2 * Copyright 2014-present Open Networking Foundation
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 package io.atomix.utils.serializer;
18 import com.esotericsoftware.kryo.Kryo;
19 import com.esotericsoftware.kryo.Registration;
20 import com.esotericsoftware.kryo.Serializer;
21 import com.esotericsoftware.kryo.io.ByteBufferInput;
22 import com.esotericsoftware.kryo.io.ByteBufferOutput;
23 import com.esotericsoftware.kryo.pool.KryoCallback;
24 import com.esotericsoftware.kryo.pool.KryoFactory;
25 import com.esotericsoftware.kryo.pool.KryoPool;
26 import com.google.common.base.MoreObjects;
27 import com.google.common.collect.ImmutableList;
28 import org.objenesis.strategy.StdInstantiatorStrategy;
29 import org.slf4j.Logger;
30 import org.slf4j.LoggerFactory;
32 import java.io.ByteArrayInputStream;
33 import java.io.InputStream;
34 import java.io.OutputStream;
35 import java.nio.ByteBuffer;
36 import java.util.ArrayList;
37 import java.util.Arrays;
38 import java.util.List;
40 import java.util.Map.Entry;
41 import java.util.Objects;
43 import static java.util.Objects.requireNonNull;
46 * Pool of Kryo instances, with classes pre-registered.
49 public final class Namespace implements KryoFactory, KryoPool {
52 * Default buffer size used for serialization.
54 * @see #serialize(Object)
56 public static final int DEFAULT_BUFFER_SIZE = 4096;
59 * ID to use if this KryoNamespace does not define registration id.
61 private static final int FLOATING_ID = -1;
64 * Smallest ID free to use for user defined registrations.
66 private static final int INITIAL_ID = 16;
68 static final String NO_NAME = "(no name)";
70 private static final Logger LOGGER = LoggerFactory.getLogger(Namespace.class);
72 private final KryoPool kryoPool = new KryoPool.Builder(this).softReferences().build();
74 private final KryoOutputPool kryoOutputPool = new KryoOutputPool();
75 private final KryoInputPool kryoInputPool = new KryoInputPool();
77 private final ImmutableList<RegistrationBlock> registeredBlocks;
79 private final ClassLoader classLoader;
80 private final boolean registrationRequired;
81 private final String friendlyName;
84 * KryoNamespace builder.
87 public static final class Builder {
88 private int blockHeadId = INITIAL_ID;
89 private List<Entry<Class<?>[], Serializer<?>>> types = new ArrayList<>();
90 private List<RegistrationBlock> blocks = new ArrayList<>();
91 private ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
92 private boolean registrationRequired = true;
95 * Builds a {@link Namespace} instance.
97 * @return KryoNamespace
99 public Namespace build() {
100 return build(NO_NAME);
104 * Builds a {@link Namespace} instance.
106 * @param friendlyName friendly name for the namespace
107 * @return KryoNamespace
109 public Namespace build(String friendlyName) {
110 if (!types.isEmpty()) {
111 blocks.add(new RegistrationBlock(this.blockHeadId, types));
113 return new Namespace(blocks, classLoader, registrationRequired, friendlyName).populate(1);
117 * Registers serializer for the given set of classes.
119 * When multiple classes are registered with an explicitly provided serializer, the namespace guarantees
120 * all instances will be serialized with the same type ID.
122 * @param classes list of classes to register
123 * @param serializer serializer to use for the class
126 public Builder register(Serializer<?> serializer, final Class<?>... classes) {
127 types.add(Map.entry(classes, serializer));
132 * Sets the namespace class loader.
134 * @param classLoader the namespace class loader
135 * @return the namespace builder
137 public Builder setClassLoader(ClassLoader classLoader) {
138 this.classLoader = classLoader;
143 * Sets the registrationRequired flag.
145 * @param registrationRequired Kryo's registrationRequired flag
147 * @see Kryo#setRegistrationRequired(boolean)
149 public Builder setRegistrationRequired(boolean registrationRequired) {
150 this.registrationRequired = registrationRequired;
156 * Creates a new {@link Namespace} builder.
160 public static Builder builder() {
161 return new Builder();
165 * Creates a Kryo instance pool.
