FEAT: Add gat(get and touch) command to get item & update item expira…

src/main/java/net/spy/memcached/ArcusClientPool.java

@@ -247,6 +247,26 @@ public GetFuture<CASValue<Object>> asyncGets(String key) {
     return this.getClient().asyncGets(key);
   }
 
+  @Override
+  public <T> GetFuture<T> asyncGetAndTouch(String key, int exp, Transcoder<T> tc) {
+    return this.getClient().asyncGetAndTouch(key, exp, tc);
+  }
+
+  @Override
+  public GetFuture<Object> asyncGetAndTouch(String key, int exp) {
+    return this.getClient().asyncGetAndTouch(key, exp);
+  }
+
+  @Override
+  public <T> GetFuture<CASValue<T>> asyncGetsAndTouch(String key, int exp, Transcoder<T> tc) {
+    return this.getClient().asyncGetsAndTouch(key, exp, tc);
+  }
+
+  @Override
+  public GetFuture<CASValue<Object>> asyncGetsAndTouch(String key, int exp) {
+    return this.getClient().asyncGetsAndTouch(key, exp);
+  }
+
   @Override
   public <T> CASValue<T> gets(String key, Transcoder<T> tc)
           throws OperationTimeoutException {

src/main/java/net/spy/memcached/MemcachedClient.java

@@ -980,6 +980,106 @@ public GetFuture<CASValue<Object>> asyncGets(final String key) {
     return asyncGets(key, transcoder);
   }
 
+  /**
+   * Get the given key to reset its expiration time asynchronously.
+   *
+   * @param key the key to fetch
+   * @param exp the new expiration to set for the given key
+   * @param tc the transcoder to serialize and unserialize value
+   * @return a future that will hold the return value of the fetch
+   * @throws IllegalStateException in the rare circumstance where queue is too
+   *                               full to accept any more requests
+   */
+  public <T> GetFuture<T> asyncGetAndTouch(final String key, final int exp,
+                                           final Transcoder<T> tc) {
+    final CountDownLatch latch = new CountDownLatch(1);
+    final GetFuture<T> future = new GetFuture<>(latch, operationTimeout);
+
+    Operation op = opFact.getAndTouch(key, exp,
+      new GetOperation.Callback() {
+        private GetResult<T> result = null;
+
+        public void receivedStatus(OperationStatus status) {
+          future.set(result, status);
+        }
+
+        public void gotData(String k, int flags, byte[] data) {
+          assert k.equals(key) : "Wrong key returned";
+          result = new GetResultImpl<>(new CachedData(flags, data, tc.getMaxSize()), tc);
+        }
+
+        public void complete() {
+          latch.countDown();
+        }
+      });
+    future.setOperation(op);
+    addOp(key, op);
+    return future;
+  }
+
+  /**
+   * Get the given key to reset its expiration time asynchronously.
+   *
+   * @param key the key to fetch
+   * @param exp the new expiration to set for the given key
+   * @return a future that will hold the return value of the fetch
+   * @throws IllegalStateException in the rare circumstance where queue is too
+   *                               full to accept any more requests
+   */
+  public GetFuture<Object> asyncGetAndTouch(final String key, final int exp) {
+    return asyncGetAndTouch(key, exp, transcoder);
+  }
+
+  /**
+   * Gets (with CAS support) the given key to reset its expiration time asynchronously.
+   *
+   * @param key the key to fetch
+   * @param exp the new expiration to set for the given key
+   * @param tc the transcoder to serialize and unserialize value
+   * @return a future that will hold the return value of the fetch
+   * @throws IllegalStateException in the rare circumstance where queue is too
+   *                               full to accept any more requests
+   */
+  public <T> GetFuture<CASValue<T>> asyncGetsAndTouch(final String key, final int exp,
+                                                      final Transcoder<T> tc) {
+    final CountDownLatch latch = new CountDownLatch(1);
+    final GetFuture<CASValue<T>> rv = new GetFuture<>(latch, operationTimeout);
+
+    Operation op = opFact.getsAndTouch(key, exp, new GetsOperation.Callback() {
+        private GetResult<CASValue<T>> val = null;
+
+        public void receivedStatus(OperationStatus status) {
+          rv.set(val, status);
+        }
+
+        public void gotData(String k, int flags, long cas, byte[] data) {
+          assert key.equals(k) : "Wrong key returned";
+          assert cas > 0 : "CAS was less than zero:  " + cas;
+          val = new GetsResultImpl<>(cas, new CachedData(flags, data, tc.getMaxSize()), tc);
+        }
+
+        public void complete() {
+          latch.countDown();
+        }
+      });
+    rv.setOperation(op);
+    addOp(key, op);
+    return rv;
+  }
+
+  /**
+   * Gets (with CAS support) the given key to reset its expiration time asynchronously.
+   *
+   * @param key the key to fetch
+   * @param exp the new expiration to set for the given key
+   * @return a future that will hold the return value of the fetch
+   * @throws IllegalStateException in the rare circumstance where queue is too
+   *                               full to accept any more requests
+   */
+  public GetFuture<CASValue<Object>> asyncGetsAndTouch(final String key, final int exp) {
+    return asyncGetsAndTouch(key, exp, transcoder);
+  }
+
   /**
    * Gets (with CAS support) with a single key.
    *

src/main/java/net/spy/memcached/MemcachedClientIF.java

@@ -82,6 +82,15 @@ <T> Future<CASValue<T>> asyncGets(String key,
 
   Future<CASValue<Object>> asyncGets(String key);
 
