polling of feeds in FeedEntryPollingConsumer is broken.
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Key: CAMEL-3124
URL: https://issues.apache.org/activemq/browse/CAMEL-3124
Project: Apache Camel
Issue Type: Bug
Components: camel-rss
Affects Versions: 2.4.0
Environment: ubuntu 10.4
java 6
Reporter: Ernst Bunders
The FeedEntryPollingConsumer class implements the poll() method for the
'splitEntries' mode of the RssEndpoint is broken. You can think of two ways
that polling feeds could work:
1) A feed is created, then one item is processed, then the delay, then process
another item. This way the feed is kept between calls to poll().
2) A feed is created, then all the items are processed, the feed is cleared,
and then the delay.
But the way it presently works:
- A feed is created, one items is processed, and the feed is cleared, then the
delay, and again the feed is created and the next item is cleared.
This is clearly wrong. Feed entries can be missed, because the index of the
next item to process is stored over polls but the list isn't. Also this creates
a big network overhead when polling very active feeds such as twitter search...
This is easy to fix. In the below code:
public void poll() throws Exception {
Object feed = createFeed();
populateList(feed);
while (hasNextEntry()) {
Object entry = list.get(entryIndex--);
boolean valid = true;
if (entryFilter != null) {
valid = entryFilter.isValidEntry(endpoint, feed, entry);
}
if (valid) {
Exchange exchange = endpoint.createExchange(feed, entry);
getProcessor().process(exchange);
// return and wait for the next poll to continue from last time
(this consumer is stateful)
return;
}
}
The return (at line 56 of
org.apache.camel.component.feed.FeedEntryPollingConsumer) should be deleted.
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