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Client library for working with the NATS messaging system.
// Copyright 2015-2018 The NATS Authors
// 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.
package io.nats.client.impl;
import io.nats.client.support.DateTimeUtils;
import java.time.ZonedDateTime;
/**
* Jetstream Metadata about a message, when applicable.
*/
public class NatsJetStreamMetaData {
private final String prefix;
private final String domain;
private final String accountHash;
private final String stream;
private final String consumer;
private final long delivered;
private final long streamSeq;
private final long consumerSeq;
private final ZonedDateTime timestamp;
private final long pending;
@Override
public String toString() {
return "NatsJetStreamMetaData{" +
"prefix='" + prefix + '\'' +
", domain='" + domain + '\'' +
", stream='" + stream + '\'' +
", consumer='" + consumer + '\'' +
", delivered=" + delivered +
", streamSeq=" + streamSeq +
", consumerSeq=" + consumerSeq +
", timestamp=" + timestamp +
", pending=" + pending +
'}';
}
/*
v0 .ACK......
v1 .ACK.......
v2 .ACK.........
*/
public NatsJetStreamMetaData(NatsMessage natsMessage) {
if (!natsMessage.isJetStream()) {
throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
}
String[] parts = natsMessage.getReplyTo().split("\\.");
if (parts.length < 8 || !"ACK".equals(parts[1])) {
throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
}
int streamIndex;
boolean hasPending;
boolean hasDomainAndHash;
if (parts.length == 8) {
streamIndex = 2;
hasPending = false;
hasDomainAndHash = false;
}
else if (parts.length == 9) {
streamIndex = 2;
hasPending = true;
hasDomainAndHash = false;
}
else if (parts.length >= 11) {
streamIndex = 4;
hasPending = true;
hasDomainAndHash = true;
}
else {
throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
}
try {
prefix = parts[0];
// "ack" = parts[1]
domain = hasDomainAndHash ? parts[2] : null;
accountHash = hasDomainAndHash ? parts[3] : null;
stream = parts[streamIndex];
consumer = parts[streamIndex + 1];
delivered = Long.parseLong(parts[streamIndex + 2]);
streamSeq = Long.parseLong(parts[streamIndex + 3]);
consumerSeq = Long.parseLong(parts[streamIndex + 4]);
timestamp = DateTimeUtils.parseDateTimeNanos(parts[streamIndex + 5]);
pending = hasPending ? Long.parseLong(parts[streamIndex + 6]) : -1L;
}
catch (Exception e) {
throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
}
}
/**
* Get the domain for the message. Might be null
* @return the domain
*/
public String getDomain() {
return domain;
}
/**
* Gets the stream the message is from.
*
* @return the stream.
*/
public String getStream() {
return stream;
}
/**
* Gets the consumer that generated this message.
*
* @return the consumer.
*/
public String getConsumer() {
return consumer;
}
/**
* Gets the number of times this message has been delivered.
*
* @return delivered count.
*/
public long deliveredCount() {
return delivered;
}
/**
* Gets the stream sequence number of the message.
*
* @return sequence number
*/
public long streamSequence() {
return streamSeq;
}
/**
* Gets consumer sequence number of this message.
*
* @return sequence number
*/
public long consumerSequence() {
return consumerSeq;
}
/**
* Gets the pending count of the consumer.
*
* @return pending count
*/
public long pendingCount() {
return pending;
}
/**
* Gets the timestamp of the message.
*
* @return the timestamp
*/
public ZonedDateTime timestamp() {
return timestamp;
}
String getAccountHash() {
return accountHash;
}
private String notAJetStreamMessage(String reply) {
return "Message is not a JetStream message. ReplySubject: <" + reply + ">";
}
}
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