+  <T> Future<T> asyncGetAndTouch(final String key, final int exp, final Transcoder<T> tc);
+
+  Future<Object> asyncGetAndTouch(final String key, final int exp);
+
+  <T> Future<CASValue<T>> asyncGetsAndTouch(final String key, final int exp,
+                                            final Transcoder<T> tc);
+
+  Future<CASValue<Object>> asyncGetsAndTouch(final String key, final int exp);
+
   <T> CASValue<T> gets(String key, Transcoder<T> tc)
           throws OperationTimeoutException;
 

src/main/java/net/spy/memcached/OperationFactory.java

@@ -152,6 +152,26 @@ public interface OperationFactory {
    */
   GetsOperation gets(Collection<String> keys, GetsOperation.Callback cb, boolean isMGet);
 
+  /**
+   * Get the key and resets its timeout.
+   *
+   * @param key the key to get a value for and reset its timeout
+   * @param expiration the new expiration for the key
+   * @param cb the callback that will contain the result
+   * @return a new GetAndTouchOperation
+   */
+  GetOperation getAndTouch(String key, int expiration, GetOperation.Callback cb);
+
+  /**
+   * Gets (with CAS support) the key and resets its timeout.
+   *
+   * @param key the key to get a value for and reset its timeout
+   * @param expiration the new expiration for the key
+   * @param cb the callback that will contain the result
+   * @return a new GetsAndTouchOperation
+   */
+  GetsOperation getsAndTouch(String key, int expiration, GetsOperation.Callback cb);
+
   /**
    * Create a mutator operation.
    *

src/main/java/net/spy/memcached/ops/APIType.java

@@ -25,6 +25,7 @@ public enum APIType {
   INCR(OperationType.WRITE), DECR(OperationType.WRITE),
   DELETE(OperationType.WRITE),
   GET(OperationType.READ), GETS(OperationType.READ),
+  GAT(OperationType.WRITE), GATS(OperationType.WRITE),
 
   // List API Type
   LOP_CREATE(OperationType.WRITE),

src/main/java/net/spy/memcached/ops/OperationType.java

@@ -25,6 +25,7 @@ public enum OperationType {
    * BTreeInsertAndGetOperationImpl (asyncBopInsertAndGetTrimmed)
    * FlushOperationImpl / FlushByPrefixOperationImpl (flush)
    * SetAttrOperationImpl (asyncSetAttr)
+   * GetAndTouchOperationImpl / GetsAndTouchOperationImpl (asyncGetAndTouch / asyncGetsAndTouch)
    */
   WRITE,
 

src/main/java/net/spy/memcached/protocol/ascii/AsciiOperationFactory.java

@@ -109,6 +109,14 @@ public GetsOperation gets(Collection<String> keys, GetsOperation.Callback cb, bo
     return new GetsOperationImpl(keys, cb, isMGet);
   }
 
+  public GetOperation getAndTouch(String key, int expiration, GetOperation.Callback cb) {
+    return new GetAndTouchOperationImpl(key, expiration, cb);
+  }
+
+  public GetsOperation getsAndTouch(String key, int expiration, GetsOperation.Callback cb) {
+    return new GetsAndTouchOperationImpl(key, expiration, cb);
+  }
+
   public MutatorOperation mutate(Mutator m, String key, int by,
                                  long def, int exp, OperationCallback cb) {
     return new MutatorOperationImpl(m, key, by, def, exp, cb);

src/main/java/net/spy/memcached/protocol/ascii/BaseGetOpImpl.java

@@ -41,6 +41,7 @@ abstract class BaseGetOpImpl extends OperationImpl {
   private final String cmd;
   private final Collection<String> keys;
   private String currentKey = null;
+  private final int exp;
   private long casValue = 0;
   private int currentFlags = 0;
   private byte[] data = null;
@@ -55,9 +56,22 @@ public BaseGetOpImpl(String c,
     super(cb);
     cmd = c;
     keys = k;
+    exp = 0;
     setOperationType(OperationType.READ);
   }
 
