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.base.Optional;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13 import com.google.common.util.concurrent.FutureCallback;
  14 import com.google.common.util.concurrent.Futures;
  15 import com.google.common.util.concurrent.ListenableFuture;
  16
  17 import java.util.concurrent.CountDownLatch;
  18 import java.util.concurrent.Executors;
  19 import java.util.concurrent.ScheduledExecutorService;
  20 import java.util.concurrent.TimeUnit;
  21 import java.util.concurrent.atomic.AtomicBoolean;
  22 import javax.annotation.Nullable;
  23
  24 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  25 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  26 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  27 import org.opendaylight.yangtools.yang.binding.DataObject;
  28 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /**
  33  * Represents read-write transaction on netconf device.
  34  * This transaction can be obtained by {@link DeviceTransactionManager}.
  35  *
  36  * <p>
  37  * WARNING: Only one transaction can be opened at the same time on device!
  38  * It's important to close (cancel/submit) transaction when work is done with it
  39  * (so others can access the device).
  40  * </p>
  41  */
  42 public class DeviceTransaction {
  43
  44     private static final Logger LOG = LoggerFactory.getLogger(DeviceTransaction.class);
  45
  46     private final ReadWriteTransaction rwTx;
  47     private final CountDownLatch deviceLock;
  48     private final ScheduledExecutorService scheduledExecutorService;
  49     private final AtomicBoolean wasSubmittedOrCancelled = new AtomicBoolean(false);
  50
  51     DeviceTransaction(ReadWriteTransaction rwTx, CountDownLatch deviceLock) {
  52         this.rwTx = rwTx;
  53         this.deviceLock = deviceLock;
  54         this.scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
  55         LOG.debug("Device transaction created. Lock: {}", deviceLock);
  56     }
  57
  58     public <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(LogicalDatastoreType store,
  59             InstanceIdentifier<T> path) {
  60         return rwTx.read(store, path);
  61     }
  62
  63     public <T extends DataObject> void put(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
  64         rwTx.put(store, path, data);
  65     }
  66
  67     public <T extends DataObject> void put(LogicalDatastoreType store, InstanceIdentifier<T> path, T data,
  68             boolean createMissingParents) {
  69         rwTx.put(store, path, data, createMissingParents);
  70     }
  71
  72     public <T extends DataObject> void merge(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
  73         rwTx.merge(store, path, data);
  74     }
  75
  76     public <T extends DataObject> void merge(LogicalDatastoreType store, InstanceIdentifier<T> path, T data,
  77             boolean createMissingParents) {
  78         rwTx.merge(store, path, data, createMissingParents);
  79     }
  80
  81     public void delete(LogicalDatastoreType store, InstanceIdentifier<?> path) {
  82         rwTx.delete(store, path);
  83     }
  84
  85     /**
  86      * Cancels transaction and unlocks it.
  87      * @return true if cancel was successful.
  88      */
  89     public boolean cancel() {
  90         if (wasSubmittedOrCancelled.get()) {
  91             LOG.warn("Transaction was already submitted or canceled!");
  92             return false;
  93         }
  94
  95         LOG.debug("Transaction cancelled. Lock: {}", deviceLock);
  96         wasSubmittedOrCancelled.set(true);
  97         afterClose();
  98         return rwTx.cancel();
  99     }
 100
 101     /**
 102      * Submits data changed in transaction to device with defined timeout to submit. If time from timeout runs out then
 103      * submit will be interrupted and device will be unlocked.
 104      *
 105      * @param timeout a timeout
 106      * @param timeUnit a time unit
 107      * @return ListenableFuture which indicates when is submit completed.
 108      */
 109     public ListenableFuture<Void> submit(long timeout, TimeUnit timeUnit) {
 110         if (wasSubmittedOrCancelled.get()) {
 111             String msg = "Transaction was already submitted or canceled!";
 112             LOG.error(msg);
 113             return Futures.immediateFailedFuture(new IllegalStateException(msg));
 114         }
 115
 116         LOG.debug("Transaction submitted. Lock: {}", deviceLock);
 117         wasSubmittedOrCancelled.set(true);
 118         ListenableFuture<Void> future =
 119                 Futures.withTimeout(rwTx.submit(), timeout, timeUnit, scheduledExecutorService);
 120
 121         Futures.addCallback(future, new FutureCallback<Void>() {
 122             @Override
 123             public void onSuccess(@Nullable Void result) {
 124                 LOG.debug("Transaction with lock {} successfully submitted.", deviceLock);
 125                 afterClose();
 126             }
 127
 128             @Override
 129             public void onFailure(Throwable throwable) {
 130                 LOG.error("Device transaction submit failed or submit took longer than {} {}!"
 131                         + " Unlocking device.", timeout, timeUnit, throwable);
 132                 afterClose();
 133             }
 134         }, scheduledExecutorService);
 135         return future;
 136     }
 137
 138     /**
 139      * Returns state of transaction.
 140      * @return true if transaction was closed; otherwise false
 141      */
 142     public AtomicBoolean wasSubmittedOrCancelled() {
 143         return wasSubmittedOrCancelled;
 144     }
 145
 146     private void afterClose() {
 147         scheduledExecutorService.shutdown();
 148         deviceLock.countDown();
 149     }
 150 }