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Juraj Veverka
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mongodb example created
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‎mongodb-demo/.gitignore

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.gradle
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.settings
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bin
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out
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build
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.classpath
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.project
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.idea
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*.iml
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‎mongodb-demo/README.md

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# MongoDB demo
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Simple MongoDB 4.0.1 / Java demo
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### Quick install MongoDB on localhost
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Download MongoDB binary from [here](https://www.mongodb.com/download-center#community).
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Java documentation is [here](http://mongodb.github.io/mongo-java-driver/3.6/).
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- unpack mongo tar package
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```tar xzvf mongodb-linux-x86_64-4.0.1.tgz```
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- make database directory
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```mkdir -p mongodb-linux-x86_64-4.0.1/data/db```
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- run mongodb server
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```
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cd mongodb-linux-x86_64-4.0.1/bin
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./mongod --dbpath ../data/db
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```
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- create database and user
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```
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cd mongodb-linux-x86_64-4.0.1/bin
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./mongo
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use testdb
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db.createUser({user: "testuser", pwd: "secret", roles: [ "readWrite", "dbAdmin" ]})
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```
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- setup is complete. next time start mongodb with command
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```./mongod --dbpath ../data/db```
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### Build and run
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Just run Main in the project or see unit tests. Database server has to be started first.
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```
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gradle clean build distZip
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```
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### Start integration tests
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1. Start mongo DB in new terminal window.
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```
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./mongod --dbpath ../data/db
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```
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2. Start integration tests.
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```
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gradle clean test -Dtest.profile=integration
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```
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### Useful mongodb queries
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```
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cd mongodb-linux-x86_64-4.0.1/bin
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./mongo
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use testdb
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db.roles.find()
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db.roles.insert({"_id": "1", "description": "aaa" })
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db.roles.remove({ "_id": "1" }, { justOne: true})
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db.roles.drop()
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```

‎mongodb-demo/build.gradle

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apply plugin: 'java'
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apply plugin: 'application'
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sourceCompatibility = 10
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targetCompatibility = 10
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mainClassName = 'itx.examples.mongodb.Main'
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repositories {
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mavenCentral()
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}
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dependencies {
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compile 'org.mongodb:mongodb-driver:3.8.1'
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compile 'org.slf4j:slf4j-api:1.8.0-beta2'
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compile 'org.slf4j:slf4j-simple:1.8.0-beta2'
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testCompile 'org.testng:testng:6.14.3'
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}
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test {
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useTestNG()
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//testLogging.showStandardStreams = true
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testLogging {
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events "passed", "skipped", "failed"
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}
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if (System.properties['test.profile'] != 'integration') {
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exclude '**/*ITTest*'
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}
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}
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‎mongodb-demo/src/main/java/itx/examples/mongodb/Main.java

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package itx.examples.mongodb;
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import com.mongodb.MongoClient;
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import com.mongodb.MongoClientOptions;
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import com.mongodb.client.MongoDatabase;
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import itx.examples.mongodb.dto.Role;
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import itx.examples.mongodb.services.RoleService;
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import itx.examples.mongodb.services.RoleServiceImpl;
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import org.bson.codecs.configuration.CodecRegistry;
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import org.bson.codecs.pojo.PojoCodecProvider;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Collection;
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import static org.bson.codecs.configuration.CodecRegistries.fromProviders;
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import static org.bson.codecs.configuration.CodecRegistries.fromRegistries;
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public class Main {
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final private static Logger LOG = LoggerFactory.getLogger(Main.class);
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public static void main(String[] args ) {
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LOG.info("MongoDB demo starting ...");
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CodecRegistry pojoCodecRegistry = fromRegistries(MongoClient.getDefaultCodecRegistry(),
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fromProviders(PojoCodecProvider.builder().automatic(true).build()));
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MongoClient mongoClient = new MongoClient( Utils.SERVER_HOSTNAME, MongoClientOptions.builder().codecRegistry(pojoCodecRegistry).build());
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MongoDatabase database = mongoClient.getDatabase(Utils.DB_NAME);
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RoleService roleService = new RoleServiceImpl(database);
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Collection<Role> roles = roleService.getRoles();
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LOG.info("Roles: {}", roles.size());
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LOG.info("MongoDB demo done.");
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}
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}

