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Примеры по аннотациям, сериализации и многопоточности
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‎.gitignore‎

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.idea
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*.iml

‎README.md‎

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# fizteh-java-2015-ext
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Для запуска примеров в IDE нужно включить поддержку обработчиков аннотаций
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> для IntelliJ IDEA: File | Settings | Build, Execution, Deployment | Compiler | Annotation Processors |
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флаг Enable annotation processing)
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## Ссылки на примеры
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* Репозиторий проекта: https://github.com/schebotarev/fizteh-java-2015-ext
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* Использование аннотаций для конфигурирования библиотеки: http://jcommander.org/
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* Приложение визуальной демонстрации возможностей многопоточности в Java:
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http://sourceforge.net/projects/javaconcurrenta/

‎samples/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>ru.mipt.diht.samples</groupId>
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<artifactId>fizteh-java-2015-ext</artifactId>
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<packaging>jar</packaging>
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<version>1.0</version>
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<name>fizteh-java-2015-ext</name>
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<url>https://github.com/schebotarev/fizteh-java-2015-ext</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<jackson_lib_ver>2.1.4</jackson_lib_ver>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.3</version>
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<!--<configuration>-->
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<!--<compilerVersion>1.8</compilerVersion>-->
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<!--<source>1.8</source>-->
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<!--<target>1.8</target>-->
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<!--</configuration>-->
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!-- Common -->
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.16.6</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-simple</artifactId>
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<version>1.7.12</version>
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</dependency>
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<!-- Serialization -->
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>${jackson_lib_ver}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson_lib_ver}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-annotations</artifactId>
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<version>${jackson_lib_ver}</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.8.1</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎samples/src/main/java/ru/mipt/diht/samples/model/Car.java‎

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package ru.mipt.diht.samples.model;
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import lombok.Data;
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import javax.xml.bind.annotation.XmlRootElement;
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import java.util.Date;
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/**
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* @author s.chebotarev
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* @since 05.11.2015
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*/
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@XmlRootElement
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@Data
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public class Car {
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private String id;
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private String model;
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private Date dateOfManufacture;
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private int priceRur;
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}

‎samples/src/main/java/ru/mipt/diht/samples/serialization/json/JsonSerializer.java‎

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package ru.mipt.diht.samples.serialization.json;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import java.io.IOException;
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/**
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* @author s.chebotarev
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* @since 05.11.2015
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*/
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public class JsonSerializer {
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private final ObjectMapper mapper;
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public JsonSerializer() {
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mapper = new ObjectMapper();
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}
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public String toJson(Object object) {
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try {
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return mapper.writeValueAsString(object);
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} catch (JsonProcessingException e) {
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throw new RuntimeException("failed to create json from: " + object, e);
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}
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}
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public <T> T fromJson(String json, Class<T> type) {
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try {
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return mapper.readValue(json, type);
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} catch (IOException e) {
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throw new RuntimeException("failed to read object from json: " + json, e);
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}
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}
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}

‎samples/src/main/java/ru/mipt/diht/samples/serialization/xml/XmlSerializer.java‎

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package ru.mipt.diht.samples.serialization.xml;
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import lombok.SneakyThrows;
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import javax.xml.bind.JAXBContext;
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import javax.xml.bind.Marshaller;
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import javax.xml.bind.Unmarshaller;
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import java.io.StringReader;
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import java.io.StringWriter;
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/**
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* @author s.chebotarev
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* @since 05.11.2015
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*/
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public class XmlSerializer {
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@SneakyThrows
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public String toXml(Object object) {
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JAXBContext context = JAXBContext.newInstance(object.getClass());
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Marshaller marshaller = context.createMarshaller();
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StringWriter writer = new StringWriter();
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marshaller.marshal(object, writer);
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return writer.toString();
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}
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@SneakyThrows
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public <T> T fromXml(String xml, Class<T> type) {
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JAXBContext context = JAXBContext.newInstance(type);
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Unmarshaller unmarshaller = context.createUnmarshaller();
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Object result = unmarshaller.unmarshal(new StringReader(xml));
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return type.cast(result);
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}
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}

‎samples/src/main/java/ru/mipt/diht/samples/utils/Utils.java‎

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package ru.mipt.diht.samples.utils;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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/**
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* @author s.chebotarev
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* @since 05.11.2015
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*/
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public class Utils {
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/*
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* Возвращает объект Date с указанной в формате "yyyy.MM.dd" датой.
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**/
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public static Date parseDate(String dateStr) {
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try {
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return new SimpleDateFormat("yyyy.MM.dd").parse(dateStr);
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} catch (ParseException e) {
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throw new RuntimeException("illegal date: " + dateStr, e);
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}
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}
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}

