Merge "Improve performance of XmlElement.getName"

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionChainProxy.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionChainProxy.java
index 20a74e30dab07258b4a4122d56d0b7f6c7630f1d..cf261cbd2af103b70f3dfce9885903a88ee293e6 100644 (file)
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionChainProxy.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionChainProxy.java
@@ -1,31 +1,135 @@
+/*
+ * Copyright (c) 2014 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 java.util.Collections;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionChain;
+import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
+import org.opendaylight.controller.md.sal.common.api.data.TransactionChainClosedException;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionChain;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
+import scala.concurrent.Future;
 
 /**
  * TransactionChainProxy acts as a proxy for a DOMStoreTransactionChain created on a remote shard
  */
-public class TransactionChainProxy implements DOMStoreTransactionChain{
+public class TransactionChainProxy implements DOMStoreTransactionChain {
+
+    private interface State {
+        boolean isReady();
+
+        List<Future<Object>> getPreviousReadyFutures();
+    }
+
+    private static class Allocated implements State {
+        private final ChainedTransactionProxy transaction;
+
+        Allocated(ChainedTransactionProxy transaction) {
+            this.transaction = transaction;
+        }
+
+        @Override
+        public boolean isReady() {
+            return transaction.isReady();
+        }
+
+        @Override
+        public List<Future<Object>> getPreviousReadyFutures() {
+            return transaction.getReadyFutures();
+        }
+    }
+
+    private static abstract class AbstractDefaultState implements State {
+        @Override
+        public List<Future<Object>> getPreviousReadyFutures() {
+            return Collections.emptyList();
+        }
+    }
+
+    private static final State IDLE_STATE = new AbstractDefaultState() {
+        @Override
+        public boolean isReady() {
+            return true;
+        }
+    };
+
+    private static final State CLOSED_STATE = new AbstractDefaultState() {
+        @Override
+        public boolean isReady() {
+            throw new TransactionChainClosedException("Transaction chain has been closed");
+        }
+    };
+
+    private static final AtomicInteger counter = new AtomicInteger(0);
+
+    private final ActorContext actorContext;
+    private final String transactionChainId;
+    private volatile State currentState = IDLE_STATE;
+
+    public TransactionChainProxy(ActorContext actorContext) {
+        this.actorContext = actorContext;
+        transactionChainId = actorContext.getCurrentMemberName() + "-txn-chain-" + counter.incrementAndGet();
+    }
+
+    public String getTransactionChainId() {
+        return transactionChainId;
+    }
+
     @Override
     public DOMStoreReadTransaction newReadOnlyTransaction() {
-        throw new UnsupportedOperationException("newReadOnlyTransaction");
+        State localState = currentState;
+        checkReadyState(localState);
+
+        return new ChainedTransactionProxy(actorContext, TransactionProxy.TransactionType.READ_ONLY,
+                transactionChainId, localState.getPreviousReadyFutures());
     }
 
     @Override
     public DOMStoreReadWriteTransaction newReadWriteTransaction() {
-        throw new UnsupportedOperationException("newReadWriteTransaction");
+        actorContext.acquireTxCreationPermit();
+        return allocateWriteTransaction(TransactionProxy.TransactionType.READ_WRITE);
     }
 
     @Override
     public DOMStoreWriteTransaction newWriteOnlyTransaction() {
-        throw new UnsupportedOperationException("newWriteOnlyTransaction");
+        actorContext.acquireTxCreationPermit();
+        return allocateWriteTransaction(TransactionProxy.TransactionType.WRITE_ONLY);
     }
 
     @Override
     public void close() {
-        throw new UnsupportedOperationException("close");
+        currentState = CLOSED_STATE;
+
+        // Send a close transaction chain request to each and every shard
+        actorContext.broadcast(new CloseTransactionChain(transactionChainId).toSerializable());
+    }
+
+    private ChainedTransactionProxy allocateWriteTransaction(TransactionProxy.TransactionType type) {
+        State localState = currentState;
+
+        checkReadyState(localState);
+
+        // Pass the ready Futures from the previous Tx.
+        ChainedTransactionProxy txProxy = new ChainedTransactionProxy(actorContext, type,
+                transactionChainId, localState.getPreviousReadyFutures());
+
+        currentState = new Allocated(txProxy);
+
+        return txProxy;
+    }
+
+    private void checkReadyState(State state) {
+        Preconditions.checkState(state.isReady(), "Previous transaction is not ready yet");
     }
 }