167 * @param registeredTypes types to register
168 * @param registrationRequired whether registration is required
169 * @param friendlyName friendly name for the namespace
172 final List<RegistrationBlock> registeredTypes,
173 ClassLoader classLoader,
174 boolean registrationRequired,
175 String friendlyName) {
176 this.registeredBlocks = ImmutableList.copyOf(registeredTypes);
177 this.registrationRequired = registrationRequired;
178 this.classLoader = classLoader;
179 this.friendlyName = requireNonNull(friendlyName);
183 * Populates the Kryo pool.
185 * @param instances to add to the pool
188 public Namespace populate(int instances) {
190 for (int i = 0; i < instances; ++i) {
197 * Serializes given object to byte array using Kryo instance in pool.
199 * Note: Serialized bytes must be smaller than {@link #MAX_BUFFER_SIZE}.
201 * @param obj Object to serialize
202 * @return serialized bytes
204 public byte[] serialize(final Object obj) {
205 return serialize(obj, DEFAULT_BUFFER_SIZE);
209 * Serializes given object to byte array using Kryo instance in pool.
211 * @param obj Object to serialize
212 * @param bufferSize maximum size of serialized bytes
213 * @return serialized bytes
215 public byte[] serialize(final Object obj, final int bufferSize) {
216 return kryoOutputPool.run(output -> {
217 return kryoPool.run(kryo -> {
218 kryo.writeClassAndObject(output, obj);
220 return output.getByteArrayOutputStream().toByteArray();
226 * Serializes given object to byte buffer using Kryo instance in pool.
228 * @param obj Object to serialize
229 * @param buffer to write to
231 public void serialize(final Object obj, final ByteBuffer buffer) {
232 ByteBufferOutput out = new ByteBufferOutput(buffer);
233 Kryo kryo = borrow();
235 kryo.writeClassAndObject(out, obj);
243 * Serializes given object to OutputStream using Kryo instance in pool.
245 * @param obj Object to serialize
246 * @param stream to write to
248 public void serialize(final Object obj, final OutputStream stream) {
249 serialize(obj, stream, DEFAULT_BUFFER_SIZE);
253 * Serializes given object to OutputStream using Kryo instance in pool.
255 * @param obj Object to serialize
256 * @param stream to write to
257 * @param bufferSize size of the buffer in front of the stream
259 public void serialize(final Object obj, final OutputStream stream, final int bufferSize) {
260 ByteBufferOutput out = new ByteBufferOutput(stream, bufferSize);
261 Kryo kryo = borrow();
263 kryo.writeClassAndObject(out, obj);
271 * Deserializes given byte array to Object using Kryo instance in pool.
273 * @param bytes serialized bytes
274 * @param <T> deserialized Object type
275 * @return deserialized Object
277 public <T> T deserialize(final byte[] bytes) {
278 return kryoInputPool.run(input -> {
279 input.setInputStream(new ByteArrayInputStream(bytes));
280 return kryoPool.run(kryo -> {
281 @SuppressWarnings("unchecked")
282 T obj = (T) kryo.readClassAndObject(input);
285 }, DEFAULT_BUFFER_SIZE);
289 * Deserializes given byte buffer to Object using Kryo instance in pool.
291 * @param buffer input with serialized bytes
292 * @param <T> deserialized Object type
293 * @return deserialized Object
295 public <T> T deserialize(final ByteBuffer buffer) {
296 ByteBufferInput in = new ByteBufferInput(buffer);
297 Kryo kryo = borrow();
299 @SuppressWarnings("unchecked")
300 T obj = (T) kryo.readClassAndObject(in);
308 * Deserializes given InputStream to an Object using Kryo instance in pool.
310 * @param stream input stream
311 * @param <T> deserialized Object type
312 * @return deserialized Object
314 public <T> T deserialize(final InputStream stream) {
315 return deserialize(stream, DEFAULT_BUFFER_SIZE);
319 * Deserializes given InputStream to an Object using Kryo instance in pool.
