org.apache.jackrabbit.core.data.db.ResettableTempFileInputStream 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.jackrabbit.core.data.db;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.channels.FileChannel;
/**
* TempFileInputStream that can be reset in order to allow the
* ConnectionHelper to retry SQL execution in case of failure.
*/
public class ResettableTempFileInputStream extends TempFileInputStream {
private final FileChannel fileChannel;
private long mark = 0;
public ResettableTempFileInputStream(final File file) throws FileNotFoundException {
this(new FileInputStream(file), file);
}
private ResettableTempFileInputStream(final FileInputStream in, final File file) {
super(in, file);
this.fileChannel = in.getChannel();
}
@Override
public boolean markSupported() {
return true;
}
@Override
public synchronized void mark(int readlimit) {
try {
mark = fileChannel.position();
} catch (IOException ex) {
mark = -1;
}
}
@Override
public synchronized void reset() throws IOException {
if (mark == -1) {
throw new IOException("Mark failed");
}
fileChannel.position(mark);
}
}