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/*
* ============LICENSE_START=======================================================
* policy-endpoints
* ================================================================================
* Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.endpoints.event.comm.bus.internal.impl;
import com.att.nsa.cambria.client.CambriaClientBuilders;
import com.att.nsa.cambria.client.CambriaClientBuilders.ConsumerBuilder;
import com.att.nsa.cambria.client.CambriaConsumer;
import java.io.IOException;
import java.net.MalformedURLException;
import java.security.GeneralSecurityException;
import java.util.List;
import org.onap.policy.common.endpoints.event.comm.bus.internal.FilterableBusConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Cambria based consumer
*/
public class CambriaConsumerWrapper implements FilterableBusConsumer {
/**
* logger
*/
private static Logger logger = LoggerFactory.getLogger(CambriaConsumerWrapper.class);
/**
* Used to build the consumer.
*/
private final ConsumerBuilder builder;
/**
* Locked while updating {@link #consumer} and {@link #newConsumer}.
*/
private final Object consLocker = new Object();
/**
* Cambria client
*/
private CambriaConsumer consumer;
/**
* Cambria client to use for next fetch
*/
private CambriaConsumer newConsumer = null;
/**
* fetch timeout
*/
protected int fetchTimeout;
/**
* close condition
*/
protected Object closeCondition = new Object();
/**
* Cambria Consumer Wrapper
*
* @param servers messaging bus hosts
* @param topic topic
* @param apiKey API Key
* @param apiSecret API Secret
* @param consumerGroup Consumer Group
* @param consumerInstance Consumer Instance
* @param fetchTimeout Fetch Timeout
* @param fetchLimit Fetch Limit
* @throws GeneralSecurityException
* @throws MalformedURLException
*/
public CambriaConsumerWrapper(List<String> servers, String topic, String apiKey, String apiSecret,
String consumerGroup, String consumerInstance, int fetchTimeout, int fetchLimit, boolean useHttps,
boolean useSelfSignedCerts) {
this(servers, topic, apiKey, apiSecret, null, null, consumerGroup, consumerInstance, fetchTimeout, fetchLimit,
useHttps, useSelfSignedCerts);
}
public CambriaConsumerWrapper(List<String> servers, String topic, String apiKey, String apiSecret, String username,
String password, String consumerGroup, String consumerInstance, int fetchTimeout, int fetchLimit,
boolean useHttps, boolean useSelfSignedCerts) {
this.fetchTimeout = fetchTimeout;
this.builder = new CambriaClientBuilders.ConsumerBuilder();
builder.knownAs(consumerGroup, consumerInstance).usingHosts(servers).onTopic(topic).waitAtServer(fetchTimeout)
.receivingAtMost(fetchLimit);
// Set read timeout to fetch timeout + 30 seconds (TBD: this should be configurable)
builder.withSocketTimeout(fetchTimeout + 30000);
if (useHttps) {
builder.usingHttps();
if (useSelfSignedCerts) {
builder.allowSelfSignedCertificates();
}
}
if (apiKey != null && !apiKey.isEmpty() && apiSecret != null && !apiSecret.isEmpty()) {
builder.authenticatedBy(apiKey, apiSecret);
}
if (username != null && !username.isEmpty() && password != null && !password.isEmpty()) {
builder.authenticatedByHttp(username, password);
}
try {
this.consumer = builder.build();
} catch (MalformedURLException | GeneralSecurityException e) {
throw new IllegalArgumentException(e);
}
}
@Override
public Iterable<String> fetch() throws IOException, InterruptedException {
try {
return getCurrentConsumer().fetch();
} catch (final IOException e) {
logger.error("{}: cannot fetch because of {} - backoff for {} ms.", this, e.getMessage(),
this.fetchTimeout);
synchronized (this.closeCondition) {
this.closeCondition.wait(this.fetchTimeout);
}
throw e;
}
}
@Override
public void close() {
synchronized (closeCondition) {
closeCondition.notifyAll();
}
getCurrentConsumer().close();
}
private CambriaConsumer getCurrentConsumer() {
CambriaConsumer old = null;
CambriaConsumer ret;
synchronized (consLocker) {
if (this.newConsumer != null) {
// replace old consumer with new consumer
old = this.consumer;
this.consumer = this.newConsumer;
this.newConsumer = null;
}
ret = this.consumer;
}
if (old != null) {
old.close();
}
return ret;
}
@Override
public void setFilter(String filter) {
logger.info("{}: setting DMAAP server-side filter: {}", this, filter);
builder.withServerSideFilter(filter);
try {
CambriaConsumer previous;
synchronized (consLocker) {
previous = this.newConsumer;
this.newConsumer = builder.build();
}
if (previous != null) {
// there was already a new consumer - close it
previous.close();
}
} catch (MalformedURLException | GeneralSecurityException e) {
/*
* Since an exception occurred, "consumer" still has its old value, thus it should not
* be closed at this point.
*/
throw new IllegalArgumentException(e);
}
}
@Override
public String toString() {
return "CambriaConsumerWrapper [fetchTimeout=" + fetchTimeout + "]";
}
}
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