/**
* 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 with
* the License. You may obtain a copy of the License at
*
* 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.camel.component.twitter.consumer;
import java.util.List;
import org.apache.camel.Exchange;
import org.apache.camel.component.twitter.TwitterEndpoint;
import twitter4j.Paging;
import twitter4j.Twitter;
import twitter4j.TwitterException;
public abstract class TwitterConsumer {
/**
* Instance of TwitterEndpoint.
*/
protected final TwitterEndpoint endpoint;
/**
* The last tweet ID received.
*/
private long lastId;
protected TwitterConsumer(TwitterEndpoint endpoint) {
this.endpoint = endpoint;
this.lastId = -1;
}
/**
* Called by polling consumers during each poll. It needs to be separate
* from directConsume() since, as an example, streaming API polling allows
* tweets to build up between polls.
*/
public abstract List<Exchange> pollConsume() throws TwitterException;
/**
* Called by direct consumers.
*/
public abstract List<Exchange> directConsume() throws TwitterException;
/**
* Can't assume that the end of the list will be the most recent ID.
* The Twitter API sometimes returns them slightly out of order.
*/
protected void setLastIdIfGreater(long newId) {
if (newId > lastId) {
lastId = newId;
}
}
/**
* Support to update the Consumer's lastId when starting the consumer
*/
public void setLastId(long sinceId) {
lastId = sinceId;
}
protected Twitter getTwitter() {
return endpoint.getProperties().getTwitter();
}
protected long getLastId() {
return lastId;
}
protected Paging getLastIdPaging() {
return new Paging(lastId);
}
}