‎samples/src/main/resources/sample.json‎

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{
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"id": "id5342",
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"model": "IBM 2101",
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"dateOfManufacture": 348872400000,
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"priceRur": 0
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}

‎samples/src/main/resources/sample.xml‎

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<?xmlversion= "1.0" encoding= "UTF-8" ?>
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<root xmlns:fivt="http://fivt.fizteh.ru/common">
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<element attribute="attributevalue&quot; ">
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text
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<!--comment-->
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<![CDATA[
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<escaped_text/>
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<![CDATA[
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<escaped_text/>
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]] >
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<!-- no escape for "]] >" w/o space -->
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]]>
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</element>
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<fivt:element/>
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</root>

‎samples/src/test/java/ru/mipt/diht/samples/reflection/SimpleReflectionTest.java‎

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package ru.mipt.diht.samples.reflection;
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import lombok.extern.slf4j.Slf4j;
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import org.junit.Test;
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import ru.mipt.diht.samples.model.Car;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Collection;
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import static org.junit.Assert.*;
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/**
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* @author s.chebotarev
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* @since 05.11.2015
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*/
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@Slf4j
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public class SimpleReflectionTest {
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@SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
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private Collection<Car> carsHolder = new ArrayList<>();
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@Test
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public void testGeneratedMethods() throws Exception {
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Class<?> enrichedType = Car.class;
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Method[] methods = enrichedType.getDeclaredMethods();
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for (Method method : methods) {
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log.info("{}({}): {}", method.getName(), method.getParameterTypes(), method.getReturnType().getSimpleName());
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}
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assertTrue("there are generated methods", methods.length > 0);
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}
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@Test
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public void testFields() {
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Field[] fields = Car.class.getDeclaredFields();
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for (Field field : fields) {
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log.info("{}: {}", field.getName(), field.getType().getSimpleName());
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}
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assertTrue("there are some fields", fields.length > 0);
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}
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@Test
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public void testConstuctors() {
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Constructor[] constructors = Car.class.getDeclaredConstructors();
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for (Constructor constructor : constructors) {
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log.info("{}", constructor);
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}
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assertTrue("there are some constructors", constructors.length > 0);
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}
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@Test
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public void testDynamicObjectClass() {
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Object obj = new Car();
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assertEquals("car class", Car.class, obj.getClass());
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assertSame("car class", Car.class, obj.getClass());
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assertEquals("string class", String.class, "123".getClass());
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assertSame("string class", String.class, "123".getClass());
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}
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@Test
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public void testParentClasses() {
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Class type = Car.class;
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Class parent = type.getSuperclass();
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assertNotNull("Car.super", parent);
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log.info("inspecting Car.class superclasses");
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for (; type != null; type = type.getSuperclass()) {
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log.info("=> {}", type.getSimpleName());
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}
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log.info("inspecting Class.class superclasses");
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type = Class.class;
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for (; type != null; type = type.getSuperclass()) {
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log.info("=> {}", type.getSimpleName());
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}
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}
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@Test
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public void testGenericsInfo() throws Exception {
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log.info("{}", getClass().getDeclaredField("carsHolder").getGenericType());
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log.info("{}", carsHolder.getClass().getTypeParameters());
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}
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@Test
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public void testPublicAccess() throws Exception {
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Car car = new Car();
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car.setId("id123");
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Object res = Car.class.getMethod("getId").invoke(car);
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log.info("call res: {}", res);
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}
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@Test(expected = IllegalAccessException.class)
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public void testIllegalPrivateAccess() throws Exception {
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Car car = new Car();
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car.setId("id123");
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Object res = Car.class.getDeclaredField("id").get(car);
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log.info("field access res: {}", res);
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}
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@Test
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public void testSetAccessible() throws Exception {
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Car car = new Car();
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car.setId("id123");
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Field field = Car.class.getDeclaredField("id");
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field.setAccessible(true); // only for this instance
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Object res = field.get(car);
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log.info("field access res: {}", res);
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}
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@Test
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public void testConstructor() throws Exception {
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Car car1 = new Car();
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Car car2 = Car.class.newInstance();
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assertNotNull(car2);
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assertEquals(car1, car2);
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assertNotSame(car1, car2);
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}
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@Test
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public void testAnnotation() throws Exception {
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Test annotation = getClass().getMethod("testIllegalPrivateAccess").getAnnotation(Test.class);
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assertNotNull(annotation);
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assertEquals("expected exception", IllegalAccessException.class, annotation.expected());
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assertEquals("timeout", 0, annotation.timeout());
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assertEquals("timeout", 0L, annotation.annotationType().getMethod("timeout").getDefaultValue());
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}
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@Test
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public void testClassForName() throws Exception {
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assertEquals("Car class found by name", Car.class, Class.forName("ru.mipt.diht.samples.model.Car"));
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}
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}

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