mdsalutil/mdsalutil-api/src/main/java/org/opendaylight/genius/infra/TransactionAdapter.java

   1 /*
   2  * Copyright © 2018 Red Hat, Inc. and others.
   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.genius.infra;
   9 import com.google.common.base.Preconditions;
  10 import com.google.common.util.concurrent.FluentFuture;
  11 import java.util.Optional;
  12 import org.eclipse.jdt.annotation.NonNull;
  13 import org.opendaylight.mdsal.binding.api.ReadWriteTransaction;
  14 import org.opendaylight.mdsal.binding.api.WriteTransaction;
  15 import org.opendaylight.mdsal.common.api.CommitInfo;
  16 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  17 import org.opendaylight.yangtools.yang.binding.DataObject;
  18 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  19
  20 /**
  21  * Adapter allowing managed, datastore-constrained transactions to be used with methods expecting
  22  * generic {@link org.opendaylight.mdsal.binding.api.DataBroker} transactions.
  23  *
  24  * <p>The adapted transactions maintain the following constraints: they cannot be cancelled or
  25  * submitted (only the transaction manager can do this), and they cannot access a logical datastore
  26  * other than the one they were created for.
  27  */
  28 @Deprecated
  29 public final class TransactionAdapter {
  30     private TransactionAdapter() {
  31
  32     }
  33
  34     /**
  35      * Adapts the given datastore-constrained read-write transaction to a generic read-write transaction.
  36      *
  37      * @param datastoreTx The transaction to adapt.
  38      * @return The adapted transaction.
  39      */
  40     public static ReadWriteTransaction toReadWriteTransaction(
  41             TypedReadWriteTransaction<? extends Datastore> datastoreTx) {
  42         if (datastoreTx instanceof TypedReadWriteTransactionImpl) {
  43             TypedReadWriteTransactionImpl nonSubmitCancelableDatastoreReadWriteTransaction =
  44                     (TypedReadWriteTransactionImpl) datastoreTx;
  45             return new ReadWriteTransactionAdapter(nonSubmitCancelableDatastoreReadWriteTransaction
  46                     .datastoreType, nonSubmitCancelableDatastoreReadWriteTransaction);
  47         }
  48         throw new IllegalArgumentException(
  49                 "Unsupported TypedWriteTransaction implementation " + datastoreTx.getClass());
  50     }
  51
  52     /**
  53      * Adapts the given datastore-constrained write transaction to a generic write transaction. Note that this
  54      * can be used to adapt a read-write transaction to a write transaction.
  55      *
  56      * @param datastoreTx The transaction to adapt.
  57      * @return The adapted transaction.
  58      */
  59     public static WriteTransaction toWriteTransaction(TypedWriteTransaction<? extends Datastore> datastoreTx) {
  60         if (datastoreTx instanceof TypedWriteTransactionImpl) {
  61             TypedWriteTransactionImpl nonSubmitCancelableDatastoreWriteTransaction =
  62                     (TypedWriteTransactionImpl) datastoreTx;
  63             return new WriteTransactionAdapter(nonSubmitCancelableDatastoreWriteTransaction.datastoreType,
  64                     nonSubmitCancelableDatastoreWriteTransaction);
  65         }
  66         throw new IllegalArgumentException(
  67                 "Unsupported TypedWriteTransaction implementation " + datastoreTx.getClass());
  68     }
  69
  70     // We want to subclass this class, even though it has a private constructor
  71     @SuppressWarnings("FinalClass")
  72     private static class WriteTransactionAdapter<D extends Datastore> implements WriteTransaction {
  73         final LogicalDatastoreType datastoreType;
  74         final TypedWriteTransaction<D> delegate;
  75
  76         private WriteTransactionAdapter(LogicalDatastoreType datastoreType,
  77                                         TypedWriteTransaction<D> delegate) {
  78             this.datastoreType = datastoreType;
  79             this.delegate = delegate;
  80         }
  81
  82         @Override
  83         public <T extends DataObject> void put(LogicalDatastoreType store, InstanceIdentifier<T> path,
  84                                                T data) {
  85             checkStore(store);
  86             delegate.put(path, data);
  87         }
  88
  89         @Override
  90         public <T extends DataObject> void mergeParentStructurePut(LogicalDatastoreType store,
  91                                                                    InstanceIdentifier<T> path, T data) {
  92             checkStore(store);
  93             delegate.mergeParentStructurePut(path, data);
  94         }
  95
  96         @Override
  97         public <T extends DataObject> void merge(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
  98             checkStore(store);
  99             delegate.merge(path, data);
 100         }
 101
 102         @Override
 103         public <T extends DataObject> void mergeParentStructureMerge(LogicalDatastoreType store,
 104                                                                      InstanceIdentifier<T> path, T data) {
 105             checkStore(store);
 106             delegate.mergeParentStructureMerge(path, data);
 107         }
 108
 109         @Override
 110         public boolean cancel() {
 111             throw new UnsupportedOperationException("Managed transactions mustn't be cancelled");
 112         }
 113
 114         @Override
 115         public void delete(LogicalDatastoreType store, InstanceIdentifier<?> path) {
 116             checkStore(store);
 117             delegate.delete(path);
 118         }
 119
 120         @Override
 121         public @NonNull FluentFuture<? extends CommitInfo> commit() {
 122             throw new UnsupportedOperationException("Managed transactions mustn't be committed");
 123         }
 124
 125         void checkStore(LogicalDatastoreType store) {
 126             Preconditions.checkArgument(datastoreType.equals(store), "Invalid "
 127                             + "datastore %s  used instead of %s", store, datastoreType);
 128         }
 129
 130         @Override
 131         public Object getIdentifier() {
 132             return delegate.getIdentifier();
 133         }
 134     }
 135
 136     private static final class ReadWriteTransactionAdapter<D extends Datastore> extends
 137             WriteTransactionAdapter<D>
 138             implements ReadWriteTransaction {
 139         private final TypedReadWriteTransaction<D> delegate;
 140
 141         private ReadWriteTransactionAdapter(LogicalDatastoreType datastoreType,
 142                                             TypedReadWriteTransaction<D> delegate) {
 143             super(datastoreType, delegate);
 144             this.delegate = delegate;
 145         }
 146
 147         @Override
 148         public @NonNull <T extends DataObject> FluentFuture<Optional<T>> read(@NonNull LogicalDatastoreType
 149                                                                                                store,@NonNull
 150                 InstanceIdentifier<T> path) {
 151             checkStore(store);
 152             return FluentFuture.from(delegate.read(path));
 153         }
 154
 155         @Override
 156         public FluentFuture<Boolean> exists(LogicalDatastoreType store, InstanceIdentifier<?> path) {
 157             checkStore(store);
 158             return FluentFuture.from(delegate.exists(path));
 159         }
 160     }
 161 }