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Merge remote-tracking branch 'upstream/master'

This commit is contained in:
Simone Cusimano 2020-10-21 09:27:04 +02:00
parent f8a35260b2 147a5e157f
commit e521146f8f
23 changed files with 729 additions and 0 deletions
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6
core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Animal.java Normal file
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package com.baeldung.exceptions.classcastexception;
public interface Animal {
String getName();
}

14
core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Box.java Normal file
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package com.baeldung.exceptions.classcastexception;
public class Box<T> {
private T content;
public T getContent() {
return content;
}
public void setContent(T content) {
this.content = content;
}
}

9
core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Frog.java Normal file
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package com.baeldung.exceptions.classcastexception;
public class Frog extends Reptile {
@Override
public String getName() {
return super.getName() + ": Frog";
}
}

9
core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Mammal.java Normal file
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package com.baeldung.exceptions.classcastexception;
public class Mammal implements Animal {
@Override
public String getName() {
return "Mammal";
}
}

9
core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Reptile.java Normal file
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package com.baeldung.exceptions.classcastexception;
public class Reptile implements Animal {
@Override
public String getName() {
return "Reptile";
}
}

40
core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/CheckedCastsUnitTest.java Normal file
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package com.baeldung.exceptions.classcastexception;
import org.junit.Test;
import java.io.Serializable;
public class CheckedCastsUnitTest {
@Test(expected = ClassCastException.class)
public void givenBaseTypeVariableReferencingChildInstance_whenCastToIncompatibleSubtype_thenClassCastException() {
Animal animal = new Frog();
//A checked downcast to Mammal is incompatible from Frog because Frog is not a subtype of Mammal.
Mammal mammal = (Mammal) animal;
}
@Test(expected = ClassCastException.class)
public void givenBaseTypeVariableReferencingChildInstance_whenCastToIncompatibleInterface_thenClassCastException() {
Animal animal = new Frog();
//A checked cast to Serializable is incompatible from Frog because Frog is not a subtype of Serializable.
Serializable serial = (Serializable) animal;
}
@Test(expected = ClassCastException.class)
public void givenObjectVariableReferencingPrimitiveArray_whenCastToBoxedTypeArray_thenClassCastException() {
Object primitives = new int[1];
//A checked cast to Integer[] is incompatible from primitive arrays. Auto-boxing does not work for arrays.
Integer[] integers = (Integer[]) primitives;
}
@Test(expected = ClassCastException.class)
public void givenObjectVariableReferencingPrimitiveArray_whenCastToPromotedTypeArray_thenClassCastException() {
Object primitives = new int[1];
//A checked cast to long[] is incompatible from int[]. Type promotion does not work for arrays.
long[] longs = (long[]) primitives;
}
}

21
core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/GenericConversionUnitTest.java Normal file
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package com.baeldung.exceptions.classcastexception;
import org.junit.Test;
public class GenericConversionUnitTest {
@Test(expected = ClassCastException.class)
public void givenIncompatibleType_whenConvertInstanceOfObject_thenClassCastException() {
// Should have been null, but due to type erasure, inside convertInstanceOfObject,
// it will attempt to cast to Object instead of String, so it casts to Object, which is always possible.
String shouldBeNull = convertInstanceOfObject(123);
}
public static <T> T convertInstanceOfObject(Object o) {
try {
return (T) o; // Casts to Object due to type erasure
} catch (ClassCastException e) {
return null; // Will never reach this
}
}
}

17
core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/UncheckedConversionUnitTest.java Normal file
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package com.baeldung.exceptions.classcastexception;
import org.junit.Test;
public class UncheckedConversionUnitTest {
@Test(expected = ClassCastException.class)
public void givenPollutedGenericType_whenGetProperty_thenClassCastException() {
Box<Long> originalBox = new Box<>();
Box raw = originalBox;
raw.setContent(2.5);
Box<Long> bound = (Box<Long>) raw;
//An incompatible element was found in the raw box.
Long content = bound.getContent();
}
}

