org.eclipse.dawnsci.nexus.builder.impl.DefaultNexusScanFile Maven / Gradle / Ivy
/*-
*******************************************************************************
* Copyright (c) 2011, 2016 Diamond Light Source Ltd.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Gerring - initial API and implementation and/or initial documentation
*******************************************************************************/
package org.eclipse.dawnsci.nexus.builder.impl;
import org.eclipse.dawnsci.nexus.INexusFileFactory;
import org.eclipse.dawnsci.nexus.NexusException;
import org.eclipse.dawnsci.nexus.NexusFile;
import org.eclipse.dawnsci.nexus.ServiceHolder;
import org.eclipse.dawnsci.nexus.builder.NexusScanFile;
class DefaultNexusScanFile implements NexusScanFile {
private final String filePath;
private NexusFile nexusFile = null;
protected DefaultNexusScanFile(final String filePath) {
this.filePath = filePath;
}
@Override
public void openToWrite() throws NexusException {
if (nexusFile != null) {
throw new IllegalStateException("NexusFile is already open.");
}
final INexusFileFactory nexusFileFactory = ServiceHolder.getNexusFileFactory();
nexusFile = nexusFileFactory.newNexusFile(filePath, true);
nexusFile.openToWrite(false); // file must already exist on disk
try {
nexusFile.activateSwmrMode();
} catch (NexusException nxsE) {
System.out.println("Scan to '"+nexusFile.getFilePath()+"' is not SWMR "+nxsE.getMessage());
// We are not in SWMR mode so we allow a non-SWMR write, which works but other processes may have issues.
}
}
@Override
public int flush() throws NexusException {
if (nexusFile == null) return -1; // Legal flush can be called on non-SWMR files and does nothing.
return nexusFile.flush();
}
@Override
public void close() throws NexusException {
if (nexusFile == null) return; // Legal this is an AutoClosable that does if it can.
try {
nexusFile.flush();
} catch (NexusException ignored) {
// Do nothing.
}
nexusFile.close();
nexusFile = null;
}
}