CDS: Implement front-end support for local transactions

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / TransactionContextFactory.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionContextFactory.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionContextFactory.java
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+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.datastore;
+
+import akka.actor.ActorSelection;
+import java.util.ArrayList;
+import java.util.Collection;
+import javax.annotation.concurrent.GuardedBy;
+import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
+import org.opendaylight.controller.cluster.datastore.messages.PrimaryShardInfo;
+import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
+import org.opendaylight.controller.cluster.datastore.utils.ShardInfoListenerRegistration;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionChain;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
+import scala.concurrent.Future;
+
+/**
+ * An {@link AbstractTransactionContextFactory} which produces TransactionContext instances for single
+ * transactions (ie not chained).
+ */
+final class TransactionContextFactory extends AbstractTransactionContextFactory<LocalTransactionFactoryImpl> {
+
+    @GuardedBy("childChains")
+    private final Collection<TransactionChainProxy> childChains = new ArrayList<>();
+
+    private final ShardInfoListenerRegistration<TransactionContextFactory> reg;
+
+    private TransactionContextFactory(final ActorContext actorContext) {
+        super(actorContext);
+        this.reg = actorContext.registerShardInfoListener(this);
+    }
+
+    static TransactionContextFactory create(final ActorContext actorContext) {
+        return new TransactionContextFactory(actorContext);
+    }
+
+    @Override
+    public void close() {
+        reg.close();
+    }
+
+    @Override
+    protected TransactionIdentifier nextIdentifier() {
+        return TransactionIdentifier.create(getMemberName(), TX_COUNTER.getAndIncrement(), null);
+    }
+
+    @Override
+    protected LocalTransactionFactoryImpl factoryForShard(final String shardName, final ActorSelection shardLeader, final DataTree dataTree) {
+        return new LocalTransactionFactoryImpl(getActorContext(), shardLeader, dataTree);
+    }
+
+    @Override
+    protected Future<PrimaryShardInfo> findPrimaryShard(final String shardName) {
+        return getActorContext().findPrimaryShardAsync(shardName);
+    }
+
+    @Override
+    protected <T> void onTransactionReady(final TransactionIdentifier transaction, final Collection<Future<T>> cohortFutures) {
+        // Transactions are disconnected, this is a no-op
+    }
+
+    DOMStoreTransactionChain createTransactionChain() {
+        final TransactionChainProxy ret = new TransactionChainProxy(this);
+
+        synchronized (childChains) {
+            childChains.add(ret);
+        }
+
+        return ret;
+    }
+
+    void removeTransactionChain(final TransactionChainProxy chain) {
+        synchronized (childChains) {
+            childChains.remove(chain);
+        }
+    }
+
+    @Override
+    public void onShardInfoUpdated(final String shardName, final PrimaryShardInfo primaryShardInfo) {
+        synchronized (childChains) {
+            for (TransactionChainProxy chain : childChains) {
+                chain.onShardInfoUpdated(shardName, primaryShardInfo);
+            }
+            super.onShardInfoUpdated(shardName, primaryShardInfo);
+        }
+    }
+
+    @Override
+    protected DataTree dataTreeForFactory(final LocalTransactionFactoryImpl factory) {
+        return factory.getDataTree();
+    }
+}