2 * Copyright (c) 2014, 2015 Cisco Systems, Inc. and others. All rights reserved.
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
9 package org.opendaylight.controller.cluster.datastore.node.utils.stream;
11 import com.google.common.base.Preconditions;
12 import java.io.DataOutput;
13 import java.io.DataOutputStream;
14 import java.io.IOException;
15 import java.io.OutputStream;
16 import java.nio.charset.StandardCharsets;
17 import java.util.Collection;
18 import java.util.HashMap;
21 import org.opendaylight.yangtools.yang.common.QName;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
24 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
25 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
26 import org.slf4j.Logger;
27 import org.slf4j.LoggerFactory;
30 * NormalizedNodeOutputStreamWriter will be used by distributed datastore to send normalized node in
32 * A stream writer wrapper around this class will write node objects to stream in recursive manner.
33 * for example - If you have a ContainerNode which has a two LeafNode as children, then
34 * you will first call {@link #startContainerNode(YangInstanceIdentifier.NodeIdentifier, int)}, then will call
35 * {@link #leafNode(YangInstanceIdentifier.NodeIdentifier, Object)} twice and then, {@link #endNode()} to end
38 * Based on the each node, the node type is also written to the stream, that helps in reconstructing the object,
44 public class NormalizedNodeOutputStreamWriter implements NormalizedNodeStreamWriter {
46 private static final Logger LOG = LoggerFactory.getLogger(NormalizedNodeOutputStreamWriter.class);
48 static final byte SIGNATURE_MARKER = (byte) 0xab;
49 static final short CURRENT_VERSION = (short) 1;
51 static final byte IS_CODE_VALUE = 1;
52 static final byte IS_STRING_VALUE = 2;
53 static final byte IS_NULL_VALUE = 3;
55 private final DataOutput output;
57 private final Map<String, Integer> stringCodeMap = new HashMap<>();
59 private NormalizedNodeWriter normalizedNodeWriter;
61 private boolean wroteSignatureMarker;
63 public NormalizedNodeOutputStreamWriter(OutputStream stream) throws IOException {
64 Preconditions.checkNotNull(stream);
65 output = new DataOutputStream(stream);
68 public NormalizedNodeOutputStreamWriter(DataOutput output) {
69 this.output = Preconditions.checkNotNull(output);
72 private NormalizedNodeWriter normalizedNodeWriter() {
73 if(normalizedNodeWriter == null) {
74 normalizedNodeWriter = NormalizedNodeWriter.forStreamWriter(this);
77 return normalizedNodeWriter;
80 public void writeNormalizedNode(NormalizedNode<?, ?> node) throws IOException {
81 writeSignatureMarkerAndVersionIfNeeded();
82 normalizedNodeWriter().write(node);
85 private void writeSignatureMarkerAndVersionIfNeeded() throws IOException {
86 if(!wroteSignatureMarker) {
87 output.writeByte(SIGNATURE_MARKER);
88 output.writeShort(CURRENT_VERSION);
89 wroteSignatureMarker = true;
94 public void leafNode(YangInstanceIdentifier.NodeIdentifier name, Object value) throws IOException, IllegalArgumentException {
95 Preconditions.checkNotNull(name, "Node identifier should not be null");
96 LOG.debug("Writing a new leaf node");
97 startNode(name.getNodeType(), NodeTypes.LEAF_NODE);
103 public void startLeafSet(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalArgumentException {
104 Preconditions.checkNotNull(name, "Node identifier should not be null");
105 LOG.debug("Starting a new leaf set");
107 startNode(name.getNodeType(), NodeTypes.LEAF_SET);
111 public void leafSetEntryNode(Object value) throws IOException, IllegalArgumentException {
112 LOG.debug("Writing a new leaf set entry node");
114 output.writeByte(NodeTypes.LEAF_SET_ENTRY_NODE);
119 public void startContainerNode(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalArgumentException {
120 Preconditions.checkNotNull(name, "Node identifier should not be null");
122 LOG.debug("Starting a new container node");
