X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FAbstractFrontendHistory.java;h=dbea3a1cbb5cd00058c0bcf38dff6ce7f0b1e1b1;hp=7ddad749d26552676a8057b40ca7526677bac130;hb=de64c6bbf2d5aeb51f4036f9dd606a9bf6f71afb;hpb=cd2a6fa0d8fa6281be28d3c7b9828ecf4e932811

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/AbstractFrontendHistory.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/AbstractFrontendHistory.java
index 7ddad749d2..dbea3a1cbb 100644
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/AbstractFrontendHistory.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/AbstractFrontendHistory.java
@@ -7,14 +7,18 @@
  */
 package org.opendaylight.controller.cluster.datastore;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Ticker;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
 import javax.annotation.Nullable;
+import org.opendaylight.controller.cluster.access.commands.AbstractReadTransactionRequest;
 import org.opendaylight.controller.cluster.access.commands.CommitLocalTransactionRequest;
 import org.opendaylight.controller.cluster.access.commands.OutOfOrderRequestException;
+import org.opendaylight.controller.cluster.access.commands.TransactionPurgeRequest;
+import org.opendaylight.controller.cluster.access.commands.TransactionPurgeResponse;
 import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
 import org.opendaylight.controller.cluster.access.commands.TransactionSuccess;
 import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
@@ -55,41 +59,69 @@ abstract class AbstractFrontendHistory implements Identifiable<LocalHistoryIdent
 
     final @Nullable TransactionSuccess<?> handleTransactionRequest(final TransactionRequest<?> request,
             final RequestEnvelope envelope, final long now) throws RequestException {
-
-        // FIXME: handle purging of transactions
-
         final TransactionIdentifier id = request.getTarget();
-        FrontendTransaction tx = transactions.get(id);
-        if (tx == null) {
-            // The transaction does not exist and we are about to create it, check sequence number
-            if (request.getSequence() != 0) {
-                LOG.debug("{}: no transaction state present, unexpected request {}", persistenceId(), request);
-                throw UNSEQUENCED_START;
+
+        FrontendTransaction tx;
+        if (request instanceof TransactionPurgeRequest) {
+            tx = transactions.remove(id);
+            if (tx == null) {
+                // We have no record of the transaction, nothing to do
+                LOG.debug("{}: no state for transaction {}, purge is complete", persistenceId(), id);
+                return new TransactionPurgeResponse(id, request.getSequence());
             }
+        } else {
+            tx = transactions.get(id);
+            if (tx == null) {
+                // The transaction does not exist and we are about to create it, check sequence number
+                if (request.getSequence() != 0) {
+                    LOG.debug("{}: no transaction state present, unexpected request {}", persistenceId(), request);
+                    throw UNSEQUENCED_START;
+                }
 
-            if (request instanceof CommitLocalTransactionRequest) {
-                tx = createReadyTransaction(id, ((CommitLocalTransactionRequest) request).getModification());
-                LOG.debug("{}: allocated new ready transaction {}", persistenceId(), id);
+                tx = createTransaction(request, id);
+                transactions.put(id, tx);
             } else {
-                tx = createOpenTransaction(id);
-                LOG.debug("{}: allocated new open transaction {}", persistenceId(), id);
+                final Optional<TransactionSuccess<?>> maybeReplay = tx.replaySequence(request.getSequence());
+                if (maybeReplay.isPresent()) {
+                    final TransactionSuccess<?> replay = maybeReplay.get();
+                    LOG.debug("{}: envelope {} replaying response {}", persistenceId(), envelope, replay);
+                    return replay;
+                }
             }
+        }
 
-            transactions.put(id, tx);
-        } else {
-            final Optional<TransactionSuccess<?>> replay = tx.replaySequence(request.getSequence());
-            if (replay.isPresent()) {
-                return replay.get();
+        return tx.handleRequest(request, envelope, now);
+    }
+
+    private FrontendTransaction createTransaction(final TransactionRequest<?> request, final TransactionIdentifier id)
+            throws RequestException {
+        if (request instanceof CommitLocalTransactionRequest) {
+            LOG.debug("{}: allocating new ready transaction {}", persistenceId(), id);
+            return createReadyTransaction(id, ((CommitLocalTransactionRequest) request).getModification());
+        }
+        if (request instanceof AbstractReadTransactionRequest) {
+            if (((AbstractReadTransactionRequest<?>) request).isSnapshotOnly()) {
+                LOG.debug("{}: allocatint new open snapshot {}", persistenceId(), id);
+                return createOpenSnapshot(id);
             }
         }
 
-        return tx.handleRequest(request, envelope, now);
+        LOG.debug("{}: allocating new open transaction {}", persistenceId(), id);
+        return createOpenTransaction(id);
     }
 
+    abstract FrontendTransaction createOpenSnapshot(TransactionIdentifier id) throws RequestException;
+
     abstract FrontendTransaction createOpenTransaction(TransactionIdentifier id) throws RequestException;
 
     abstract FrontendTransaction createReadyTransaction(TransactionIdentifier id, DataTreeModification mod)
         throws RequestException;
 
-    abstract ShardDataTreeCohort createReadyCohort(final TransactionIdentifier id, final DataTreeModification mod);
+    abstract ShardDataTreeCohort createReadyCohort(TransactionIdentifier id, DataTreeModification mod);
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this).omitNullValues().add("identifier", getIdentifier())
+                .add("persistenceId", persistenceId).add("transactions", transactions).toString();
+    }
 }