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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* Licensed 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.onap.appc.client.impl.protocol;
import com.att.nsa.cambria.client.CambriaClientBuilders.ConsumerBuilder;
import com.att.nsa.cambria.client.CambriaConsumer;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.MalformedURLException;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
class ConsumerImpl implements Consumer {
private static final int DEFAULT_LIMIT = 1000;
private Collection<String> hosts;
private String topic;
private String group;
private String groupId;
private int timeout;
private String authKey;
private String authSecret;
private CambriaConsumer consumer = null;
/**
* constructor
* @param urls
* @param topicName
* @param consumerName
* @param consumerId
* @param timeout
*/
public ConsumerImpl(Collection<String> urls, String topicName, String consumerName, String consumerId, Integer timeout, String apiKey, String apiSecret) throws MalformedURLException, GeneralSecurityException, NoSuchFieldException, IllegalAccessException {
this.hosts = urls;
this.topic = topicName;
this.group = consumerName;
this.groupId = consumerId;
this.authKey = apiKey;
this.authSecret = apiSecret;
this.timeout = timeout;
consumer = getConsumer();
}
public List<String> fetch() throws IOException {
return fetch(DEFAULT_LIMIT);
}
public List<String> fetch(int limit) throws IOException {
List<String> out = new ArrayList<String>();
try {
for(String msg : consumer.fetch(timeout,limit)){
out.add(msg);
}
} catch (IOException e) {
throw e;
}
return out;
}
public void registerForRead() throws IOException {
int waitForRegisteration = 1; //return from fetch after 1ms, no need to read any messages
consumer.fetch(waitForRegisteration, 1);
}
/**
* init cambria consumer
* @return CambriaConsumer
*/
private CambriaConsumer getConsumer() throws MalformedURLException, GeneralSecurityException, NoSuchFieldException, IllegalAccessException {
ConsumerBuilder builder = new ConsumerBuilder();
builder.usingHosts(hosts).onTopic(topic).knownAs(group, groupId);
builder.withSocketTimeout(timeout + 5000).waitAtServer(timeout);
builder.receivingAtMost(DEFAULT_LIMIT);
// Add credentials if provided
if (authKey != null && authSecret != null) {
Field apiKeyField = ConsumerBuilder.class.getDeclaredField("fApiKey");
apiKeyField.setAccessible(true);
apiKeyField.set(builder, "");
builder.authenticatedBy(authKey, authSecret);
}
return builder.build();
}
@Override
public void close() {
consumer.close();
}
}
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