/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.streams.facebook.provider.page;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.facebook.FacebookConfiguration;
import org.apache.streams.facebook.IdConfig;
import org.apache.streams.facebook.provider.FacebookDataCollector;
import org.apache.streams.jackson.StreamsJacksonMapper;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.annotations.VisibleForTesting;
import facebook4j.FacebookException;
import facebook4j.Page;
import facebook4j.json.DataObjectFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.BlockingQueue;
/**
* Collects the page data from public Facebook pages.
*/
public class FacebookPageDataCollector extends FacebookDataCollector {
private static final Logger LOGGER = LoggerFactory.getLogger(FacebookPageDataCollector.class);
private static final int MAX_ATTEMPTS = 5;
private static final ObjectMapper MAPPER = StreamsJacksonMapper.getInstance();
public FacebookPageDataCollector(BlockingQueue<StreamsDatum> queue, FacebookConfiguration configuration) {
super(configuration, queue);
}
@Override
protected void getData(IdConfig id) throws Exception {
Page responsePage = getPage(id.getId());
backOff.reset();
if (responsePage != null) {
super.outputData(MAPPER.readValue(DataObjectFactory.getRawJSON(responsePage), org.apache.streams.facebook.Page.class), responsePage.getId());
}
}
protected Page getPage(String pageId) throws Exception {
int attempt = 0;
while (attempt < MAX_ATTEMPTS) {
++attempt;
try {
return getNextFacebookClient().getPage(pageId);
} catch (FacebookException fe) {
LOGGER.error("Facebook returned an exception : {}", fe);
LOGGER.error("Facebook returned an exception while trying to get feed for page, {} : {}", pageId, fe.getMessage());
int errorCode = fe.getErrorCode();
//Some sort of rate limiting
if (errorCode == 17 || errorCode == 4 || errorCode == 341) {
super.backOff.backOff();
}
}
}
throw new Exception("Failed to get data from facebook after " + MAX_ATTEMPTS);
}
@VisibleForTesting
protected BlockingQueue<StreamsDatum> getQueue() {
return super.getQueue();
}
}