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/*******************************************************************************
* ============LICENSE_START=======================================================
* org.onap.dmaap
* ================================================================================
* Copyright © 2017 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=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*
*******************************************************************************/
package com.att.dmf.mr.metrics.publisher.impl;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.zip.GZIPOutputStream;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Response;
import com.att.ajsc.filemonitor.AJSCPropertiesMap;
import com.att.dmf.mr.constants.CambriaConstants;
import com.att.dmf.mr.metrics.publisher.CambriaPublisherUtility;
/**
*
* class DMaaPCambriaSimplerBatchPublisher used to send the publish the messages
* in batch
*
* @author anowarul.islam
*
*/
public class DMaaPCambriaSimplerBatchPublisher extends CambriaBaseClient
implements com.att.dmf.mr.metrics.publisher.CambriaBatchingPublisher {
/**
*
* static inner class initializes with urls, topic,batchSize
*
* @author anowarul.islam
*
*/
public static class Builder {
public Builder() {
}
/**
* constructor initialize with url
*
* @param baseUrls
* @return
*
*/
public Builder againstUrls(Collection<String> baseUrls) {
fUrls = baseUrls;
return this;
}
/**
* constructor initializes with topics
*
* @param topic
* @return
*
*/
public Builder onTopic(String topic) {
fTopic = topic;
return this;
}
/**
* constructor initilazes with batch size and batch time
*
* @param maxBatchSize
* @param maxBatchAgeMs
* @return
*
*/
public Builder batchTo(int maxBatchSize, long maxBatchAgeMs) {
fMaxBatchSize = maxBatchSize;
fMaxBatchAgeMs = maxBatchAgeMs;
return this;
}
/**
* constructor initializes with compress
*
* @param compress
* @return
*/
public Builder compress(boolean compress) {
fCompress = compress;
return this;
}
/**
* method returns DMaaPCambriaSimplerBatchPublisher object
*
* @return
*/
public DMaaPCambriaSimplerBatchPublisher build() {
try {
return new DMaaPCambriaSimplerBatchPublisher(fUrls, fTopic, fMaxBatchSize, fMaxBatchAgeMs, fCompress);
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
private Collection<String> fUrls;
private String fTopic;
private int fMaxBatchSize = 100;
private long fMaxBatchAgeMs = 1000;
private boolean fCompress = false;
};
/**
*
* @param partition
* @param msg
*/
@Override
public int send(String partition, String msg) {
return send(new message(partition, msg));
}
/**
* @param msg
*/
@Override
public int send(message msg) {
final LinkedList<message> list = new LinkedList<message>();
list.add(msg);
return send(list);
}
/**
* @param msgs
*/
@Override
public synchronized int send(Collection<message> msgs) {
if (fClosed) {
throw new IllegalStateException("The publisher was closed.");
}
for (message userMsg : msgs) {
fPending.add(new TimestampedMessage(userMsg));
}
return getPendingMessageCount();
}
/**
* getPending message count
*/
@Override
public synchronized int getPendingMessageCount() {
return fPending.size();
}
/**
*
* @exception InterruptedException
* @exception IOException
*/
@Override
public void close() {
try {
final List<message> remains = close(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
if (remains.isEmpty()) {
getLog().warn("Closing publisher with " + remains.size() + " messages unsent. "
+ "Consider using CambriaBatchingPublisher.close( long timeout, TimeUnit timeoutUnits ) to recapture unsent messages on close.");
}
} catch (InterruptedException e) {
getLog().warn("Possible message loss. " + e.getMessage(), e);
} catch (IOException e) {
getLog().warn("Possible message loss. " + e.getMessage(), e);
}
}
/**
* @param time
* @param unit
*/
@Override
public List<message> close(long time, TimeUnit unit) throws IOException, InterruptedException {
synchronized (this) {
fClosed = true;
// stop the background sender
fExec.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
fExec.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
fExec.shutdown();
}
final long now = Clock.now();
final long waitInMs = TimeUnit.MILLISECONDS.convert(time, unit);
final long timeoutAtMs = now + waitInMs;
while (Clock.now() < timeoutAtMs && getPendingMessageCount() > 0) {
send(true);
Thread.sleep(250);
}
// synchronizing the current object
synchronized (this) {
final LinkedList<message> result = new LinkedList<message>();
fPending.drainTo(result);
return result;
}
}
/**
* Possibly send a batch to the cambria server. This is called by the
* background thread and the close() method
*
* @param force
*/
private synchronized void send(boolean force) {
if (force || shouldSendNow()) {
if (!sendBatch()) {
getLog().warn("Send failed, " + fPending.size() + " message to send.");
// note the time for back-off
fDontSendUntilMs = sfWaitAfterError + Clock.now();
}
}
}
/**
*
* @return
*/
private synchronized boolean shouldSendNow() {
boolean shouldSend = false;
if (fPending.isEmpty()) {
final long nowMs = Clock.now();
shouldSend = (fPending.size() >= fMaxBatchSize);
if (!shouldSend) {
final long sendAtMs = fPending.peek().timestamp + fMaxBatchAgeMs;
shouldSend = sendAtMs <= nowMs;
}
// however, wait after an error
shouldSend = shouldSend && nowMs >= fDontSendUntilMs;
}
return shouldSend;
}
/**
*
* @return
*/
private synchronized boolean sendBatch() {
// it's possible for this call to be made with an empty list. in this
// case, just return.
