mdsalutil/mdsalutil-api/src/main/java/org/opendaylight/genius/datastoreutils/AsyncDataTreeChangeListenerBase.java

   1 /*
   2  * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. 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.genius.datastoreutils;
  10
  11 import com.google.common.base.Preconditions;
  12 import java.util.Collection;
  13 import java.util.concurrent.LinkedBlockingQueue;
  14 import java.util.concurrent.ThreadPoolExecutor;
  15 import java.util.concurrent.TimeUnit;
  16 import javax.annotation.PostConstruct;
  17 import javax.annotation.PreDestroy;
  18 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  19 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  20 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
  21 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  22 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  23 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  24 import org.opendaylight.genius.infra.ThreadFactoryProvider;
  25 import org.opendaylight.genius.utils.SuperTypeUtil;
  26 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  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 @Deprecated
  33 public abstract class AsyncDataTreeChangeListenerBase<T extends DataObject, K extends DataTreeChangeListener<T>>
  34         implements DataTreeChangeListener<T>, ChainableDataTreeChangeListener<T>, AutoCloseable {
  35
  36     private static final Logger LOG = LoggerFactory.getLogger(AsyncDataTreeChangeListenerBase.class);
  37
  38     private static final int DATATREE_CHANGE_HANDLER_THREAD_POOL_CORE_SIZE = 1;
  39     private static final int DATATREE_CHANGE_HANDLER_THREAD_POOL_MAX_SIZE = 1;
  40     private static final int DATATREE_CHANGE_HANDLER_THREAD_POOL_KEEP_ALIVE_TIME_SECS = 300;
  41
  42     private ListenerRegistration<K> listenerRegistration;
  43     private final ChainableDataTreeChangeListenerImpl<T> chainingDelegate = new ChainableDataTreeChangeListenerImpl<>();
  44
  45     private final ThreadPoolExecutor dataTreeChangeHandlerExecutor = new ThreadPoolExecutor(
  46             DATATREE_CHANGE_HANDLER_THREAD_POOL_CORE_SIZE,
  47             DATATREE_CHANGE_HANDLER_THREAD_POOL_MAX_SIZE,
  48             DATATREE_CHANGE_HANDLER_THREAD_POOL_KEEP_ALIVE_TIME_SECS,
  49             TimeUnit.SECONDS,
  50             new LinkedBlockingQueue<>(),
  51             ThreadFactoryProvider.builder()
  52                 .namePrefix("AsyncDataTreeChangeListenerBase-DataTreeChangeHandler")
  53                 .logger(LOG)
  54                 .build().get());
  55
  56     protected final Class<T> clazz;
  57
  58     protected AsyncDataTreeChangeListenerBase() {
  59         this.clazz = SuperTypeUtil.getTypeParameter(getClass(), 0);
  60     }
  61
  62     @Deprecated
  63     public AsyncDataTreeChangeListenerBase(Class<T> clazz, Class<K> eventClazz) {
  64         this.clazz = Preconditions.checkNotNull(clazz, "Class can not be null!");
  65     }
  66
  67     @Override
  68     public void addBeforeListener(DataTreeChangeListener<T> listener) {
  69         chainingDelegate.addBeforeListener(listener);
  70     }
  71
  72     @Override
  73     public void addAfterListener(DataTreeChangeListener<T> listener) {
  74         chainingDelegate.addAfterListener(listener);
  75     }
  76
  77     @Override
  78     public void onDataTreeChanged(Collection<DataTreeModification<T>> changes) {
  79         if (changes == null || changes.isEmpty()) {
  80             return;
  81         }
  82
  83         DataTreeChangeHandler dataTreeChangeHandler = new DataTreeChangeHandler(changes);
  84         dataTreeChangeHandlerExecutor.execute(dataTreeChangeHandler);
  85     }
  86
  87     public void registerListener(LogicalDatastoreType dsType, final DataBroker db) {
  88         final DataTreeIdentifier<T> treeId = new DataTreeIdentifier<>(dsType, getWildCardPath());
  89         listenerRegistration = db.registerDataTreeChangeListener(treeId, getDataTreeChangeListener());
  90     }
  91
  92     /**
  93      * Subclasses override this and place initialization logic here, notably
  94      * calls to registerListener(). Note that the overriding method MUST repeat
  95      * the PostConstruct annotation, because JSR 250 specifies that lifecycle
  96      * methods "are called unless a subclass of the declaring class overrides
  97      * the method without repeating the annotation".  (The blueprint-maven-plugin
  98      * would gen. XML which calls PostConstruct annotated methods even if they are
  99      * in a subclass without repeating the annotation, but this is wrong and not
 100      * JSR 250 compliant, and while working in BP, then causes issues e.g. when
 101      * wiring with Guice for tests, so do always repeat it.)
 102      */
 103     @PostConstruct
 104     protected void init() {
 105     }
 106
 107     @Override
 108     @PreDestroy
 109     public void close() {
 110         if (listenerRegistration != null) {
 111             try {
 112                 listenerRegistration.close();
 113             } finally {
 114                 listenerRegistration = null;
 115             }
 116         }
 117     }
 118
 119     protected abstract InstanceIdentifier<T> getWildCardPath();
 120
 121     protected abstract void remove(InstanceIdentifier<T> key, T dataObjectModification);
 122
 123     protected abstract void update(InstanceIdentifier<T> key,
 124             T dataObjectModificationBefore, T dataObjectModificationAfter);
 125
 126     protected abstract void add(InstanceIdentifier<T> key, T dataObjectModification);
 127
 128     protected abstract K getDataTreeChangeListener();
 129
 130     public class DataTreeChangeHandler implements Runnable {
 131         private final Collection<DataTreeModification<T>> changes;
 132
 133         public DataTreeChangeHandler(Collection<DataTreeModification<T>> changes) {
 134             chainingDelegate.notifyBeforeOnDataTreeChanged(changes);
 135             this.changes = changes;
 136         }
 137
 138         @Override
 139         public void run() {
 140             for (DataTreeModification<T> change : changes) {
 141                 final InstanceIdentifier<T> key = change.getRootPath().getRootIdentifier();
 142                 final DataObjectModification<T> mod = change.getRootNode();
 143
 144                 switch (mod.getModificationType()) {
 145                     case DELETE:
 146                         remove(key, mod.getDataBefore());
 147                         break;
 148                     case SUBTREE_MODIFIED:
 149                         update(key, mod.getDataBefore(), mod.getDataAfter());
 150                         break;
 151                     case WRITE:
 152                         if (mod.getDataBefore() == null) {
 153                             add(key, mod.getDataAfter());
 154                         } else {
 155                             update(key, mod.getDataBefore(), mod.getDataAfter());
 156                         }
 157                         break;
 158                     default:
 159                         // FIXME: May be not a good idea to throw.
 160                         throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
 161                 }
 162             }
 163             chainingDelegate.notifyAfterOnDataTreeChanged(changes);
 164         }
 165     }
 166 }