/*
* 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.moreover;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.math.BigInteger;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Date;
/**
* MoreoverClient is a Client for Moreover.
*/
public class MoreoverClient {
private static final Logger logger = LoggerFactory.getLogger(MoreoverClient.class);
private static final String BASE_URL = "http://metabase.moreover.com/api/v10/articles?key=%s&limit=%s&sequence_id=%s";
private final String id;
private String apiKey;
private BigInteger lastSequenceId = BigInteger.ZERO;
//testing purpose only
public long pullTime;
private boolean debug;
/**
* MoreoverClient constructor.
* @param id id
* @param apiKey apiKey
* @param sequence sequence
*/
public MoreoverClient(String id, String apiKey, String sequence) {
logger.info("Constructed new client for id:{} key:{} sequence:{}", id, apiKey, sequence);
this.id = id;
this.apiKey = apiKey;
this.lastSequenceId = new BigInteger(sequence);
}
/**
* get limit ArticlesAfter sequenceId.
* @param sequenceId sequenceId
* @param limit limit
* @return MoreoverResult
* @throws IOException IOException
*/
public MoreoverResult getArticlesAfter(String sequenceId, int limit) throws IOException {
String urlString = String.format(BASE_URL, this.apiKey, limit, sequenceId);
logger.debug("Making call to {}", urlString);
long start = System.nanoTime();
MoreoverResult result = new MoreoverResult(id, getArticles(new URL(urlString)), start, System.nanoTime());
if (!result.getMaxSequencedId().equals(BigInteger.ZERO)) {
this.lastSequenceId = result.getMaxSequencedId();
logger.debug("Maximum sequence from last call {}", this.lastSequenceId);
} else {
logger.debug("No maximum sequence returned in last call {}", this.lastSequenceId);
}
return result;
}
public MoreoverResult getNextBatch() throws IOException {
logger.debug("Getting next results for {} {} {}", this.id, this.apiKey, this.lastSequenceId);
return getArticlesAfter(this.lastSequenceId.toString(), 500);
}
private String getArticles2(URL url) throws IOException {
HttpURLConnection cn = (HttpURLConnection) url.openConnection();
cn.setRequestMethod("GET");
cn.addRequestProperty("Content-Type", "text/xml;charset=UTF-8");
cn.setDoInput(true);
cn.setDoOutput(false);
BufferedReader reader = new BufferedReader(new InputStreamReader(cn.getInputStream(), Charset.forName("UTF-8")));
String line = null;
StringBuilder builder = new StringBuilder();
String result = new String("".getBytes(Charset.forName("UTF-8")), Charset.forName("UTF-8"));
while ((line = reader.readLine()) != null) {
result += line;
}
pullTime = new Date().getTime();
return result;
}
private String getArticles(URL url) throws IOException {
HttpURLConnection cn = (HttpURLConnection) url.openConnection();
cn.setRequestMethod("GET");
cn.addRequestProperty("Content-Type", "text/xml;charset=UTF-8");
cn.setDoInput(true);
cn.setDoOutput(false);
StringWriter writer = new StringWriter();
IOUtils.copy(new InputStreamReader(cn.getInputStream(), Charset.forName("UTF-8")), writer);
writer.flush();
pullTime = new Date().getTime();
// added after seeing java.net.SocketException: Too many open files
cn.disconnect();
return writer.toString();
}
}