public void execute(SPFSession session, FutureSPFResult result, boolean throttle) {
SPFChecker checker;
while ((checker = session.popChecker()) != null) {
// only execute checkers we added (better recursivity)
log.debug("Executing checker: " + checker);
try {
DNSLookupContinuation cont = checker.checkSPF(session);
// if the checker returns a continuation we return it
if (cont != null) {
invokeAsynchService(session, result, cont, throttle);
return;
}
} catch (Exception e) {
while (e != null) {
while (checker == null || !(checker instanceof SPFCheckerExceptionCatcher)) {
checker = session.popChecker();
}
try {
((SPFCheckerExceptionCatcher) checker).onException(e, session);
e = null;
} catch (SPFResultException ex) {
e = ex;
} finally {
checker = null;
}
}
}
}
result.setSPFResult(session);
}
public SPFChecker init(SPFSession spfSession) {
// TODO understand what exactly we have to do now that spfData is a session
// and contains much more than the input data.
// do we need to create a new session at all?
// do we need to backup the session attributes and restore them?
this.previousResult = spfSession.getCurrentResult();
this.previousDomain = spfSession.getCurrentDomain();
this.previousResultExpanded = spfSession.getCurrentResultExpanded();
return this;
}
/** @see org.apache.james.jspf.core.SPFChecker#checkSPF(org.apache.james.jspf.core.SPFSession) */
public DNSLookupContinuation checkSPF(SPFSession spfData)
throws PermErrorException, TempErrorException, NoneException, NeutralException {
// update currentDepth
spfData.increaseCurrentDepth();
SPFChecker cleanupAndResultHandler = new CleanupAndResultChecker().init(spfData);
spfData.pushChecker(cleanupAndResultHandler);
spfData.pushChecker(new ExpandedChecker());
return macroExpand.checkExpand(getHost(), spfData, MacroExpand.DOMAIN);
}
public void run() {
while (true) {
IResponse resp = responseQueue.removeResponse();
Integer respId = (Integer) resp.getId();
SPFSession session = sessions.remove(respId);
FutureSPFResult result = results.remove(respId);
DNSLookupContinuation cont =
(DNSLookupContinuation) session.getAttribute(ATTRIBUTE_STAGED_EXECUTOR_CONTINUATION);
DNSResponse response;
if (resp.getException() != null) {
response = new DNSResponse((TimeoutException) resp.getException());
} else {
response = new DNSResponse(resp.getValue());
}
try {
cont = cont.getListener().onDNSResponse(response, session);
if (cont != null) {
invokeAsynchService(session, result, cont, false);
} else {
execute(session, result, false);
}
} catch (Exception e) {
SPFChecker checker = null;
while (e != null) {
while (checker == null || !(checker instanceof SPFCheckerExceptionCatcher)) {
checker = session.popChecker();
}
try {
((SPFCheckerExceptionCatcher) checker).onException(e, session);
e = null;
} catch (SPFResultException ex) {
e = ex;
} finally {
checker = null;
}
}
execute(session, result, false);
}
}
}
/**
* @see org.apache.james.jspf.core.SPFChecker#checkSPF(org.apache.james.jspf.core.SPFSession)
*/
public DNSLookupContinuation checkSPF(SPFSession spfData)
throws PermErrorException, TempErrorException {
// throws a PermErrorException that we can pass through
String host = macroExpand.expand(getHost(), spfData, MacroExpand.DOMAIN);
spfData.setCurrentDomain(host);
// On includes we should not use the explanation of the included domain
spfData.setIgnoreExplanation(true);
// set a null current result
spfData.setCurrentResult(null);
spfData.setCurrentResultExpanded(null);
spfData.pushChecker(spfChecker);
return null;
}
/**
* @see org.apache.james.jspf.core.SPFChecker#checkSPF(org.apache.james.jspf.core.SPFSession)
*/
public DNSLookupContinuation checkSPF(SPFSession spfData)
throws PermErrorException, TempErrorException, NeutralException, NoneException {
String currentResult = spfData.getCurrentResult();
restoreSession(spfData);
if (currentResult == null) {
throw new TempErrorException("included checkSPF returned null");
} else if (currentResult.equals(SPF1Constants.PASS)) {
// TODO this won't work asynchronously
spfData.setAttribute(Directive.ATTRIBUTE_MECHANISM_RESULT, Boolean.TRUE);
} else if (currentResult.equals(SPF1Constants.FAIL)
|| currentResult.equals(SPF1Constants.SOFTFAIL)
|| currentResult.equals(SPF1Constants.NEUTRAL)) {
// TODO this won't work asynchronously
spfData.setAttribute(Directive.ATTRIBUTE_MECHANISM_RESULT, Boolean.FALSE);
} else {
throw new TempErrorException("included checkSPF returned an Illegal result");
}
return null;
}
/**
* throttle should be true only when the caller thread is the client and not the worker thread. We
* could even remove the throttle parameter and check the currentThread. This way the worker is
* never "blocked" while outside callers will be blocked if our queue is too big (so this is not
* fully "asynchronous").
*/
private synchronized void invokeAsynchService(
SPFSession session, FutureSPFResult result, DNSLookupContinuation cont, boolean throttle) {
while (throttle && results.size() > 50) {
try {
this.wait(100);
} catch (InterruptedException e) {
}
}
int nextId = nextId();
sessions.put(new Integer(nextId), session);
results.put(new Integer(nextId), result);
session.setAttribute(ATTRIBUTE_STAGED_EXECUTOR_CONTINUATION, cont);
dnsProbe.getRecordsAsynch(cont.getRequest(), nextId, responseQueue);
}
private void restoreSession(SPFSession spfData) {
spfData.setIgnoreExplanation(false);
spfData.setCurrentDomain(previousDomain);
spfData.setCurrentResult(previousResult);
spfData.setCurrentResultExpanded(previousResultExpanded);
}