@Override
public Set<String> apply(Stream stream, Fields requestHeaders, Fields responseHeaders) {
Set<String> result = Collections.<String>emptySet();
short version = stream.getSession().getVersion();
if (!isIfModifiedSinceHeaderPresent(requestHeaders)
&& isValidMethod(requestHeaders.get(HTTPSPDYHeader.METHOD.name(version)).getValue())
&& !isUserAgentBlacklisted(requestHeaders)) {
String scheme = requestHeaders.get(HTTPSPDYHeader.SCHEME.name(version)).getValue();
String host = requestHeaders.get(HTTPSPDYHeader.HOST.name(version)).getValue();
String origin = scheme + "://" + host;
String url = requestHeaders.get(HTTPSPDYHeader.URI.name(version)).getValue();
String absoluteURL = origin + url;
if (LOG.isDebugEnabled()) LOG.debug("Applying push strategy for {}", absoluteURL);
if (isMainResource(url, responseHeaders)) {
MainResource mainResource = getOrCreateMainResource(absoluteURL);
result = mainResource.getResources();
} else if (isPushResource(url, responseHeaders)) {
Fields.Field referrerHeader = requestHeaders.get("referer");
if (referrerHeader != null) {
String referrer = referrerHeader.getValue();
MainResource mainResource = mainResources.get(referrer);
if (mainResource == null) mainResource = getOrCreateMainResource(referrer);
Set<String> pushResources = mainResource.getResources();
if (!pushResources.contains(url)) mainResource.addResource(url, origin, referrer);
else result = getPushResources(absoluteURL);
}
}
if (LOG.isDebugEnabled())
LOG.debug("Pushing {} resources for {}: {}", result.size(), absoluteURL, result);
}
return result;
}