78
netflix-modules/mantis/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>mantis</artifactId>
<name>Mantis</name>
<packaging>jar</packaging>
<description>Sample project for Netflix Mantis</description>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-2</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>io.mantisrx</groupId>
<artifactId>mantis-runtime</artifactId>
<version>1.2.63</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.10.2</version>
</dependency>
<dependency>
<groupId>net.andreinc.mockneat</groupId>
<artifactId>mockneat</artifactId>
<version>0.3.8</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webflux</artifactId>
<version>5.0.9.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.projectreactor.netty</groupId>
<artifactId>reactor-netty</artifactId>
<version>0.9.12.RELEASE</version>
<scope>test</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<id>SpringLibReleaseRepo</id>
<url>https://repo.spring.io/libs-release/</url>
</repository>
</repositories>
</project>

23
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/MantisApplication.java Normal file
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package com.baeldung.netflix.mantis;
import com.baeldung.netflix.mantis.job.LogAggregationJob;
import io.mantisrx.runtime.executor.LocalJobExecutorNetworked;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@Slf4j
@SpringBootApplication
public class MantisApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(MantisApplication.class, args);
}
@Override
public void run(String... args) {
LocalJobExecutorNetworked.execute(new LogAggregationJob().getJobInstance());
}
}

37
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/job/LogAggregationJob.java Normal file
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package com.baeldung.netflix.mantis.job;
import com.baeldung.netflix.mantis.model.LogAggregate;
import com.baeldung.netflix.mantis.source.RandomLogSource;
import com.baeldung.netflix.mantis.stage.CountLogStage;
import com.baeldung.netflix.mantis.stage.GroupLogStage;
import com.baeldung.netflix.mantis.stage.TransformLogStage;
import io.mantisrx.runtime.Job;
import io.mantisrx.runtime.MantisJob;
import io.mantisrx.runtime.MantisJobProvider;
import io.mantisrx.runtime.Metadata;
import io.mantisrx.runtime.sink.Sink;
import io.mantisrx.runtime.sink.Sinks;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
@NoArgsConstructor
@AllArgsConstructor
public class LogAggregationJob extends MantisJobProvider<LogAggregate> {
private Sink<LogAggregate> sink = Sinks.eagerSubscribe(Sinks.sse(LogAggregate::toJsonString));
@Override
public Job<LogAggregate> getJobInstance() {
return MantisJob
.source(new RandomLogSource())
.stage(new TransformLogStage(), TransformLogStage.stageConfig())
.stage(new GroupLogStage(), GroupLogStage.config())
.stage(new CountLogStage(), CountLogStage.config())
.sink(sink)
.metadata(new Metadata.Builder().build())
.create();
}
}

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netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/job/LogCollectingJob.java Normal file
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package com.baeldung.netflix.mantis.job;
import com.baeldung.netflix.mantis.model.LogEvent;
import com.baeldung.netflix.mantis.sink.LogSink;
import com.baeldung.netflix.mantis.source.RandomLogSource;
import com.baeldung.netflix.mantis.stage.TransformLogStage;
import io.mantisrx.runtime.Job;
import io.mantisrx.runtime.MantisJob;
import io.mantisrx.runtime.MantisJobProvider;
import io.mantisrx.runtime.Metadata;
import io.mantisrx.runtime.ScalarToScalar;
import io.mantisrx.runtime.sink.Sink;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
@NoArgsConstructor
@AllArgsConstructor
public class LogCollectingJob extends MantisJobProvider<LogEvent> {
private Sink<LogEvent> sink = new LogSink();
@Override
public Job<LogEvent> getJobInstance() {
return MantisJob
.source(new RandomLogSource())
.stage(new TransformLogStage(), new ScalarToScalar.Config<>())
.sink(sink)
.metadata(new Metadata.Builder().build())
.create();
}
}

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netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/model/LogAggregate.java Normal file
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package com.baeldung.netflix.mantis.model;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.mantisrx.runtime.codec.JsonType;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
@Getter
@NoArgsConstructor
@AllArgsConstructor
public class LogAggregate implements JsonType {
private static final ObjectMapper mapper = new ObjectMapper();
private Integer count;
private String level;
public String toJsonString() {
try {
return mapper.writeValueAsString(this);
} catch (JsonProcessingException e) {
return null;
}
}
}

