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Java Socket-Less Inter-Process Communication API
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package org.jslipc.channel.file;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import org.jslipc.JslipcBinman;
import org.jslipc.channel.JslipcChannel;
import org.jslipc.util.FileUtil;
/**
* Common base class for file based {@link JslipcChannel}s.
*/
public abstract class AbstractJslipcFileChannel implements JslipcChannel, JslipcBinman {
protected FileChannel fileChannel;
private RandomAccessFile randomAccessFile;
private File closeMarker;
private boolean closed;
private boolean deleteFilesOnClose;
private File file;
public AbstractJslipcFileChannel(File file, String mode) throws IOException {
this.file = file;
this.randomAccessFile = new RandomAccessFile(file, mode);
this.closeMarker = new File(file.getAbsolutePath() + ".closed");
fileChannel = this.randomAccessFile.getChannel();
}
@Override
public void cleanUpOnClose() {
deleteFilesOnClose = true;
}
protected FileChannel getFileChannel() {
return fileChannel;
}
@Override
public JslipcChannelState getState() {
if (!isOpen()) {
return JslipcChannelState.Closed;
}
if (hasCloseMarker()) {
return JslipcChannelState.ClosedByPeer;
}
return JslipcChannelState.Open;
}
protected void checkClosed() throws ClosedChannelException {
if (!isOpen()) {
throw new ClosedChannelException();
}
}
@Override
public void close() throws IOException {
if (!isOpen()) {
return;
}
this.closed = true;
fileChannel.close();
randomAccessFile.close();
boolean closedByPeer = !getCloseMarker().createNewFile();
if (closedByPeer) {
if (deleteFilesOnClose) {
FileUtil.delete(file);
FileUtil.delete(getCloseMarker());
}
}
}
private File getCloseMarker() {
return closeMarker;
}
private boolean hasCloseMarker() {
return getCloseMarker().exists();
}
@Override
public boolean isOpen() {
return !closed;
}
}