common/src/main/java/org/opendaylight/transportpce/common/device/DeviceTransaction.java

   1 /*
   2  * Copyright © 2017 Orange, 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.transportpce.common.device;
  10
  11 import com.google.common.util.concurrent.FluentFuture;
  12 import com.google.common.util.concurrent.FutureCallback;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import java.util.Optional;
  15 import java.util.concurrent.CountDownLatch;
  16 import java.util.concurrent.Executors;
  17 import java.util.concurrent.ScheduledExecutorService;
  18 import java.util.concurrent.TimeUnit;
  19 import java.util.concurrent.atomic.AtomicBoolean;
  20 import org.eclipse.jdt.annotation.NonNull;
  21 import org.opendaylight.mdsal.binding.api.ReadWriteTransaction;
  22 import org.opendaylight.mdsal.common.api.CommitInfo;
  23 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  24 import org.opendaylight.yangtools.util.concurrent.FluentFutures;
  25 import org.opendaylight.yangtools.yang.binding.DataObject;
  26 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 /**
  31  * Represents read-write transaction on netconf device.
  32  * This transaction can be obtained by {@link DeviceTransactionManager}.
  33  *
  34  * <p>
  35  * WARNING: Only one transaction can be opened at the same time on device!
  36  * It's important to close (cancel/submit) transaction when work is done with it
  37  * (so others can access the device).
  38  * </p>
  39  */
  40 public class DeviceTransaction {
  41
  42     private static final Logger LOG = LoggerFactory.getLogger(DeviceTransaction.class);
  43
  44     private final ReadWriteTransaction rwTx;
  45     private final CountDownLatch deviceLock;
  46     private final ScheduledExecutorService scheduledExecutorService;
  47     private final AtomicBoolean wasSubmittedOrCancelled = new AtomicBoolean(false);
  48
  49     DeviceTransaction(ReadWriteTransaction rwTx, CountDownLatch deviceLock) {
  50         this.rwTx = rwTx;
  51         this.deviceLock = deviceLock;
  52         this.scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
  53         LOG.debug("Device transaction created. Lock: {}", deviceLock);
  54     }
  55
  56     public <T extends DataObject> ListenableFuture<Optional<T>> read(LogicalDatastoreType store,
  57             InstanceIdentifier<T> path) {
  58         return rwTx.read(store, path);
  59     }
  60
  61     public <T extends DataObject> void put(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
  62         rwTx.put(store, path, data);
  63     }
  64
  65     public <T extends DataObject> void merge(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
  66         rwTx.merge(store, path, data);
  67     }
  68
  69
  70     public void delete(LogicalDatastoreType store, InstanceIdentifier<?> path) {
  71         rwTx.delete(store, path);
  72     }
  73
  74     /**
  75      * Cancels transaction and unlocks it.
  76      * @return true if cancel was successful.
  77      */
  78     public boolean cancel() {
  79         if (wasSubmittedOrCancelled.get()) {
  80             LOG.warn("Transaction was already submitted or canceled!");
  81             return false;
  82         }
  83
  84         LOG.debug("Transaction cancelled. Lock: {}", deviceLock);
  85         wasSubmittedOrCancelled.set(true);
  86         afterClose();
  87         return rwTx.cancel();
  88     }
  89
  90     /**
  91      * Submits data changed in transaction to device with defined timeout to commit. If time from timeout runs out then
  92      * the commit will be interrupted and the device will be unlocked.
  93      *
  94      * @param timeout a timeout
  95      * @param timeUnit a time unit
  96      * @return FluentFuture which indicates when the commit is completed.
  97      */
  98     public FluentFuture<? extends @NonNull CommitInfo> commit(long timeout, TimeUnit timeUnit) {
  99         if (wasSubmittedOrCancelled.get()) {
 100             String msg = "Transaction was already submitted or canceled!";
 101             LOG.error(msg);
 102             return FluentFutures.immediateFailedFluentFuture(new IllegalStateException(msg));
 103         }
 104
 105         LOG.debug("Transaction committed. Lock: {}", deviceLock);
 106         wasSubmittedOrCancelled.set(true);
 107         FluentFuture<? extends @NonNull CommitInfo> future =
 108                 rwTx.commit().withTimeout(timeout, timeUnit, scheduledExecutorService);
 109
 110         future.addCallback(new FutureCallback<CommitInfo>() {
 111             @Override
 112             public void onSuccess(CommitInfo result) {
 113                 LOG.debug("Transaction with lock {} successfully committed: {}", deviceLock, result);
 114                 afterClose();
 115             }
 116
 117             @Override
 118             public void onFailure(Throwable throwable) {
 119                 LOG.error("Device transaction commit failed or submit took longer than {} {}! Unlocking device.",
 120                     timeout, timeUnit, throwable);
 121                 afterClose();
 122             }
 123         }, scheduledExecutorService);
 124         return future;
 125     }
 126
 127     /**
 128      * Returns state of transaction.
 129      * @return true if transaction was closed; otherwise false
 130      */
 131     public AtomicBoolean wasSubmittedOrCancelled() {
 132         return wasSubmittedOrCancelled;
 133     }
 134
 135     private void afterClose() {
 136         scheduledExecutorService.shutdown();
 137         deviceLock.countDown();
 138     }
 139 }