/**
* Cleanup a file after it has been successfully processed.
*
* <p>This can through both IOExceptions and runtime exceptions due to Preconditions failures.
*
* <p>According to the link below, Solaris (I assume POSIX/linux) does atomic rename but Windows
* does not guarantee it. http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4017593 To be truly
* correct, I need to check the return value (will likely fail in unix if moving from one volume
* to another instead of just within same volume)
*/
synchronized void changeState(String tag, State oldState, State newState) throws IOException {
DFOData data = table.get(tag);
Preconditions.checkArgument(data != null, "Tag " + tag + " has no data");
Preconditions.checkArgument(
tag.equals(data.tag), "Data associated with tag didn't match tag " + tag);
if (LOG.isDebugEnabled()) {
LOG.debug("Change " + data.s + "/" + oldState + " to " + newState + " : " + tag);
}
// null allows any previous state.
if (oldState == null) {
oldState = data.s;
}
Preconditions.checkState(
data.s == oldState, "Expected state to be " + oldState + " but was " + data.s);
if (oldState == State.ERROR) {
throw new IllegalStateException("Cannot move from error state");
}
// SENT is terminal state, no where to move, just delete it.
if (newState == State.SENT) {
getQueue(oldState).remove(tag);
File sentFile = getFile(tag);
data.s = newState;
if (!sentFile.delete()) {
LOG.error("Couldn't delete " + sentFile + " - can be safely manually deleted");
}
// TODO (jon) need to eventually age off sent files entry to not exhaust
// memory
return;
}
// move files to other directories to making state change durable.
File orig = getFile(tag);
File newf = new File(getDir(newState), tag);
boolean success = orig.renameTo(newf);
if (!success) {
throw new IOException("Move " + orig + " -> " + newf + "failed!");
}
// is successful, update queues.
LOG.debug("old state is " + oldState);
getQueue(oldState).remove(tag);
BlockingQueue<String> q = getQueue(newState);
if (q != null) {
q.add(tag);
}
data.s = newState;
}
static DFOData recovered(String tag) {
DFOData data = new DFOData(tag);
data.s = State.LOGGED;
return data;
}
