status : true
mykey's value in cache : myvalue2
replace status : true
mykey's value in cache : myvalue3

IncrNDecrCmdMemcached.java

            // 1. Connect to Memcached
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
            System.out.println("Connection to server successful.");

            // 2. Store cache at Memcached
            Future fo = mcc.set(MY_NUM, 900, "100");

            System.out.println("set status : " + fo.get());

            // 3. Retrieve cache at Memcached
            System.out.println(MY_NUM + "'s value in cache : " + mcc.get(MY_NUM));

            // 4. Incr cache at Memcached
            System.out.println(MY_NUM + "'s value in cache after Incr : " + mcc.incr(MY_NUM, 1));

            // 5. Decr cache at Memcached
            System.out.println(MY_NUM + "'s value in cache after Decr : " + mcc.decr(MY_NUM, 4));

            // 6. Disconnect from Memcached
            mcc.shutdown();

This is the result you expected.

Connection to server successful.
set status : true
mynum's value in cache : 100
mynum's value in cache after Incr : 101
mynum's value in cache after Decr : 97

Writer

email : u4rang@gmail.com
Github : https://github.com/u4rang

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