if (fPending.isEmpty()) {
return true;
}
final long nowMs = Clock.now();
final String url = CambriaPublisherUtility.makeUrl(fTopic);
getLog().info("sending " + fPending.size() + " msgs to " + url + ". Oldest: "
+ (nowMs - fPending.peek().timestamp) + " ms");
try {
final ByteArrayOutputStream baseStream = new ByteArrayOutputStream();
OutputStream os = baseStream;
if (fCompress) {
os = new GZIPOutputStream(baseStream);
}
for (TimestampedMessage m : fPending) {
os.write(("" + m.fPartition.length()).getBytes());
os.write('.');
os.write(("" + m.fMsg.length()).getBytes());
os.write('.');
os.write(m.fPartition.getBytes());
os.write(m.fMsg.getBytes());
os.write('\n');
}
os.close();
final long startMs = Clock.now();
// code from REST Client Starts
// final String serverCalculatedSignature = sha1HmacSigner.sign
// ("2015-09-21T11:38:19-0700", "iHAxArrj6Ve9JgmHvR077QiV");
Client client = ClientBuilder.newClient();
String metricTopicname = AJSCPropertiesMap.getProperty(CambriaConstants.msgRtr_prop,"metrics.send.cambria.topic");
if (null==metricTopicname) {
metricTopicname="msgrtr.apinode.metrics.dmaap";
}
WebTarget target = client
.target("http://localhost:" + CambriaConstants.kStdCambriaServicePort);
target = target.path("/events/" + fTopic);
getLog().info("url : " + target.getUri().toString());
// API Key
Entity<byte[]> data = Entity.entity(baseStream.toByteArray(), "application/cambria");
Response response = target.request().post(data);
// header("X-CambriaAuth",
// "2OH46YIWa329QpEF:"+serverCalculatedSignature).
// header("X-CambriaDate", "2015-09-21T11:38:19-0700").
// post(Entity.json(baseStream.toByteArray()));
getLog().info("Response received :: " + response.getStatus());
getLog().info("Response received :: " + response.toString());
// code from REST Client Ends
/*
* final JSONObject result = post ( url, contentType,
* baseStream.toByteArray(), true ); final String logLine =
* "cambria reply ok (" + (Clock.now()-startMs) + " ms):" +
* result.toString (); getLog().info ( logLine );
*/
fPending.clear();
return true;
} catch (IllegalArgumentException x) {
getLog().warn(x.getMessage(), x);
}
/*
* catch ( HttpObjectNotFoundException x ) { getLog().warn (
* x.getMessage(), x ); } catch ( HttpException x ) { getLog().warn (
* x.getMessage(), x ); }
*/
catch (IOException x) {
getLog().warn(x.getMessage(), x);
}
return false;
}
private final String fTopic;
private final int fMaxBatchSize;
private final long fMaxBatchAgeMs;
private final boolean fCompress;
private boolean fClosed;
private final LinkedBlockingQueue<TimestampedMessage> fPending;
private long fDontSendUntilMs;
private final ScheduledThreadPoolExecutor fExec;
private static final long sfWaitAfterError = 1000;
/**
*
* @param hosts
* @param topic
* @param maxBatchSize
* @param maxBatchAgeMs
* @param compress
*/
private DMaaPCambriaSimplerBatchPublisher(Collection<String> hosts, String topic, int maxBatchSize,
long maxBatchAgeMs, boolean compress) throws MalformedURLException {
super(hosts);
if (topic == null || topic.length() < 1) {
throw new IllegalArgumentException("A topic must be provided.");
}
fClosed = false;
fTopic = topic;
fMaxBatchSize = maxBatchSize;
fMaxBatchAgeMs = maxBatchAgeMs;
fCompress = compress;
fPending = new LinkedBlockingQueue<TimestampedMessage>();
fDontSendUntilMs = 0;
fExec = new ScheduledThreadPoolExecutor(1);
fExec.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
send(false);
}
}, 100, 50, TimeUnit.MILLISECONDS);
}
/**
*
*
* @author anowarul.islam
*
*/
private static class TimestampedMessage extends message {
/**
* to store timestamp value
*/
public final long timestamp;
/**
* constructor initialize with message
*
* @param m
*
*/
public TimestampedMessage(message m) {
super(m);
timestamp = Clock.now();
}
}
}
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