/*
* 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.streams.core.StreamsDatum;
import com.google.common.collect.ImmutableSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Queue;
/**
* Task that pulls from the Morever API on behalf of MoreoverProvider.
*/
public class MoreoverProviderTask implements Runnable {
public static final int LATENCY = 10;
public static final int REQUIRED_LATENCY = LATENCY * 1000;
private static Logger logger = LoggerFactory.getLogger(MoreoverProviderTask.class);
private String lastSequence;
private final String apiKey;
private final Queue<StreamsDatum> results;
private final MoreoverClient moClient;
private boolean started = false;
/**
* MoreoverProviderTask constructor.
* @param apiId apiId
* @param apiKey apiKey
* @param results results
* @param lastSequence lastSequence
*/
public MoreoverProviderTask(String apiId, String apiKey, Queue<StreamsDatum> results, String lastSequence) {
//logger.info("Constructed new task {} for {} {} {}", UUID.randomUUID().toString(), apiId, apiKey, lastSequence);
this.apiKey = apiKey;
this.results = results;
this.lastSequence = lastSequence;
this.moClient = new MoreoverClient(apiId, this.apiKey, this.lastSequence);
initializeClient(moClient);
}
@Override
public void run() {
while (true) {
try {
ensureTime(moClient);
MoreoverResult result = moClient.getArticlesAfter(lastSequence, 500);
started = true;
lastSequence = result.process().toString();
for (StreamsDatum entry : ImmutableSet.copyOf(result.iterator())) {
results.offer(entry);
}
logger.info("ApiKey={}\tlastSequenceid={}", this.apiKey, lastSequence);
} catch (Exception ex) {
logger.error("Exception while polling moreover", ex);
}
}
}
private void ensureTime(MoreoverClient moClient) {
try {
long gap = System.currentTimeMillis() - moClient.pullTime;
if (gap < REQUIRED_LATENCY) {
Thread.sleep(REQUIRED_LATENCY - gap);
}
} catch (Exception ex) {
logger.warn("Error sleeping for latency");
}
}
private void initializeClient(MoreoverClient moClient) {
try {
moClient.getArticlesAfter(this.lastSequence, 2);
} catch (Exception ex) {
logger.error("Failed to start stream, {}", this.apiKey);
logger.error("Exception : ", ex);
throw new IllegalStateException("Unable to initialize stream", ex);
}
}
}