org.apache.flink.cdc.common.utils.InstantiationUtil Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.cdc.common.utils;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.memory.DataInputViewStreamWrapper;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.OutputStream;
import java.io.Serializable;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.zip.DeflaterOutputStream;
/** Utility class to create instances from class objects. */
public class InstantiationUtil {
private InstantiationUtil() {
// no instantiation
}
/** A custom ObjectInputStream that can load classes using a specific ClassLoader. */
public static class ClassLoaderObjectInputStream extends ObjectInputStream {
protected final ClassLoader classLoader;
public ClassLoaderObjectInputStream(InputStream in, ClassLoader classLoader)
throws IOException {
super(in);
this.classLoader = classLoader;
}
@Override
protected Class resolveClass(ObjectStreamClass desc)
throws IOException, ClassNotFoundException {
if (classLoader != null) {
String name = desc.getName();
try {
return Class.forName(name, false, classLoader);
} catch (ClassNotFoundException ex) {
// check if class is a primitive class
Class cl = primitiveClasses.get(name);
if (cl != null) {
// return primitive class
return cl;
} else {
// throw ClassNotFoundException
throw ex;
}
}
}
return super.resolveClass(desc);
}
@Override
protected Class resolveProxyClass(String[] interfaces)
throws IOException, ClassNotFoundException {
if (classLoader != null) {
ClassLoader nonPublicLoader = null;
boolean hasNonPublicInterface = false;
// define proxy in class loader of non-public interface(s), if any
Class[] classObjs = new Class[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
Class cl = Class.forName(interfaces[i], false, classLoader);
if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
if (hasNonPublicInterface) {
if (nonPublicLoader != cl.getClassLoader()) {
throw new IllegalAccessError(
"conflicting non-public interface class loaders");
}
} else {
nonPublicLoader = cl.getClassLoader();
hasNonPublicInterface = true;
}
}
classObjs[i] = cl;
}
try {
return Proxy.getProxyClass(
hasNonPublicInterface ? nonPublicLoader : classLoader, classObjs);
} catch (IllegalArgumentException e) {
throw new ClassNotFoundException(null, e);
}
}
return super.resolveProxyClass(interfaces);
}
// ------------------------------------------------
private static final HashMap> primitiveClasses = new HashMap<>(9);
static {
primitiveClasses.put("boolean", boolean.class);
primitiveClasses.put("byte", byte.class);
primitiveClasses.put("char", char.class);
primitiveClasses.put("short", short.class);
primitiveClasses.put("int", int.class);
primitiveClasses.put("long", long.class);
primitiveClasses.put("float", float.class);
primitiveClasses.put("double", double.class);
primitiveClasses.put("void", void.class);
}
}
public static byte[] serializeObject(Object o) throws IOException {
try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos)) {
oos.writeObject(o);
oos.flush();
return baos.toByteArray();
}
}
public static void serializeObject(OutputStream out, Object o) throws IOException {
ObjectOutputStream oos =
out instanceof ObjectOutputStream
? (ObjectOutputStream) out
: new ObjectOutputStream(out);
oos.writeObject(o);
}
public static byte[] serializeObjectAndCompress(Object o) throws IOException {
try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
DeflaterOutputStream dos = new DeflaterOutputStream(baos);
ObjectOutputStream oos = new ObjectOutputStream(dos)) {
oos.writeObject(o);
oos.flush();
dos.close();
return baos.toByteArray();
}
}
public static boolean isSerializable(Object o) {
try {
serializeObject(o);
} catch (IOException e) {
return false;
}
return true;
}
public static byte[] serializeToByteArray(TypeSerializer serializer, T record)
throws IOException {
if (record == null) {
throw new NullPointerException("Record to serialize to byte array must not be null.");
}
ByteArrayOutputStream bos = new ByteArrayOutputStream(64);
DataOutputViewStreamWrapper outputViewWrapper = new DataOutputViewStreamWrapper(bos);
serializer.serialize(record, outputViewWrapper);
return bos.toByteArray();
}
public static T deserializeFromByteArray(TypeSerializer serializer, byte[] buf)
throws IOException {
if (buf == null) {
throw new NullPointerException("Byte array to deserialize from must not be null.");
}
DataInputViewStreamWrapper inputViewWrapper =
new DataInputViewStreamWrapper(new ByteArrayInputStream(buf));
return serializer.deserialize(inputViewWrapper);
}
public static T deserializeFromByteArray(TypeSerializer serializer, T reuse, byte[] buf)
throws IOException {
if (buf == null) {
throw new NullPointerException("Byte array to deserialize from must not be null.");
}
DataInputViewStreamWrapper inputViewWrapper =
new DataInputViewStreamWrapper(new ByteArrayInputStream(buf));
return serializer.deserialize(reuse, inputViewWrapper);
}
@SuppressWarnings("unchecked")
public static T deserializeObject(byte[] bytes, ClassLoader cl)
throws IOException, ClassNotFoundException {
return deserializeObject(new ByteArrayInputStream(bytes), cl);
}
@SuppressWarnings("unchecked")
public static T deserializeObject(InputStream in, ClassLoader cl)
throws IOException, ClassNotFoundException {
final ClassLoader old = Thread.currentThread().getContextClassLoader();
// not using resource try to avoid AutoClosable's close() on the given stream
try {
ObjectInputStream oois = new ClassLoaderObjectInputStream(in, cl);
Thread.currentThread().setContextClassLoader(cl);
return (T) oois.readObject();
} finally {
Thread.currentThread().setContextClassLoader(old);
}
}
/**
* Clones the given serializable object using Java serialization.
*
* @param obj Object to clone
* @param Type of the object to clone
* @return The cloned object
* @throws IOException Thrown if the serialization or deserialization process fails.
* @throws ClassNotFoundException Thrown if any of the classes referenced by the object cannot
* be resolved during deserialization.
*/
public static T clone(T obj)
throws IOException, ClassNotFoundException {
if (obj == null) {
return null;
} else {
return clone(obj, obj.getClass().getClassLoader());
}
}
/**
* Clones the given serializable object using Java serialization, using the given classloader to
* resolve the cloned classes.
*
* @param obj Object to clone
* @param classLoader The classloader to resolve the classes during deserialization.
* @param Type of the object to clone
* @return Cloned object
* @throws IOException Thrown if the serialization or deserialization process fails.
* @throws ClassNotFoundException Thrown if any of the classes referenced by the object cannot
* be resolved during deserialization.
*/
public static T clone(T obj, ClassLoader classLoader)
throws IOException, ClassNotFoundException {
if (obj == null) {
return null;
} else {
final byte[] serializedObject = serializeObject(obj);
return deserializeObject(serializedObject, classLoader);
}
}
}
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