124 startNode(name.getNodeType(), NodeTypes.CONTAINER_NODE);
128 public void startUnkeyedList(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalArgumentException {
129 Preconditions.checkNotNull(name, "Node identifier should not be null");
130 LOG.debug("Starting a new unkeyed list");
132 startNode(name.getNodeType(), NodeTypes.UNKEYED_LIST);
136 public void startUnkeyedListItem(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalStateException {
137 Preconditions.checkNotNull(name, "Node identifier should not be null");
138 LOG.debug("Starting a new unkeyed list item");
140 startNode(name.getNodeType(), NodeTypes.UNKEYED_LIST_ITEM);
144 public void startMapNode(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalArgumentException {
145 Preconditions.checkNotNull(name, "Node identifier should not be null");
146 LOG.debug("Starting a new map node");
148 startNode(name.getNodeType(), NodeTypes.MAP_NODE);
152 public void startMapEntryNode(YangInstanceIdentifier.NodeIdentifierWithPredicates identifier, int childSizeHint) throws IOException, IllegalArgumentException {
153 Preconditions.checkNotNull(identifier, "Node identifier should not be null");
154 LOG.debug("Starting a new map entry node");
155 startNode(identifier.getNodeType(), NodeTypes.MAP_ENTRY_NODE);
157 writeKeyValueMap(identifier.getKeyValues());
162 public void startOrderedMapNode(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalArgumentException {
163 Preconditions.checkNotNull(name, "Node identifier should not be null");
164 LOG.debug("Starting a new ordered map node");
166 startNode(name.getNodeType(), NodeTypes.ORDERED_MAP_NODE);
170 public void startChoiceNode(YangInstanceIdentifier.NodeIdentifier name, int childSizeHint) throws IOException, IllegalArgumentException {
171 Preconditions.checkNotNull(name, "Node identifier should not be null");
172 LOG.debug("Starting a new choice node");
174 startNode(name.getNodeType(), NodeTypes.CHOICE_NODE);
178 public void startAugmentationNode(YangInstanceIdentifier.AugmentationIdentifier identifier) throws IOException, IllegalArgumentException {
179 Preconditions.checkNotNull(identifier, "Node identifier should not be null");
180 LOG.debug("Starting a new augmentation node");
182 output.writeByte(NodeTypes.AUGMENTATION_NODE);
183 writeQNameSet(identifier.getPossibleChildNames());
187 public void anyxmlNode(YangInstanceIdentifier.NodeIdentifier name, Object value) throws IOException, IllegalArgumentException {
188 Preconditions.checkNotNull(name, "Node identifier should not be null");
189 LOG.debug("Writing a new xml node");
191 startNode(name.getNodeType(), NodeTypes.ANY_XML_NODE);
197 public void endNode() throws IOException, IllegalStateException {
198 LOG.debug("Ending the node");
200 output.writeByte(NodeTypes.END_NODE);
204 public void close() throws IOException {
209 public void flush() throws IOException {
210 if (output instanceof OutputStream) {
211 ((OutputStream)output).flush();
215 private void startNode(final QName qName, byte nodeType) throws IOException {
217 Preconditions.checkNotNull(qName, "QName of node identifier should not be null.");
219 writeSignatureMarkerAndVersionIfNeeded();
221 // First write the type of node
222 output.writeByte(nodeType);
227 private void writeQName(QName qName) throws IOException {
229 writeCodedString(qName.getLocalName());
230 writeCodedString(qName.getNamespace().toString());
231 writeCodedString(qName.getFormattedRevision());
234 private void writeCodedString(String key) throws IOException {
235 Integer value = stringCodeMap.get(key);
237 output.writeByte(IS_CODE_VALUE);
238 output.writeInt(value);
241 output.writeByte(IS_STRING_VALUE);
242 stringCodeMap.put(key, Integer.valueOf(stringCodeMap.size()));
243 output.writeUTF(key);
245 output.writeByte(IS_NULL_VALUE);
250 private void writeObjSet(Set<?> set) throws IOException {
252 output.writeInt(set.size());
254 if(o instanceof String){
