/**
* 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.activemq.artemis.core.io.util;
import java.nio.ByteBuffer;
import org.apache.activemq.artemis.core.io.SequentialFile;
import org.jboss.logging.Logger;
public class FileIOUtil {
private static final Logger logger = Logger.getLogger(FileIOUtil.class);
public static void copyData(SequentialFile from, SequentialFile to, ByteBuffer buffer) throws Exception {
boolean fromIsOpen = from.isOpen();
boolean toIsOpen = to.isOpen();
from.close();
from.open();
if (!toIsOpen) {
to.open();
}
to.position(to.size());
from.position(0);
try {
for (;;) {
// The buffer is reused...
// We need to make sure we clear the limits and the buffer before reusing it
buffer.clear();
int bytesRead = from.read(buffer);
if (logger.isTraceEnabled()) {
logger.trace("appending " + bytesRead + " bytes on " + to.getFileName());
}
if (bytesRead > 0) {
to.writeDirect(buffer, false);
}
if (bytesRead < buffer.capacity()) {
logger.trace("Interrupting reading as the whole thing was sent on " + to.getFileName());
break;
}
}
} finally {
if (!fromIsOpen) {
from.close();
} else {
from.position(from.size());
}
if (!toIsOpen) {
to.close();
} else {
to.position(to.size());
}
}
}
}