321 * @param stream input stream
322 * @param <T> deserialized Object type
323 * @param bufferSize size of the buffer in front of the stream
324 * @return deserialized Object
326 public <T> T deserialize(final InputStream stream, final int bufferSize) {
327 ByteBufferInput in = new ByteBufferInput(stream, bufferSize);
328 Kryo kryo = borrow();
330 @SuppressWarnings("unchecked")
331 T obj = (T) kryo.readClassAndObject(in);
338 private String friendlyName() {
343 * Gets the number of classes registered in this Kryo namespace.
345 * @return size of namespace
348 return (int) registeredBlocks.stream()
349 .flatMap(block -> block.types().stream())
354 * Creates a Kryo instance.
356 * @return Kryo instance
359 public Kryo create() {
360 LOGGER.trace("Creating Kryo instance for {}", this);
361 Kryo kryo = new Kryo();
362 kryo.setClassLoader(classLoader);
363 kryo.setRegistrationRequired(registrationRequired);
365 // TODO rethink whether we want to use StdInstantiatorStrategy
366 kryo.setInstantiatorStrategy(
367 new Kryo.DefaultInstantiatorStrategy(new StdInstantiatorStrategy()));
369 for (RegistrationBlock block : registeredBlocks) {
370 int id = block.begin();
371 if (id == FLOATING_ID) {
372 id = kryo.getNextRegistrationId();
374 for (Entry<Class<?>[], Serializer<?>> entry : block.types()) {
375 register(kryo, entry.getKey(), entry.getValue(), id++);
382 * Register {@code type} and {@code serializer} to {@code kryo} instance.
384 * @param kryo Kryo instance
385 * @param types types to register
386 * @param serializer Specific serializer to register or null to use default.
387 * @param id type registration id to use
389 private void register(Kryo kryo, Class<?>[] types, Serializer<?> serializer, int id) {
390 Registration existing = kryo.getRegistration(id);
391 if (existing != null) {
392 boolean matches = false;
393 for (Class<?> type : types) {
394 if (existing.getType() == type) {
401 LOGGER.error("{}: Failed to register {} as {}, {} was already registered.",
402 friendlyName(), types, id, existing.getType());
404 throw new IllegalStateException(String.format(
405 "Failed to register %s as %s, %s was already registered.",
406 Arrays.toString(types), id, existing.getType()));
408 // falling through to register call for now.
409 // Consider skipping, if there's reasonable
410 // way to compare serializer equivalence.
413 for (Class<?> type : types) {
414 Registration r = null;
415 if (serializer == null) {
416 r = kryo.register(type, id);
417 } else if (type.isInterface()) {
418 kryo.addDefaultSerializer(type, serializer);
420 r = kryo.register(type, serializer, id);
423 if (r.getId() != id) {
424 LOGGER.debug("{}: {} already registered as {}. Skipping {}.",
425 friendlyName(), r.getType(), r.getId(), id);
427 LOGGER.trace("{} registered as {}", r.getType(), r.getId());
433 public Kryo borrow() {
434 return kryoPool.borrow();
438 public void release(Kryo kryo) {
439 kryoPool.release(kryo);
443 public <T> T run(KryoCallback<T> callback) {
444 return kryoPool.run(callback);
448 public String toString() {
449 if (!NO_NAME.equals(friendlyName)) {
450 return MoreObjects.toStringHelper(getClass())
452 .add("friendlyName", friendlyName)
453 // omit lengthy detail, when there's a name
456 return MoreObjects.toStringHelper(getClass())
457 .add("registeredBlocks", registeredBlocks)
461 static final class RegistrationBlock {
462 private final int begin;
463 private final ImmutableList<Entry<Class<?>[], Serializer<?>>> types;
465 RegistrationBlock(int begin, List<Entry<Class<?>[], Serializer<?>>> types) {
467 this.types = ImmutableList.copyOf(types);
474 public ImmutableList<Entry<Class<?>[], Serializer<?>>> types() {
479 public String toString() {
480 return MoreObjects.toStringHelper(getClass())
487 public int hashCode() {
488 return types.hashCode();
491 // Only the registered types are used for equality.
493 public boolean equals(Object obj) {
498 if (obj instanceof RegistrationBlock) {
499 RegistrationBlock that = (RegistrationBlock) obj;
500 return Objects.equals(this.types, that.types);