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.util.concurrent.CheckedFuture;
  12 import com.google.common.util.concurrent.SettableFuture;
  13 import org.opendaylight.controller.cluster.datastore.DataStoreVersions;
  14 import org.opendaylight.controller.cluster.datastore.util.InstanceIdentifierUtils;
  15 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  16 import org.opendaylight.controller.protobuff.messages.transaction.ShardTransactionMessages;
  17 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  19
  20 public class DataExists extends AbstractRead<Boolean> {
  21     private static final long serialVersionUID = 1L;
  22
  23     public DataExists() {
  24     }
  25
  26     public DataExists(final YangInstanceIdentifier path, final short version) {
  27         super(path, version);
  28     }
  29
  30     @Override
  31     public Object toSerializable() {
  32         if(getVersion() >= DataStoreVersions.BORON_VERSION) {
  33             return this;
  34         } else {
  35             return ShardTransactionMessages.DataExists.newBuilder().setInstanceIdentifierPathArguments(
  36                         InstanceIdentifierUtils.toSerializable(getPath())).build();
  37         }
  38     }
  39
  40     @Override
  41     public CheckedFuture<Boolean, ReadFailedException> apply(DOMStoreReadTransaction readDelegate) {
  42         return readDelegate.exists(getPath());
  43     }
  44
  45     @Override
  46     public void processResponse(Object response, SettableFuture<Boolean> returnFuture) {
  47         if(DataExistsReply.isSerializedType(response)) {
  48             returnFuture.set(Boolean.valueOf(DataExistsReply.fromSerializable(response).exists()));
  49         } else {
  50             returnFuture.setException(new ReadFailedException("Invalid response checking exists for path " + getPath()));
  51         }
  52     }
  53
  54     @Override
  55     protected AbstractRead<Boolean> newInstance(short withVersion) {
  56         return new DataExists(getPath(), withVersion);
  57     }
  58
  59     public static DataExists fromSerializable(final Object serializable){
  60         if(serializable instanceof DataExists) {
  61             return (DataExists)serializable;
  62         } else {
  63             ShardTransactionMessages.DataExists o = (ShardTransactionMessages.DataExists) serializable;
  64             return new DataExists(InstanceIdentifierUtils.fromSerializable(o.getInstanceIdentifierPathArguments()),
  65                     DataStoreVersions.LITHIUM_VERSION);
  66         }
  67     }
  68
  69     public static boolean isSerializedType(Object message) {
  70         return message instanceof DataExists || message instanceof ShardTransactionMessages.DataExists;
  71     }
  72 }