org.apache.mina.filter.codec.serialization.ObjectSerializationDecoder Maven / Gradle / Ivy
/*
* 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.mina.filter.codec.serialization;
import java.io.Serializable;
import org.apache.mina.core.buffer.BufferDataException;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
/**
* A {@link ProtocolDecoder} which deserializes {@link Serializable} Java
* objects using {@link IoBuffer#getObject(ClassLoader)}.
*
* @author Apache MINA Project
*/
public class ObjectSerializationDecoder extends CumulativeProtocolDecoder {
private final ClassLoader classLoader;
private int maxObjectSize = 1048576; // 1MB
/**
* Creates a new instance with the {@link ClassLoader} of
* the current thread.
*/
public ObjectSerializationDecoder() {
this(Thread.currentThread().getContextClassLoader());
}
/**
* Creates a new instance with the specified {@link ClassLoader}.
*
* @param classLoader The class loader to use
*/
public ObjectSerializationDecoder(ClassLoader classLoader) {
if (classLoader == null) {
throw new IllegalArgumentException("classLoader");
}
this.classLoader = classLoader;
}
/**
* @return the allowed maximum size of the object to be decoded.
* If the size of the object to be decoded exceeds this value, this
* decoder will throw a {@link BufferDataException}. The default
* value is 1048576 (1MB).
*/
public int getMaxObjectSize() {
return maxObjectSize;
}
/**
* Sets the allowed maximum size of the object to be decoded.
* If the size of the object to be decoded exceeds this value, this
* decoder will throw a {@link BufferDataException}. The default
* value is 1048576 (1MB).
*
* @param maxObjectSize The maximum size for an object to be decoded
*/
public void setMaxObjectSize(int maxObjectSize) {
if (maxObjectSize <= 0) {
throw new IllegalArgumentException("maxObjectSize: " + maxObjectSize);
}
this.maxObjectSize = maxObjectSize;
}
/**
* {@inheritDoc}
*/
@Override
protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
if (!in.prefixedDataAvailable(4, maxObjectSize)) {
return false;
}
out.write(in.getObject(classLoader));
return true;
}
}