gerrit.fd Code Review - hc2vpp.git/blob

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package io.fd.honeycomb.v3po.translate.util.read;
  18
  19 import com.google.common.base.Optional;
  20 import com.google.common.util.concurrent.CheckedFuture;
  21 import io.fd.honeycomb.v3po.translate.read.ReadContext;
  22 import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
  23 import io.fd.honeycomb.v3po.translate.read.Reader;
  24 import javax.annotation.Nonnull;
  25 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  26 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  27 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  28 import org.opendaylight.yangtools.yang.binding.DataObject;
  29 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  30
  31 /**
  32  * Simple DataBroker backed reader allowing to delegate reads to different brokers
  33  */
  34 public final class BindingBrokerReader<D extends DataObject> implements Reader<D> {
  35
  36     private final InstanceIdentifier<D> instanceIdentifier;
  37     private final DataBroker dataBroker;
  38     private final LogicalDatastoreType datastoreType;
  39
  40     public BindingBrokerReader(final Class<D> managedDataObjectType, final DataBroker dataBroker,
  41                                final LogicalDatastoreType datastoreType) {
  42         this.dataBroker = dataBroker;
  43         this.datastoreType = datastoreType;
  44         this.instanceIdentifier = InstanceIdentifier.create(managedDataObjectType);
  45     }
  46
  47     @Nonnull
  48     @Override
  49     public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
  50                                                @Nonnull final ReadContext ctx) throws ReadFailedException {
  51         try (final ReadOnlyTransaction readOnlyTransaction = dataBroker.newReadOnlyTransaction()) {
  52             final CheckedFuture<? extends Optional<? extends DataObject>, org.opendaylight.controller.md.sal.common.api.data.ReadFailedException>
  53                 read = readOnlyTransaction.read(datastoreType, id);
  54             try {
  55                 return read.checkedGet();
  56             } catch (org.opendaylight.controller.md.sal.common.api.data.ReadFailedException e) {
  57                 throw new ReadFailedException(id, e);
  58             }
  59         }
  60     }
  61
  62     @Nonnull
  63     @Override
  64     public InstanceIdentifier<D> getManagedDataObjectType() {
  65         return instanceIdentifier;
  66     }
  67 }