35
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/model/LogEvent.java Normal file
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package com.baeldung.netflix.mantis.model;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.mantisrx.runtime.codec.JsonType;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Getter
@Setter
@NoArgsConstructor
public class LogEvent implements JsonType {
private static final ObjectMapper mapper = new ObjectMapper();
private Long index;
private String level;
private String message;
public LogEvent(String[] parts) {
this.index = Long.valueOf(parts[0]);
this.level = parts[1];
this.message = parts[2];
}
public String toJsonString() {
try {
return mapper.writeValueAsString(this);
} catch (JsonProcessingException e) {
return null;
}
}
}

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netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/sink/LogSink.java Normal file
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package com.baeldung.netflix.mantis.sink;
import com.baeldung.netflix.mantis.model.LogEvent;
import io.mantisrx.runtime.Context;
import io.mantisrx.runtime.PortRequest;
import io.mantisrx.runtime.sink.SelfDocumentingSink;
import io.mantisrx.runtime.sink.ServerSentEventsSink;
import io.mantisrx.runtime.sink.Sink;
import io.mantisrx.runtime.sink.predicate.Predicate;
import rx.Observable;
public class LogSink implements Sink<LogEvent> {
@Override
public void call(Context context, PortRequest portRequest, Observable<LogEvent> logEventObservable) {
SelfDocumentingSink<LogEvent> sink = new ServerSentEventsSink.Builder<LogEvent>()
.withEncoder(LogEvent::toJsonString)
.withPredicate(filterByLogMessage())
.build();
logEventObservable.subscribe();
sink.call(context, portRequest, logEventObservable);
}
private Predicate<LogEvent> filterByLogMessage() {
return new Predicate<>("filter by message",
parameters -> {
if (parameters != null && parameters.containsKey("filter")) {
return logEvent -> logEvent.getMessage().contains(parameters.get("filter").get(0));
}
return logEvent -> true;
});
}
}

46
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/source/RandomLogSource.java Normal file
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package com.baeldung.netflix.mantis.source;
import io.mantisrx.runtime.Context;
import io.mantisrx.runtime.source.Index;
import io.mantisrx.runtime.source.Source;
import lombok.extern.slf4j.Slf4j;
import net.andreinc.mockneat.MockNeat;
import rx.Observable;
import java.util.Date;
import java.util.concurrent.TimeUnit;
@Slf4j
public class RandomLogSource implements Source<String> {
private MockNeat mockDataGenerator;
@Override
public void init(Context context, Index index) {
mockDataGenerator = MockNeat.threadLocal();
}
@Override
public Observable<Observable<String>> call(Context context, Index index) {
return Observable.just(
Observable
.interval(250, TimeUnit.MILLISECONDS)
.map(this::createRandomLogEvent));
}
private String createRandomLogEvent(Long tick) {
String level = mockDataGenerator.probabilites(String.class)
.add(0.5, "INFO")
.add(0.3, "WARN")
.add(0.2, "ERROR")
.get();
String message = mockDataGenerator.probabilites(String.class)
.add(0.5, "login attempt")
.add(0.5, "user created")
.get();
return tick + "#" + level + "#" + message;
}
}

58
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/stage/CountLogStage.java Normal file
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package com.baeldung.netflix.mantis.stage;
import com.baeldung.netflix.mantis.model.LogAggregate;
import com.baeldung.netflix.mantis.model.LogEvent;
import io.mantisrx.common.MantisGroup;
import io.mantisrx.runtime.Context;
import io.mantisrx.runtime.GroupToScalar;
import io.mantisrx.runtime.codec.JacksonCodecs;
import io.mantisrx.runtime.computation.GroupToScalarComputation;
import io.mantisrx.runtime.parameter.ParameterDefinition;
import io.mantisrx.runtime.parameter.type.IntParameter;
import io.mantisrx.runtime.parameter.validator.Validators;
import rx.Observable;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
public class CountLogStage implements GroupToScalarComputation<String, LogEvent, LogAggregate> {
private int duration;
@Override
public void init(Context context) {
duration = (int)context.getParameters().get("LogAggregationDuration", 1000);
}
@Override
public Observable<LogAggregate> call(Context context, Observable<MantisGroup<String, LogEvent>> mantisGroup) {
return mantisGroup
.window(duration, TimeUnit.MILLISECONDS)
.flatMap(o -> o.groupBy(MantisGroup::getKeyValue)
.flatMap(group -> group.reduce(0, (count, value) -> count = count + 1)
.map((count) -> new LogAggregate(count, group.getKey()))
));
}
public static GroupToScalar.Config<String, LogEvent, LogAggregate> config(){
return new GroupToScalar.Config<String, LogEvent, LogAggregate>()
.description("sum events for a log level")
.codec(JacksonCodecs.pojo(LogAggregate.class))
.withParameters(getParameters());
}
public static List<ParameterDefinition<?>> getParameters() {
List<ParameterDefinition<?>> params = new ArrayList<>();
params.add(new IntParameter()
.name("LogAggregationDuration")
.description("window size for aggregation in milliseconds")
.validator(Validators.range(100, 10000))
.defaultValue(5000)
.build()) ;
return params;
}
}

