opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/LocalReadOnlyProxyTransaction.java

   1 /*
   2  * Copyright (c) 2016 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 package org.opendaylight.controller.cluster.databroker.actors.dds;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.base.Verify;
  12 import java.util.function.Consumer;
  13 import javax.annotation.concurrent.NotThreadSafe;
  14 import org.opendaylight.controller.cluster.access.commands.CommitLocalTransactionRequest;
  15 import org.opendaylight.controller.cluster.access.commands.ModifyTransactionRequest;
  16 import org.opendaylight.controller.cluster.access.commands.PersistenceProtocol;
  17 import org.opendaylight.controller.cluster.access.concepts.Response;
  18 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  21 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
  22
  23 /**
  24  * A read-only specialization of {@link LocalProxyTransaction}.
  25  *
  26  * @author Robert Varga
  27  */
  28 @NotThreadSafe
  29 final class LocalReadOnlyProxyTransaction extends LocalProxyTransaction {
  30
  31     private final DataTreeSnapshot snapshot;
  32
  33     LocalReadOnlyProxyTransaction(final ProxyHistory parent, final TransactionIdentifier identifier,
  34         final DataTreeSnapshot snapshot) {
  35         super(parent, identifier);
  36         this.snapshot = Preconditions.checkNotNull(snapshot);
  37     }
  38
  39     @Override
  40     boolean isSnapshotOnly() {
  41         return true;
  42     }
  43
  44     @Override
  45     DataTreeSnapshot readOnlyView() {
  46         return snapshot;
  47     }
  48
  49     @Override
  50     void doDelete(final YangInstanceIdentifier path) {
  51         throw new UnsupportedOperationException("Read-only snapshot");
  52     }
  53
  54     @Override
  55     void doMerge(final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
  56         throw new UnsupportedOperationException("Read-only snapshot");
  57     }
  58
  59     @Override
  60     void doWrite(final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
  61         throw new UnsupportedOperationException("Read-only snapshot");
  62     }
  63
  64     @Override
  65     CommitLocalTransactionRequest commitRequest(final boolean coordinated) {
  66         throw new UnsupportedOperationException("Read-only snapshot");
  67     }
  68
  69     @Override
  70     void doSeal() {
  71         // No-op
  72     }
  73
  74     @Override
  75     void flushState(final AbstractProxyTransaction successor) {
  76         // No-op
  77     }
  78
  79     @Override
  80     void applyForwardedModifyTransactionRequest(final ModifyTransactionRequest request,
  81             final Consumer<Response<?, ?>> callback) {
  82         commonModifyTransactionRequest(request);
  83         abort();
  84     }
  85
  86     @Override
  87     void replayModifyTransactionRequest(final ModifyTransactionRequest request,
  88             final Consumer<Response<?, ?>> callback, final long enqueuedTicks) {
  89         commonModifyTransactionRequest(request);
  90         enqueueAbort(callback, enqueuedTicks);
  91     }
  92
  93     private static void commonModifyTransactionRequest(final ModifyTransactionRequest request) {
  94         Verify.verify(request.getModifications().isEmpty());
  95
  96         final PersistenceProtocol protocol = request.getPersistenceProtocol().get();
  97         Verify.verify(protocol == PersistenceProtocol.ABORT);
  98     }
  99 }