/**
* Create a PerfDataBuffer instance for accessing the specified instrumentation buffer.
*
* @param vmid the <em>file:</em> URI to the instrumentation buffer file
* @throws MonitorException
*/
public PerfDataBuffer(VmIdentifier vmid) throws MonitorException {
File f = new File(vmid.getURI());
String mode = vmid.getMode();
try {
FileChannel fc = new RandomAccessFile(f, mode).getChannel();
ByteBuffer bb = null;
if (mode.compareTo("r") == 0) {
bb = fc.map(FileChannel.MapMode.READ_ONLY, 0L, (int) fc.size());
} else if (mode.compareTo("rw") == 0) {
bb = fc.map(FileChannel.MapMode.READ_WRITE, 0L, (int) fc.size());
} else {
throw new IllegalArgumentException("Invalid mode: " + mode);
}
fc.close(); // doesn't need to remain open
createPerfDataBuffer(bb, 0);
} catch (FileNotFoundException e) {
throw new MonitorException("Could not find " + vmid.toString());
} catch (IOException e) {
throw new MonitorException("Could not read " + vmid.toString());
}
}
/** {@inheritDoc} */
public MonitoredVm getMonitoredVm(VmIdentifier vmid, int interval) throws MonitorException {
VmIdentifier nvmid = null;
try {
nvmid = hostId.resolve(vmid);
RemoteVm rvm = remoteHost.attachVm(vmid.getLocalVmId(), vmid.getMode());
RemoteMonitoredVm rmvm = new RemoteMonitoredVm(rvm, nvmid, timer, interval);
rmvm.attach();
return rmvm;
} catch (RemoteException e) {
throw new MonitorException("Remote Exception attaching to " + nvmid.toString(), e);
} catch (URISyntaxException e) {
/*
* the VmIdentifier is expected to be a valid and should resolve
* easonably against the host identifier. A URISyntaxException
* here is most likely a programming error.
*/
throw new IllegalArgumentException("Malformed URI: " + vmid.toString(), e);
}
}