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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.tomcat.util.buf;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.compat.JreCompat;
import org.apache.tomcat.util.res.StringManager;
public class ByteBufferUtils {
private static final StringManager sm = StringManager.getManager(ByteBufferUtils.class);
private static final Log log = LogFactory.getLog(ByteBufferUtils.class);
private static final Object unsafe;
private static final Method cleanerMethod;
private static final Method cleanMethod;
private static final Method invokeCleanerMethod;
static {
ByteBuffer tempBuffer = ByteBuffer.allocateDirect(0);
Method cleanerMethodLocal = null;
Method cleanMethodLocal = null;
Object unsafeLocal = null;
Method invokeCleanerMethodLocal = null;
if (JreCompat.isJre9Available()) {
try {
Class<?> clazz = Class.forName("sun.misc.Unsafe");
Field theUnsafe = clazz.getDeclaredField("theUnsafe");
theUnsafe.setAccessible(true);
unsafeLocal = theUnsafe.get(null);
invokeCleanerMethodLocal = clazz.getMethod("invokeCleaner", ByteBuffer.class);
invokeCleanerMethodLocal.invoke(unsafeLocal, tempBuffer);
} catch (IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException
| ClassNotFoundException | NoSuchFieldException e) {
log.warn(sm.getString("byteBufferUtils.cleaner"), e);
unsafeLocal = null;
invokeCleanerMethodLocal = null;
}
} else {
try {
cleanerMethodLocal = tempBuffer.getClass().getMethod("cleaner");
cleanerMethodLocal.setAccessible(true);
Object cleanerObject = cleanerMethodLocal.invoke(tempBuffer);
cleanMethodLocal = cleanerObject.getClass().getMethod("clean");
cleanMethodLocal.invoke(cleanerObject);
} catch (NoSuchMethodException | SecurityException | IllegalAccessException |
IllegalArgumentException | InvocationTargetException e) {
log.warn(sm.getString("byteBufferUtils.cleaner"), e);
cleanerMethodLocal = null;
cleanMethodLocal = null;
}
}
cleanerMethod = cleanerMethodLocal;
cleanMethod = cleanMethodLocal;
unsafe = unsafeLocal;
invokeCleanerMethod = invokeCleanerMethodLocal;
}
private ByteBufferUtils() {
// Hide the default constructor since this is a utility class.
}
/**
* Expands buffer to the given size unless it is already as big or bigger.
* Buffers are assumed to be in 'write to' mode since there would be no need
* to expand a buffer while it was in 'read from' mode.
*
* @param in Buffer to expand
* @param newSize The size t which the buffer should be expanded
* @return The expanded buffer with any data from the input buffer
* copied in to it or the original buffer if there was no
* need for expansion
*/
public static ByteBuffer expand(ByteBuffer in, int newSize) {
if (in.capacity() >= newSize) {
return in;
}
ByteBuffer out;
boolean direct = false;
if (in.isDirect()) {
out = ByteBuffer.allocateDirect(newSize);
direct = true;
} else {
out = ByteBuffer.allocate(newSize);
}
// Copy data
in.flip();
out.put(in);
if (direct) {
cleanDirectBuffer(in);
}
return out;
}
public static void cleanDirectBuffer(ByteBuffer buf) {
if (cleanMethod != null) {
try {
cleanMethod.invoke(cleanerMethod.invoke(buf));
} catch (IllegalAccessException | IllegalArgumentException
| InvocationTargetException | SecurityException e) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("byteBufferUtils.cleaner"), e);
}
}
} else if (invokeCleanerMethod != null) {
try {
invokeCleanerMethod.invoke(unsafe, buf);
} catch (IllegalAccessException | IllegalArgumentException
| InvocationTargetException | SecurityException e) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("byteBufferUtils.cleaner"), e);
}
}
}
}
}
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