25
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/stage/GroupLogStage.java Normal file
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package com.baeldung.netflix.mantis.stage;
import com.baeldung.netflix.mantis.model.LogEvent;
import io.mantisrx.common.MantisGroup;
import io.mantisrx.runtime.Context;
import io.mantisrx.runtime.ScalarToGroup;
import io.mantisrx.runtime.codec.JacksonCodecs;
import io.mantisrx.runtime.computation.ToGroupComputation;
import rx.Observable;
public class GroupLogStage implements ToGroupComputation<LogEvent, String, LogEvent> {
@Override
public Observable<MantisGroup<String, LogEvent>> call(Context context, Observable<LogEvent> logEvent) {
return logEvent.map(log -> new MantisGroup<>(log.getLevel(), log));
}
public static ScalarToGroup.Config<LogEvent, String, LogEvent> config(){
return new ScalarToGroup.Config<LogEvent, String, LogEvent>()
.description("Group event data by level")
.codec(JacksonCodecs.pojo(LogEvent.class))
.concurrentInput();
}
}

24
netflix-modules/mantis/src/main/java/com/baeldung/netflix/mantis/stage/TransformLogStage.java Normal file
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package com.baeldung.netflix.mantis.stage;
import com.baeldung.netflix.mantis.model.LogEvent;
import io.mantisrx.runtime.Context;
import io.mantisrx.runtime.ScalarToScalar;
import io.mantisrx.runtime.codec.JacksonCodecs;
import io.mantisrx.runtime.computation.ScalarComputation;
import rx.Observable;
public class TransformLogStage implements ScalarComputation<String, LogEvent> {
@Override
public Observable<LogEvent> call(Context context, Observable<String> logEntry) {
return logEntry
.map(log -> log.split("#"))
.filter(parts -> parts.length == 3)
.map(LogEvent::new);
}
public static ScalarToScalar.Config<String, LogEvent> stageConfig() {
return new ScalarToScalar.Config<String, LogEvent>()
.codec(JacksonCodecs.pojo(LogEvent.class));
}
}

56
netflix-modules/mantis/src/test/java/com/baeldung/netflix/mantis/job/LogAggregationJobIntegrationTest.java Normal file
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package com.baeldung.netflix.mantis.job;
import com.baeldung.netflix.mantis.model.LogAggregate;
import io.mantisrx.runtime.PortRequest;
import io.mantisrx.runtime.sink.Sinks;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import static java.util.Arrays.asList;
import static java.util.Optional.of;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
class LogAggregationJobIntegrationTest extends MantisJobTestBase<LogAggregate> {
private final static int PORT = 7382;
private final static String SINK_URL = "http://localhost:" + PORT;
@BeforeAll
static void beforeAll() {
start(new LogAggregationJob((context, portRequest, logAggregateObservable) -> {
logAggregateObservable.subscribe();
Sinks.sse(LogAggregate::toJsonString).call(context, new PortRequest(PORT), logAggregateObservable);
}));
}
@Override
public String getSinkUrl() {
return SINK_URL;
}
@Override
public Class<LogAggregate> getEventType() {
return LogAggregate.class;
}
@Test
void whenReadingFromSink_thenShouldRetrieveCorrectNumberOfLogAggregates() {
assertEquals(of(5L), sinkStream.take(5).count().blockOptional());
}
@Test
void whenReadingFromSink_thenShouldRetrieveLogAggregate() {
assertNotNull(sinkStream.take(1).blockFirst());
}
@Test
void whenReadingFromSink_thenShouldRetrieveValidLogAggregate() {
LogAggregate logAggregate = sinkStream.take(1).blockFirst();
assertTrue(asList("ERROR", "WARN", "INFO").contains(logAggregate.getLevel()));
assertTrue(logAggregate.getCount() > 0);
}
}