+  /**
+   * For GetAndTouchOperationImpl,  GetsAndTouchOperationImpl Only
+   */
+  public BaseGetOpImpl(String c, int e,
+                       OperationCallback cb, Collection<String> k) {
+    super(cb);
+    cmd = c;
+    keys = k;
+    exp = e;
+    setOperationType(OperationType.WRITE);
+  }
+
   /**
    * Get the keys this GetOperation is looking for.
    */
@@ -73,6 +87,12 @@ public final void handleLine(String line) {
       ...
       END\r\n
     */
+    /* ENABLE_REPLICATION if */
+    if (hasSwitchedOver(line)) {
+      prepareSwitchover(line);
+      return;
+    }
+    /* ENABLE_REPLICATION end */
     if (line.equals("END")) {
       getLogger().debug("Get complete!");
       /* ENABLE_MIGRATION if */
@@ -184,6 +204,14 @@ public final void initialize() {
       commandBuilder.append(' ');
       commandBuilder.append(keysString);
       commandBuilder.append(RN_STRING);
+    } else if (cmd.equals("gat") || cmd.equals("gats")) {
+      // syntax: gat || gats <exp> <key>\r\n
+      commandBuilder.append(cmd);
+      commandBuilder.append(' ');
+      commandBuilder.append(exp);
+      commandBuilder.append(' ');
+      commandBuilder.append(keysString);
+      commandBuilder.append(RN_STRING);
     } else {
       assert (cmd.equals("mget") || cmd.equals("mgets"))
           : "Unknown Command " + cmd;
@@ -231,4 +259,7 @@ public boolean isBulkOperation() {
     return keys.size() > 1;
   }
 
+  public int getExpiration() {
+    return exp;
+  }
 }

src/main/java/net/spy/memcached/protocol/ascii/GetAndTouchOperationImpl.java

@@ -0,0 +1,36 @@
+/*
+ * arcus-java-client : Arcus Java client
+ * Copyright 2010-2014 NAVER Corp.
+ * Copyright 2014-present JaM2in Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.spy.memcached.protocol.ascii;
+
+import java.util.Collections;
+
+import net.spy.memcached.ops.APIType;
+import net.spy.memcached.ops.GetOperation;
+
+/**
+ * Implementation of the get and touch operation.
+ */
+class GetAndTouchOperationImpl extends BaseGetOpImpl implements GetOperation {
+  private static final String CMD = "gat";
+
+  public GetAndTouchOperationImpl(String k, int e, GetOperation.Callback cb) {
+    super(CMD, e, cb, Collections.singleton(k));
+    setAPIType(APIType.GAT);
+  }
+}

src/main/java/net/spy/memcached/protocol/ascii/GetsAndTouchOperationImpl.java

@@ -0,0 +1,36 @@
+/*
+ * arcus-java-client : Arcus Java client
+ * Copyright 2010-2014 NAVER Corp.
+ * Copyright 2014-present JaM2in Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.spy.memcached.protocol.ascii;
+
+import java.util.Collections;
+
+import net.spy.memcached.ops.APIType;
+import net.spy.memcached.ops.GetsOperation;
+
+/**
+ * Implementation of the gets and touch operation.
+ */
+class GetsAndTouchOperationImpl extends BaseGetOpImpl implements GetsOperation {
+  private static final String CMD = "gats";
+
+  public GetsAndTouchOperationImpl(String k, int e, GetsOperation.Callback cb) {
+    super(CMD, e, cb, Collections.singleton(k));
+    setAPIType(APIType.GATS);
+  }
+}

src/main/java/net/spy/memcached/protocol/binary/BinaryOperationFactory.java

@@ -112,6 +112,16 @@ public GetsOperation gets(Collection<String> keys, GetsOperation.Callback cb, bo
             "multiple key gets is not supported in binary protocol yet.");
   }
 
+  public GetOperation getAndTouch(String key, int expiration, GetOperation.Callback cb) {
+    throw new RuntimeException(
+            "GetAndTouchOperation is not supported in binary protocol yet.");
+  }
+
+  public GetsOperation getsAndTouch(String key, int expiration, GetsOperation.Callback cb) {
+    throw new RuntimeException(
+            "GetsAndTouchOperation is not supported in binary protocol yet.");
+  }
+
   public MutatorOperation mutate(Mutator m, String key, int by,
                                  long def, int exp, OperationCallback cb) {
     return new MutatorOperationImpl(m, key, by, def, exp, cb);

src/test/java/net/spy/memcached/ProtocolBaseCase.java

@@ -122,6 +122,25 @@ void testGetStatsCacheDump() throws Exception {
     assertTrue(val.matches("\\[acctime=\\d+, exptime=\\d+\\]"), val + "doesn't match");
   }
 
+//  @Test
+//  void testGetAndTouch() throws Exception {
+//    assertNull(client.get("testgat"));
+//    assertTrue(client.set("testgat", 3, "testgatvalue").get());
+//    GetFuture<Object> future = client.asyncGetAndTouch("testgat", 5);
+//    assertNotNull(future.get());
+//    assertEquals("testgatvalue", future.get());
+//  }
+//
+//  @Test
+//  void testGetsAndTouch() throws Exception {
+//    assertNull(client.get("testgats"));
+//    assertTrue(client.set("testgats", 3, "testgatsvalue").get());
+//    GetFuture<CASValue<Object>> future = client.asyncGetsAndTouch("testgats", 5);
+//    assertNotNull(future.get());
+//    assertEquals("testgatsvalue", future.get().getValue());
+//    assertTrue(future.get().getCas() > 0);
+//  }
+
   @Test
   void testDelayedFlush() throws Exception {
     assertNull(client.get("test1"));