gerrit.fd Code Review - hc2vpp.git/blob

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package io.fd.honeycomb.v3po.translate.impl.write;
  18
  19 import static com.google.common.base.Preconditions.checkArgument;
  20
  21 import com.google.common.base.Optional;
  22 import com.google.common.collect.Lists;
  23 import io.fd.honeycomb.v3po.translate.impl.TraversalType;
  24 import io.fd.honeycomb.v3po.translate.util.RWUtils;
  25 import io.fd.honeycomb.v3po.translate.write.ChildWriter;
  26 import io.fd.honeycomb.v3po.translate.write.WriteContext;
  27 import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
  28 import io.fd.honeycomb.v3po.translate.write.Writer;
  29 import java.util.ArrayList;
  30 import java.util.Collection;
  31 import java.util.Collections;
  32 import java.util.List;
  33 import java.util.Map;
  34 import javax.annotation.Nonnull;
  35 import javax.annotation.Nullable;
  36 import org.opendaylight.yangtools.yang.binding.Augmentation;
  37 import org.opendaylight.yangtools.yang.binding.ChildOf;
  38 import org.opendaylight.yangtools.yang.binding.DataObject;
  39 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  40 import org.slf4j.Logger;
  41 import org.slf4j.LoggerFactory;
  42
  43 public abstract class AbstractCompositeWriter<D extends DataObject> implements Writer<D> {
  44
  45     private static final Logger LOG = LoggerFactory.getLogger(AbstractCompositeWriter.class);
  46
  47     private final Map<Class<? extends DataObject>, ChildWriter<? extends ChildOf<D>>> childWriters;
  48     private final Map<Class<? extends DataObject>, ChildWriter<? extends Augmentation<D>>> augWriters;
  49     private final InstanceIdentifier<D> instanceIdentifier;
  50     private TraversalType traversalType;
  51
  52     public AbstractCompositeWriter(final Class<D> type,
  53                                    final List<ChildWriter<? extends ChildOf<D>>> childWriters,
  54                                    final List<ChildWriter<? extends Augmentation<D>>> augWriters,
  55                                    final TraversalType traversalType) {
  56         this.traversalType = traversalType;
  57         this.instanceIdentifier = InstanceIdentifier.create(type);
  58         this.childWriters = RWUtils.uniqueLinkedIndex(childWriters, RWUtils.MANAGER_CLASS_FUNCTION);
  59         this.augWriters = RWUtils.uniqueLinkedIndex(augWriters, RWUtils.MANAGER_CLASS_AUG_FUNCTION);
  60     }
  61
  62     protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
  63         throws WriteFailedException {
  64         LOG.debug("{}: Writing current: {} data: {}", this, id, data);
  65
  66         switch (traversalType) {
  67             case PREORDER: {
  68                 LOG.trace("{}: Writing current attributes", this);
  69                 writeCurrentAttributes(id, data, ctx);
  70                 writeChildren(id, data, ctx);
  71                 break;
  72             }
  73             case POSTORDER: {
  74                 writeChildren(id, data, ctx);
  75                 LOG.trace("{}: Writing current attributes", this);
  76                 writeCurrentAttributes(id, data, ctx);
  77                 break;
  78             }
  79         }
  80
  81         LOG.debug("{}: Current node written successfully", this);
  82     }
  83
  84     private void writeChildren(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
  85         throws WriteFailedException {
  86         for (ChildWriter<? extends ChildOf<D>> child : childWriters.values()) {
  87             LOG.debug("{}: Writing child in: {}", this, child);
  88             child.writeChild(id, data, ctx);
  89         }
  90
  91         for (ChildWriter<? extends Augmentation<D>> child : augWriters.values()) {
  92             LOG.debug("{}: Writing augment in: {}", this, child);
  93             child.writeChild(id, data, ctx);
  94         }
  95     }
  96
  97     protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
  98                                  final WriteContext ctx) throws WriteFailedException {
  99         LOG.debug("{}: Updating current: {} dataBefore: {}, datAfter: {}", this, id, dataBefore, dataAfter);
 100
 101         if (dataBefore.equals(dataAfter)) {
 102             LOG.debug("{}: Skipping current(no update): {}", this, id);
 103             // No change, ignore
 104             return;
 105         }
 106
 107         switch (traversalType) {
 108             case PREORDER: {
 109                 LOG.trace("{}: Updating current attributes", this);
 110                 updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
 111                 updateChildren(id, dataBefore, dataAfter, ctx);
 112                 break;
 113             }
 114             case POSTORDER: {
 115                 updateChildren(id, dataBefore, dataAfter, ctx);
 116                 LOG.trace("{}: Updating current attributes", this);
 117                 updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
 118                 break;
 119             }