73
netflix-modules/mantis/src/test/java/com/baeldung/netflix/mantis/job/LogCollectingJobIntegrationTest.java Normal file
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package com.baeldung.netflix.mantis.job;
import com.baeldung.netflix.mantis.model.LogEvent;
import com.baeldung.netflix.mantis.sink.LogSink;
import io.mantisrx.runtime.Context;
import io.mantisrx.runtime.PortRequest;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import rx.Observable;
import static java.util.Arrays.asList;
import static java.util.Optional.of;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
class LogCollectingJobIntegrationTest extends MantisJobTestBase<LogEvent> {
private final static int PORT = 7381;
private final static String SINK_URL = "http://localhost:" + PORT;
@BeforeAll
static void beforeAll() {
start(new LogCollectingJob(new LogSink() {
@Override
public void call(Context context, PortRequest portRequest, Observable<LogEvent> observable) {
super.call(context, new PortRequest(PORT), observable);
}
}));
}
@Override
public String getSinkUrl() {
return SINK_URL;
}
@Override
public Class<LogEvent> getEventType() {
return LogEvent.class;
}
@Test
void whenReadingFromSink_thenShouldRetrieveCorrectNumberOfLogEvents() {
assertEquals(of(5L), sinkStream.take(5).count().blockOptional());
}
@Test
void whenReadingFromSink_thenShouldRetrieveLogEvent() {
assertNotNull(sinkStream.take(1).blockFirst());
}
@Test
void whenReadingFromSink_thenShouldRetrieveValidLogEvent() {
LogEvent logEvent = sinkStream.take(1).blockFirst();
assertTrue(asList("ERROR", "WARN", "INFO").contains(logEvent.getLevel()));
assertTrue(asList("login attempt", "user created").contains(logEvent.getMessage()));
}
@Test
void whenReadingFromSink_thenShouldRetrieveFilteredLogEvents() {
getSinkStream(SINK_URL + "?filter=login")
.take(7)
.toStream().forEach(
logEvent -> assertEquals("login attempt", logEvent.getMessage())
);
}
}

49
netflix-modules/mantis/src/test/java/com/baeldung/netflix/mantis/job/MantisJobTestBase.java Normal file
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package com.baeldung.netflix.mantis.job;
import io.mantisrx.runtime.Job;
import io.mantisrx.runtime.MantisJobProvider;
import io.mantisrx.runtime.executor.LocalJobExecutorNetworked;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeEach;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Flux;
import reactor.util.retry.Retry;
import java.time.Duration;
public abstract class MantisJobTestBase<T> {
private static Job jobInstance;
Flux<T> sinkStream;
public abstract String getSinkUrl();
public abstract Class<T> getEventType();
@BeforeEach
void setUp() {
sinkStream = getSinkStream(getSinkUrl());
}
@AfterAll
static void afterAll() {
stopJob();
}
protected Flux<T> getSinkStream(String sinkUrl) {
return WebClient.builder().build().get()
.uri(sinkUrl)
.retrieve()
.bodyToFlux(getEventType())
.retryWhen(Retry.fixedDelay(10, Duration.ofMillis(2000)));
}
static <T> void start(MantisJobProvider<T> job) {
jobInstance = job.getJobInstance();
new Thread(() -> LocalJobExecutorNetworked.execute(jobInstance)).start();
}
static void stopJob() {
jobInstance.getLifecycle().shutdown();
}
}

1
netflix-modules/pom.xml
View File

@ -15,6 +15,7 @@
<modules>
<module>genie</module>
<module>mantis</module>
</modules>
</project>