/*
* 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;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.facebook.FacebookConfiguration;
import org.apache.streams.facebook.IdConfig;
import org.apache.streams.util.api.requests.backoff.BackOffStrategy;
import org.apache.streams.util.api.requests.backoff.impl.ExponentialBackOffStrategy;
import org.apache.streams.util.oauth.tokens.tokenmanager.SimpleTokenManager;
import org.apache.streams.util.oauth.tokens.tokenmanager.impl.BasicTokenManager;
import com.google.common.annotations.VisibleForTesting;
import facebook4j.Facebook;
import facebook4j.FacebookFactory;
import facebook4j.conf.ConfigurationBuilder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Abstract data collector for Facebook. Iterates over ids and queues data to be output
* by a {@link org.apache.streams.core.StreamsProvider}
*/
public abstract class FacebookDataCollector implements Runnable {
private static final Logger LOGGER = LoggerFactory.getLogger(FacebookDataCollector.class);
private static final String READ_ONLY = "read_streams";
@VisibleForTesting
protected AtomicBoolean isComplete;
protected BackOffStrategy backOff;
private FacebookConfiguration config;
private BlockingQueue<StreamsDatum> queue;
private SimpleTokenManager<String> authTokens;
/**
* FacebookDataCollector constructor.
* @param config config
* @param queue queue
*/
public FacebookDataCollector(FacebookConfiguration config, BlockingQueue<StreamsDatum> queue) {
this.config = config;
this.queue = queue;
this.isComplete = new AtomicBoolean(false);
this.backOff = new ExponentialBackOffStrategy(5);
this.authTokens = new BasicTokenManager<>();
if (config.getUserAccessTokens() != null) {
for (String token : config.getUserAccessTokens()) {
this.authTokens.addTokenToPool(token);
}
}
}
/**
* Returns true when the collector has finished querying facebook and has queued all data
* for the provider.
* @return isComplete
*/
public boolean isComplete() {
return this.isComplete.get();
}
/**
* Queues facebook data.
* @param data data
* @param id id
*/
protected void outputData(Object data, String id) {
try {
this.queue.put(new StreamsDatum(data, id));
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
/**
* Gets a Facebook client. If multiple authenticated users for this app are available
* it will rotate through the users oauth credentials
* @return client
*/
protected Facebook getNextFacebookClient() {
ConfigurationBuilder cb = new ConfigurationBuilder();
cb.setDebugEnabled(true);
cb.setOAuthPermissions(READ_ONLY);
cb.setOAuthAppId(this.config.getOauth().getAppId());
cb.setOAuthAppSecret(this.config.getOauth().getAppSecret());
if (this.authTokens.numAvailableTokens() > 0) {
cb.setOAuthAccessToken(this.authTokens.getNextAvailableToken());
} else {
cb.setOAuthAccessToken(this.config.getOauth().getAppAccessToken());
LOGGER.debug("appAccessToken : {}", this.config.getOauth().getAppAccessToken());
}
cb.setJSONStoreEnabled(true);
if (StringUtils.isNotEmpty(config.getVersion())) {
cb.setRestBaseURL("https://graph.facebook.com/" + config.getVersion() + "/");
}
LOGGER.debug("appId : {}", this.config.getOauth().getAppId());
LOGGER.debug("appSecret: {}", this.config.getOauth().getAppSecret());
FacebookFactory ff = new FacebookFactory(cb.build());
return ff.getInstance();
}
/**
* Queries facebook and queues the resulting data.
* @param id id
* @throws Exception Exception
*/
protected abstract void getData(IdConfig id) throws Exception;
@Override
public void run() {
for ( IdConfig id : this.config.getIds()) {
try {
getData(id);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
} catch (Exception ex) {
LOGGER.error("Caught Exception while trying to poll data for page : {}", id);
LOGGER.error("Exception while getting page feed data: {}", ex);
}
}
this.isComplete.set(true);
}
@VisibleForTesting
protected BlockingQueue<StreamsDatum> getQueue() {
return queue;
}
}