CDS: use internal DataTree instance

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardDataTreeCohort.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardDataTreeCohort.java
new file mode 100644 (file)
index 0000000..11b3ca8
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+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardDataTreeCohort.java
@@ -0,0 +1,78 @@
+/*
+ * 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 com.google.common.base.Preconditions;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateTip;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class ShardDataTreeCohort implements DOMStoreThreePhaseCommitCohort {
+    private static final Logger LOG = LoggerFactory.getLogger(ShardDataTreeCohort.class);
+    private static final ListenableFuture<Boolean> TRUE_FUTURE = Futures.immediateFuture(Boolean.TRUE);
+    private static final ListenableFuture<Void> VOID_FUTURE = Futures.immediateFuture(null);
+    private final DataTreeModification transaction;
+    private final ShardDataTree dataTree;
+    private DataTreeCandidateTip candidate;
+
+    ShardDataTreeCohort(final ShardDataTree dataTree, final DataTreeModification transaction) {
+        this.dataTree = Preconditions.checkNotNull(dataTree);
+        this.transaction = Preconditions.checkNotNull(transaction);
+    }
+
+    @Override
+    public ListenableFuture<Boolean> canCommit() {
+        try {
+            dataTree.getDataTree().validate(transaction);
+            LOG.debug("Transaction {} validated", transaction);
+            return TRUE_FUTURE;
+        } catch (Exception e) {
+            return Futures.immediateFailedFuture(e);
+        }
+    }
+
+    @Override
+    public ListenableFuture<Void> preCommit() {
+        try {
+            candidate = dataTree.getDataTree().prepare(transaction);
+            /*
+             * FIXME: this is the place where we should be interacting with persistence, specifically by invoking
+             *        persist on the candidate (which gives us a Future).
+             */
+            LOG.debug("Transaction {} prepared candidate {}", transaction, candidate);
+            return VOID_FUTURE;
+        } catch (Exception e) {
+            LOG.debug("Transaction {} failed to prepare", transaction, e);
+            return Futures.immediateFailedFuture(e);
+        }
+    }
+
+    @Override
+    public ListenableFuture<Void> abort() {
+        // No-op, really
+        return VOID_FUTURE;
+    }
+
+    @Override
+    public ListenableFuture<Void> commit() {
+        try {
+            dataTree.getDataTree().commit(candidate);
+        } catch (Exception e) {
+            LOG.error("Transaction {} failed to commit", transaction, e);
+            return Futures.immediateFailedFuture(e);
+        }
+
+        LOG.debug("Transaction {} committed, proceeding to notify", transaction);
+        dataTree.notifyListeners(candidate);
+        return VOID_FUTURE;
+    }
+}