opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/messages/DataExists.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.cluster.datastore.messages;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13 import com.google.common.util.concurrent.SettableFuture;
  14 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  15 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  17
  18 public class DataExists extends AbstractRead<Boolean> {
  19     private static final long serialVersionUID = 1L;
  20
  21     public DataExists() {
  22     }
  23
  24     public DataExists(final YangInstanceIdentifier path, final short version) {
  25         super(path, version);
  26     }
  27
  28     @Override
  29     public CheckedFuture<Boolean, ReadFailedException> apply(DOMStoreReadTransaction readDelegate) {
  30         return readDelegate.exists(getPath());
  31     }
  32
  33     @Override
  34     public void processResponse(Object response, SettableFuture<Boolean> returnFuture) {
  35         if (DataExistsReply.isSerializedType(response)) {
  36             returnFuture.set(Boolean.valueOf(DataExistsReply.fromSerializable(response).exists()));
  37         } else {
  38             returnFuture.setException(new ReadFailedException("Invalid response checking exists for path "
  39                     + getPath()));
  40         }
  41     }
  42
  43     @Override
  44     protected AbstractRead<Boolean> newInstance(short withVersion) {
  45         return new DataExists(getPath(), withVersion);
  46     }
  47
  48     public static DataExists fromSerializable(final Object serializable) {
  49         Preconditions.checkArgument(serializable instanceof DataExists);
  50         return (DataExists)serializable;
  51     }
  52
  53     public static boolean isSerializedType(Object message) {
  54         return message instanceof DataExists;
  55     }
  56 }