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1
Stream-style messaging
development in Java
The NoJMS way
October 1, 2015
2
Problems of traditional way
Integration system
working is…
3
Problems of traditional way
Integration system
working is…
4
Problems of traditional way
Integration system
working is…
5
Problems of traditional way
Integration system
working is…
6
Problems of traditional way
«There's no such thing as problems,
Mr. Green, only situations...»
Avi, «Revolver»
7
Problems of traditional way - Architecture
Internet/Intranet
Application Server
Cluster
Database Cluster
8
Problems of traditional way - Architecture
Internet/Intranet
Application Server
Cluster
Database Cluster
First
another
application
Server
Cluster
9
Problems of traditional way - Architecture
Internet/Intranet
Application Server
Cluster
Database Cluster
First
another
application
Server
Cluster
…
Second
another
application
Server
Cluster
10
Problems of traditional way - Architecture
Internet/Intranet
Application Server
Cluster
Database Cluster
First
another
application
Server
Cluster
…
Second
another
application
Server
Cluster
11
Problems of traditional way - Architecture
Internet/Intranet
Application Server
Cluster
Database Cluster
First
another
application
Server
Cluster
…
Second
another
application
Server
Cluster
12
Internet/Intranet
Application Server
Cluster
Database Cluster
First
another
application
Server
Cluster
…
Second
another
application
Server
Cluster
Problems of traditional way - Architecture
13
Internet/Intranet
Application Server
Cluster
Database Cluster
First
another
application
Server
Cluster
…
Second
another
application
Server
Cluster
Problems of traditional way - Architecture
14
Problems of traditional way
«Actually, the cause of computer revolution is not that
calculator become faster and get a lot of memory, get
possibility to show as advanced graphics, and so on; but that
cause is that computer can connect to another computer. So,
computer is not, as usually described, the result of calculator
evolution – it`s result of telephone evolution!»
Andrey Verbitsky,
«SoftwarePeople 2009»
15
Problems of traditional way
16
Problems of traditional way
WSDL/SOAP web-services (XML)1
17
Problems of traditional way
WSDL/SOAP web-services (XML)1
RESTful web-services (JSON)2
18
Problems of traditional way
WSDL/SOAP web-services (XML)1
RESTful web-services (JSON)2
JMS (Java standard Serialization)3
19
1. Messages size
Problems of traditional way - WSDL/SOAP web-services
20
1. Messages size
2. Validation via schema
Problems of traditional way - WSDL/SOAP web-services
21
1. Messages size
2. Validation via schema
3. Synchronous model
Problems of traditional way - WSDL/SOAP web-services
22
1. Messages size
2. Validation via schema
3. Synchronous model
4. HTTP(S)
Problems of traditional way - WSDL/SOAP web-services
23
1. Messages Size
Problems of traditional way – RESTful/JSON web-services
24
1. Messages Size
2. Validation?
Problems of traditional way – RESTful/JSON web-services
25
1. Messages Size
2. Validation?
3. Synchronous model
Problems of traditional way – RESTful/JSON web-services
26
1. Messages Size
2. Validation?
3. Synchronous model
4. HTTP(S)
Problems of traditional way – RESTful/JSON web-services
27
1. Java only!
Problems of traditional way – JMS
28
1. Java only!
2. Messages Size
Problems of traditional way – JMS
29
1. Java only!
2. Messages Size
3. Lots of code (except JMS 2.0 in JEE7)
Problems of traditional way – JMS
30
1. Java only!
2. Messages Size
3. Lots of code (except JMS 2.0 in JEE7)
4. Lost messages
Problems of traditional way – JMS
31
1. Java only!
2. Messages Size
3. Lots of code (except JMS 2.0 in JEE7)
4. Lost messages
5. Duplicates
Problems of traditional way – JMS
32
1. Enterprise Integration Patterns
2. Apache Camel
3. Spring Integration
Modern alternatives
33
Modern alternatives – Apache Camel
@Override
public void configure() throws Exception {
from("direct:start")
.split().method("sectionRequestSplitterBean", "split")
.aggregationStrategy(new ReportAggregationStrategy())
.transform().method("sectionRequestToXMLBean", "transform")
.to(serviceURL)
.transform().method("sectionResponseXMLToSectionBean", "transform");
}
public void setServiceURL(String serviceURL) {
this.serviceURL = serviceURL;
}
34
Modern alternatives
35
1. File Transfer
2. Shared Database
3. Remote Procedure Call
4. Messaging
Modern alternatives
36
Problems of coding
1. Synchronous vs Asynchronous
2. Systems Integration or Distributed System?
3. Do we really need a Bus (Mediator)?
4. Back pressure (Reactive Streams – Erlang, Scala, Java)
Modern alternatives
37
1. http://queues.io (~26 decisions)
2. Local BlockingQueue (“seda” in Apache Camel, JdbcChannelMessageStore in Spring Integration)
3. ZooKeeper
4. JCache (Hazelcast)
5. In-memory NoSQL DB (Redis, DertyDB,…)
6. AMQP (ActiveMQ, RabbitMQ)
7. ZeroMQ
8. Amazon SQS
9. Apache Kafka (ZooKeeper inside!)
Modern alternatives
38
Modern alternatives - AMQP (ActiveMQ, RabbitMQ)
39
Modern alternatives – Apache Kafka
40
Modern alternatives – Apache Kafka
1. Shared write-ahead log
• partitions
41
Modern alternatives – Apache Kafka
42
Stream-style code
43
Stream-style code
@Autowired
ParametrizedConsumer<OneFieldBean> simpleAmqpReceiver;
@Test
public void priyomSoobshcheniy() throws Exception {
simpleAmqpReceiver.objectStream(OneFieldBean.class)
.forEach(object -> out.println(object.getS()));
}
44
Stream-style code
private static int ITERATIONS_NUMBER = 1_000;
@Autowired private Sender<OneFieldBean> sender;
private Benchmark benchmark = new Benchmark(out::println);
@Test
public void prostaiaPosilkaSoobshcheniy() throws Exception {
benchmark.benchmarkOperation(() -> {
for (int i = 1; i < ITERATIONS_NUMBER; )
sender.sendMessage(new SimpleOneFieldBean().setS("тест " +
i++));
return "done!";
}, "Послано за (сек.): ");
}
45
Stream-style code
private static int ITERATIONS_NUMBER = 1_000;
@Test
public void posilkaSoobshcheniyCherezStream() {
benchmark.benchmarkOperation(() -> {
sender.streamSending(
new Iterator<OneFieldBean>() {
AtomicInteger i = new AtomicInteger(0);
@Override public boolean hasNext() {
return i.get() < ITERATIONS_NUMBER;
}
@Override public OneFieldBean next() {
return new SimpleOneFieldBean().setS("тест " + i.getAndIncrement());
}
}
);
return "done!";
}, "Послано за (сек.): ");
}
46
Stream-style code
@POST
@Produces({“application/x-msgpack; qs=1”, “application/json; qs=0.75”})
public Order getOrder() {
// …
}

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