 120         }
 121
 122         LOG.debug("{}: Current node updated successfully", this);
 123     }
 124
 125     private void updateChildren(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
 126                                 final WriteContext ctx) throws WriteFailedException {
 127         for (ChildWriter<? extends ChildOf<D>> child : childWriters.values()) {
 128             LOG.debug("{}: Updating child in: {}", this, child);
 129             child.updateChild(id, dataBefore, dataAfter, ctx);
 130         }
 131
 132         for (ChildWriter<? extends Augmentation<D>> child : augWriters.values()) {
 133             LOG.debug("{}: Updating augment in: {}", this, child);
 134             child.updateChild(id, dataBefore, dataAfter, ctx);
 135         }
 136     }
 137
 138     protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
 139         throws WriteFailedException {
 140         LOG.debug("{}: Deleting current: {} dataBefore: {}", this, id, dataBefore);
 141
 142         switch (traversalType) {
 143             case PREORDER: {
 144                 deleteChildren(id, dataBefore, ctx);
 145                 LOG.trace("{}: Deleting current attributes", this);
 146                 deleteCurrentAttributes(id, dataBefore, ctx);
 147                 break;
 148             }
 149             case POSTORDER: {
 150                 LOG.trace("{}: Deleting current attributes", this);
 151                 deleteCurrentAttributes(id, dataBefore, ctx);
 152                 deleteChildren(id, dataBefore, ctx);
 153                 break;
 154             }
 155         }
 156     }
 157
 158     private void deleteChildren(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
 159         throws WriteFailedException {
 160         for (ChildWriter<? extends Augmentation<D>> child : reverseCollection(augWriters.values())) {
 161             LOG.debug("{}: Deleting augment in: {}", this, child);
 162             child.deleteChild(id, dataBefore, ctx);
 163         }
 164
 165         for (ChildWriter<? extends ChildOf<D>> child : reverseCollection(childWriters.values())) {
 166             LOG.debug("{}: Deleting child in: {}", this, child);
 167             child.deleteChild(id, dataBefore, ctx);
 168         }
 169     }
 170
 171     @SuppressWarnings("unchecked")
 172     @Override
 173     public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
 174                        @Nullable final DataObject dataBefore,
 175                        @Nullable final DataObject dataAfter,
 176                        @Nonnull final WriteContext ctx) throws WriteFailedException {
 177         LOG.debug("{}: Updating : {}", this, id);
 178         LOG.trace("{}: Updating : {}, from: {} to: {}", this, id, dataBefore, dataAfter);
 179
 180         if (idPointsToCurrent(id)) {
 181             if(isWrite(dataBefore, dataAfter)) {
 182                 writeCurrent((InstanceIdentifier<D>) id, castToManaged(dataAfter), ctx);
 183             } else if(isDelete(dataBefore, dataAfter)) {
 184                 deleteCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), ctx);
 185             } else {
 186                 checkArgument(dataBefore != null && dataAfter != null, "No data to process");
 187                 updateCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), castToManaged(dataAfter), ctx);
 188             }
 189         } else {
 190             if (isWrite(dataBefore, dataAfter)) {
 191                 writeSubtree(id, dataAfter, ctx);
 192             } else if (isDelete(dataBefore, dataAfter)) {
 193                 deleteSubtree(id, dataBefore, ctx);
 194             } else {
 195                 checkArgument(dataBefore != null && dataAfter != null, "No data to process");
 196                 updateSubtree(id, dataBefore, dataAfter, ctx);
 197             }
 198         }
 199     }
 200
 201     private void checkDataType(final @Nullable DataObject dataAfter) {
 202         checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(dataAfter.getClass()));
 203     }
 204
 205     private D castToManaged(final DataObject data) {
 206         checkDataType(data);
 207         return getManagedDataObjectType().getTargetType().cast(data);
 208     }
 209
 210     private static boolean isWrite(final DataObject dataBefore,
 211                                     final DataObject dataAfter) {
 212         return dataBefore == null && dataAfter != null;
 213     }
 214
 215     private static boolean isDelete(final DataObject dataBefore,
 216                                     final DataObject dataAfter) {
 217         return dataAfter == null && dataBefore != null;
 218     }
 219
 220     private void writeSubtree(final InstanceIdentifier<? extends DataObject> id,
 221                               final DataObject dataAfter, final WriteContext ctx) throws WriteFailedException {
 222         LOG.debug("{}: Writing subtree: {}", this, id);
 223         final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
 224
 225         if (writer != null) {