255 writeCodedString(o.toString());
257 throw new IllegalArgumentException("Expected value type to be String but was : " +
266 public void writeYangInstanceIdentifier(YangInstanceIdentifier identifier) throws IOException {
267 writeSignatureMarkerAndVersionIfNeeded();
268 writeYangInstanceIdentifierInternal(identifier);
271 private void writeYangInstanceIdentifierInternal(YangInstanceIdentifier identifier) throws IOException {
272 Collection<YangInstanceIdentifier.PathArgument> pathArguments = identifier.getPathArguments();
273 output.writeInt(pathArguments.size());
275 for(YangInstanceIdentifier.PathArgument pathArgument : pathArguments) {
276 writePathArgument(pathArgument);
280 public void writePathArgument(YangInstanceIdentifier.PathArgument pathArgument) throws IOException {
282 byte type = PathArgumentTypes.getSerializablePathArgumentType(pathArgument);
284 output.writeByte(type);
287 case PathArgumentTypes.NODE_IDENTIFIER :
289 YangInstanceIdentifier.NodeIdentifier nodeIdentifier =
290 (YangInstanceIdentifier.NodeIdentifier) pathArgument;
292 writeQName(nodeIdentifier.getNodeType());
295 case PathArgumentTypes.NODE_IDENTIFIER_WITH_PREDICATES:
297 YangInstanceIdentifier.NodeIdentifierWithPredicates nodeIdentifierWithPredicates =
298 (YangInstanceIdentifier.NodeIdentifierWithPredicates) pathArgument;
299 writeQName(nodeIdentifierWithPredicates.getNodeType());
301 writeKeyValueMap(nodeIdentifierWithPredicates.getKeyValues());
304 case PathArgumentTypes.NODE_IDENTIFIER_WITH_VALUE :
306 YangInstanceIdentifier.NodeWithValue nodeWithValue =
307 (YangInstanceIdentifier.NodeWithValue) pathArgument;
309 writeQName(nodeWithValue.getNodeType());
310 writeObject(nodeWithValue.getValue());
313 case PathArgumentTypes.AUGMENTATION_IDENTIFIER :
315 YangInstanceIdentifier.AugmentationIdentifier augmentationIdentifier =
316 (YangInstanceIdentifier.AugmentationIdentifier) pathArgument;
318 // No Qname in augmentation identifier
319 writeQNameSet(augmentationIdentifier.getPossibleChildNames());
322 throw new IllegalStateException("Unknown node identifier type is found : " + pathArgument.getClass().toString() );
326 private void writeKeyValueMap(Map<QName, Object> keyValueMap) throws IOException {
327 if(keyValueMap != null && !keyValueMap.isEmpty()) {
328 output.writeInt(keyValueMap.size());
329 Set<QName> qNameSet = keyValueMap.keySet();
331 for(QName qName : qNameSet) {
333 writeObject(keyValueMap.get(qName));
340 private void writeQNameSet(Set<QName> children) throws IOException {
341 // Write each child's qname separately, if list is empty send count as 0
342 if(children != null && !children.isEmpty()) {
343 output.writeInt(children.size());
344 for(QName qName : children) {
348 LOG.debug("augmentation node does not have any child");
353 private void writeObject(Object value) throws IOException {
355 byte type = ValueTypes.getSerializableType(value);
356 // Write object type first
357 output.writeByte(type);
360 case ValueTypes.BOOL_TYPE:
361 output.writeBoolean((Boolean) value);
363 case ValueTypes.QNAME_TYPE:
364 writeQName((QName) value);
366 case ValueTypes.INT_TYPE:
367 output.writeInt((Integer) value);
369 case ValueTypes.BYTE_TYPE:
370 output.writeByte((Byte) value);
372 case ValueTypes.LONG_TYPE:
373 output.writeLong((Long) value);
375 case ValueTypes.SHORT_TYPE:
376 output.writeShort((Short) value);
378 case ValueTypes.BITS_TYPE:
379 writeObjSet((Set<?>) value);
381 case ValueTypes.BINARY_TYPE:
382 byte[] bytes = (byte[]) value;
383 output.writeInt(bytes.length);
386 case ValueTypes.YANG_IDENTIFIER_TYPE:
387 writeYangInstanceIdentifierInternal((YangInstanceIdentifier) value);
389 case ValueTypes.NULL_TYPE :
391 case ValueTypes.STRING_BYTES_TYPE:
392 final byte[] valueBytes = value.toString().getBytes(StandardCharsets.UTF_8);
393 output.writeInt(valueBytes.length);
394 output.write(valueBytes);
397 output.writeUTF(value.toString());