southbound/southbound-impl/src/main/java/org/opendaylight/ovsdb/southbound/transactions/md/TransactionInvokerImpl.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   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
   9 package org.opendaylight.ovsdb.southbound.transactions.md;
  10
  11 import com.google.common.util.concurrent.FutureCallback;
  12 import com.google.common.util.concurrent.Futures;
  13 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  14 import java.util.ArrayList;
  15 import java.util.HashMap;
  16 import java.util.List;
  17 import java.util.Map;
  18 import java.util.concurrent.BlockingQueue;
  19 import java.util.concurrent.ExecutorService;
  20 import java.util.concurrent.Executors;
  21 import java.util.concurrent.LinkedBlockingQueue;
  22 import java.util.concurrent.ThreadFactory;
  23 import java.util.concurrent.TimeUnit;
  24 import java.util.concurrent.atomic.AtomicBoolean;
  25 import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;
  26 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  27 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  28 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
  29 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
  30 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34
  35 public class TransactionInvokerImpl implements TransactionInvoker,TransactionChainListener, Runnable, AutoCloseable {
  36     private static final Logger LOG = LoggerFactory.getLogger(TransactionInvokerImpl.class);
  37     private static final int QUEUE_SIZE = 10000;
  38     private BindingTransactionChain chain;
  39     private DataBroker db;
  40     private BlockingQueue<TransactionCommand> inputQueue = new LinkedBlockingQueue<>(QUEUE_SIZE);
  41     private BlockingQueue<ReadWriteTransaction> successfulTransactionQueue
  42         = new LinkedBlockingQueue<>(QUEUE_SIZE);
  43     private BlockingQueue<AsyncTransaction<?, ?>> failedTransactionQueue
  44         = new LinkedBlockingQueue<>(QUEUE_SIZE);
  45     private ExecutorService executor;
  46     private Map<ReadWriteTransaction,TransactionCommand> transactionToCommand
  47         = new HashMap<>();
  48     private List<ReadWriteTransaction> pendingTransactions = new ArrayList<>();
  49     private final AtomicBoolean runTask = new AtomicBoolean( true );
  50
  51     public TransactionInvokerImpl(DataBroker db) {
  52         this.db = db;
  53         this.chain = db.createTransactionChain(this);
  54         ThreadFactory threadFact = new ThreadFactoryBuilder().setNameFormat("transaction-invoker-impl-%d").build();
  55         executor = Executors.newSingleThreadExecutor(threadFact);
  56         executor.submit(this);
  57     }
  58
  59     @Override
  60     public void invoke(final TransactionCommand command) {
  61         // TODO what do we do if queue is full?
  62         inputQueue.offer(command);
  63     }
  64
  65     @Override
  66     public void onTransactionChainFailed(TransactionChain<?, ?> chain,
  67             AsyncTransaction<?, ?> transaction, Throwable cause) {
  68         failedTransactionQueue.offer(transaction);
  69     }
  70
  71     @Override
  72     public void onTransactionChainSuccessful(TransactionChain<?, ?> chain) {
  73         // NO OP
  74
  75     }
  76
  77     @Override
  78     public void run() {
  79         while (runTask.get()) {
  80             forgetSuccessfulTransactions();
  81             try {
  82                 List<TransactionCommand> commands = extractCommands();
  83                 for (TransactionCommand command: commands) {
  84                     final ReadWriteTransaction transaction = chain.newReadWriteTransaction();
  85                     recordPendingTransaction(command, transaction);
  86                     command.execute(transaction);
  87                     Futures.addCallback(transaction.submit(), new FutureCallback<Void>() {
  88                         @Override
  89                         public void onSuccess(final Void result) {
  90                             successfulTransactionQueue.offer(transaction);
  91                         }
  92
  93                         @Override
  94                         public void onFailure(final Throwable throwable) {
  95                             // NOOP - handled by failure of transaction chain
  96                         }
  97                     });
  98                 }
  99             } catch (Exception e) {
 100                 LOG.warn("Exception invoking Transaction: ", e);
 101             }
 102         }
 103     }
 104
 105     private List<TransactionCommand> extractResubmitCommands() {
 106         AsyncTransaction<?, ?> transaction = failedTransactionQueue.poll();
 107         List<TransactionCommand> commands = new ArrayList<>();
 108         if (transaction != null) {
 109             int index = pendingTransactions.lastIndexOf(transaction);
 110             List<ReadWriteTransaction> transactions =
 111                     pendingTransactions.subList(index, pendingTransactions.size() - 1);
 112             for (ReadWriteTransaction tx: transactions) {
 113                 commands.add(transactionToCommand.get(tx));
 114             }
 115             resetTransactionQueue();
 116         }
 117         return commands;
 118     }
 119
 120     private void resetTransactionQueue() {
 121         chain.close();
 122         chain = db.createTransactionChain(this);
 123         pendingTransactions = new ArrayList<>();
 124         transactionToCommand = new HashMap<>();
 125         failedTransactionQueue.clear();
 126         successfulTransactionQueue.clear();
 127     }
 128
 129     private void recordPendingTransaction(TransactionCommand command,
 130             final ReadWriteTransaction transaction) {
 131         transactionToCommand.put(transaction, command);
 132         pendingTransactions.add(transaction);
 133     }
 134
 135     private List<TransactionCommand> extractCommands() throws InterruptedException {
 136         List<TransactionCommand> commands = extractResubmitCommands();
 137         commands.addAll(extractCommandsFromQueue());
 138         return commands;
 139     }
 140
 141     private List<TransactionCommand> extractCommandsFromQueue() throws InterruptedException {
 142         List<TransactionCommand> result = new ArrayList<>();
 143         TransactionCommand command = inputQueue.take();
 144         while (command != null) {
 145             result.add(command);
 146             command = inputQueue.poll();
 147         }
 148         return result;
 149     }
 150
 151     private void forgetSuccessfulTransactions() {
 152         ReadWriteTransaction transaction = successfulTransactionQueue.poll();
 153         while (transaction != null) {
 154             pendingTransactions.remove(transaction);
 155             transactionToCommand.remove(transaction);
 156             transaction = successfulTransactionQueue.poll();
 157         }
 158     }
 159
 160     @Override
 161     public void close() throws Exception {
 162         this.executor.shutdown();
 163         if (!this.executor.awaitTermination(1, TimeUnit.SECONDS)) {
 164             runTask.set(false);
 165             this.executor.shutdownNow();
 166         }
 167     }
 168 }