 226             LOG.debug("{}: Writing subtree: {} in: {}", this, id, writer);
 227             writer.update(id, null, dataAfter, ctx);
 228         } else {
 229             // If there's no dedicated writer, use write current
 230             // But we need current data after to do so
 231             final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
 232             Optional<DataObject> currentDataAfter = ctx.readAfter(currentId);
 233             LOG.debug("{}: Dedicated subtree writer missing for: {}. Writing current.", this,
 234                 RWUtils.getNextId(id, getManagedDataObjectType()).getType(), currentDataAfter);
 235             writeCurrent(currentId, castToManaged(currentDataAfter.get()), ctx);
 236         }
 237     }
 238
 239     private boolean idPointsToCurrent(final @Nonnull InstanceIdentifier<? extends DataObject> id) {
 240         return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
 241     }
 242
 243     private void deleteSubtree(final InstanceIdentifier<? extends DataObject> id,
 244                                final DataObject dataBefore, final WriteContext ctx) throws WriteFailedException {
 245         LOG.debug("{}: Deleting subtree: {}", this, id);
 246         final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
 247
 248         if (writer != null) {
 249             LOG.debug("{}: Deleting subtree: {} in: {}", this, id, writer);
 250             writer.update(id, dataBefore, null, ctx);
 251         } else {
 252             updateSubtreeFromCurrent(id, ctx);
 253         }
 254     }
 255
 256     @SuppressWarnings("unchecked")
 257     private void updateSubtreeFromCurrent(final InstanceIdentifier<? extends DataObject> id, final WriteContext ctx)
 258         throws WriteFailedException {
 259         final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
 260         Optional<DataObject> currentDataBefore = ctx.readBefore(currentId);
 261         Optional<DataObject> currentDataAfter = ctx.readAfter(currentId);
 262         LOG.debug("{}: Dedicated subtree writer missing for: {}. Updating current without subtree", this,
 263             RWUtils.getNextId(id, getManagedDataObjectType()).getType(), currentDataAfter);
 264         updateCurrent((InstanceIdentifier<D>) id, castToManaged(currentDataBefore.orNull()),
 265             castToManaged(currentDataAfter.orNull()), ctx);
 266     }
 267
 268     private void updateSubtree(final InstanceIdentifier<? extends DataObject> id,
 269                                final DataObject dataBefore,
 270                                final DataObject dataAfter,
 271                                final WriteContext ctx) throws WriteFailedException {
 272         LOG.debug("{}: Updating subtree: {}", this, id);
 273         final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
 274
 275         if (writer != null) {
 276             LOG.debug("{}: Updating subtree: {} in: {}", this, id, writer);
 277             writer.update(id, dataBefore, dataAfter, ctx);
 278         } else {
 279             updateSubtreeFromCurrent(id, ctx);
 280         }
 281     }
 282
 283     private Writer<? extends ChildOf<D>> getNextWriter(final InstanceIdentifier<? extends DataObject> id) {
 284         final Class<? extends DataObject> next = RWUtils.getNextId(id, getManagedDataObjectType()).getType();
 285         return childWriters.get(next);
 286     }
 287
 288     private static <T> List<T> reverseCollection(final Collection<T> original) {
 289         // TODO find a better reverse mechanism (probably a different collection for child writers is necessary)
 290         final ArrayList<T> list = Lists.newArrayList(original);
 291         Collections.reverse(list);
 292         return list;
 293     }
 294
 295     protected abstract void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 296                                                    @Nonnull final D data,
 297                                                    @Nonnull final WriteContext ctx) throws WriteFailedException;
 298
 299     protected abstract void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 300                                                     @Nonnull final D dataBefore,
 301                                                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 302
 303     protected abstract void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 304                                                     @Nonnull final D dataBefore,
 305                                                     @Nonnull final D dataAfter,
 306                                                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 307
 308     @Nonnull
 309     @Override
 310     public InstanceIdentifier<D> getManagedDataObjectType() {
 311         return instanceIdentifier;
 312     }
 313
 314
 315     @Override
 316     public String toString() {
 317         return String.format("Writer[%s]", getManagedDataObjectType().getTargetType().getSimpleName());
 318     }
 319 }