‎mongodb-demo/src/main/java/itx/examples/mongodb/Utils.java

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package itx.examples.mongodb;
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public final class Utils {
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private Utils() {
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throw new UnsupportedOperationException("Do not instantiate utility class.");
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}
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public static final String SERVER_HOSTNAME = "localhost";
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public static final String DB_NAME = "testdb";
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public static final String ROLES_COLLECTION_NAME = "roles";
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}

‎mongodb-demo/src/main/java/itx/examples/mongodb/dto/Role.java

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package itx.examples.mongodb.dto;
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public class Role {
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private String id;
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private String description;
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public Role() {
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}
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public Role(String id, String description) {
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this.id = id;
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this.description = description;
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}
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public String getId() {
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return id;
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}
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public String getDescription() {
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return description;
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}
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public void setId(String id) {
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this.id = id;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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}

‎mongodb-demo/src/main/java/itx/examples/mongodb/services/DataException.java

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package itx.examples.mongodb.services;
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public class DataException extends Exception {
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public DataException() {
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}
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public DataException(String message) {
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super(message);
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}
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public DataException(String message, Throwable cause) {
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super(message, cause);
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}
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public DataException(Throwable cause) {
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super(cause);
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}
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}

‎mongodb-demo/src/main/java/itx/examples/mongodb/services/RoleService.java

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package itx.examples.mongodb.services;
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import itx.examples.mongodb.dto.Role;
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import java.util.Collection;
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public interface RoleService {
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Collection<Role> getRoles();
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void insertRole(Role role) throws DataException;
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void removeRole(String id) throws DataException;
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void removeAll() throws DataException;
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}

‎mongodb-demo/src/main/java/itx/examples/mongodb/services/RoleServiceImpl.java

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package itx.examples.mongodb.services;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoCursor;
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import com.mongodb.client.MongoDatabase;
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import com.mongodb.client.result.DeleteResult;
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import itx.examples.mongodb.Utils;
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import itx.examples.mongodb.dto.Role;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.ArrayList;
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import java.util.Collection;
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import static com.mongodb.client.model.Filters.eq;
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public class RoleServiceImpl implements RoleService {
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final private static Logger LOG = LoggerFactory.getLogger(RoleServiceImpl.class);
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private MongoDatabase database;
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public RoleServiceImpl(MongoDatabase database) {
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this.database = database;
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}
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@Override
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public Collection<Role> getRoles() {
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LOG.info("getRoles");
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MongoCollection<Role> collection = database.getCollection(Utils.ROLES_COLLECTION_NAME, Role.class);
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Collection<Role> roles = new ArrayList<>();
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MongoCursor<Role> rolesIterator = collection.find().iterator();
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while (rolesIterator.hasNext()) {
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roles.add(rolesIterator.next());
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}
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return roles;
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}
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@Override
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public void insertRole(Role role) throws DataException {
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LOG.info("insert role: {} {}", role.getId(), role.getDescription());
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MongoCollection<Role> collection = database.getCollection(Utils.ROLES_COLLECTION_NAME, Role.class);
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collection.insertOne(role);
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}
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@Override
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public void removeRole(String id) throws DataException {
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LOG.info("remove role: {}", id);
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MongoCollection<Role> collection = database.getCollection(Utils.ROLES_COLLECTION_NAME, Role.class);
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DeleteResult deleteResult = collection.deleteOne(eq("_id", id));
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LOG.info("deleted {}", deleteResult.getDeletedCount());
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}
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@Override
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public void removeAll() throws DataException {
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LOG.info("remove all");
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MongoCollection<Role> collection = database.getCollection(Utils.ROLES_COLLECTION_NAME, Role.class);
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collection.drop();
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}
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}

‎mongodb-demo/src/main/resources/log4j.properties

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log4j.rootLogger=INFO, STDOUT
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log4j.logger.deng=INFO
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log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
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log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
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log4j.appender.STDOUT.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

‎mongodb-demo/src/test/java/itx/examples/mongodb/RoleServiceITTest.java

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package itx.examples.mongodb;
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import com.mongodb.MongoClient;
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import com.mongodb.MongoClientOptions;
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import com.mongodb.client.MongoDatabase;
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import itx.examples.mongodb.dto.Role;
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import itx.examples.mongodb.services.DataException;
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import itx.examples.mongodb.services.RoleService;
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import itx.examples.mongodb.services.RoleServiceImpl;
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import org.bson.codecs.configuration.CodecRegistry;
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import org.bson.codecs.pojo.PojoCodecProvider;
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import org.testng.Assert;
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import org.testng.annotations.AfterClass;
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import org.testng.annotations.BeforeClass;
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import org.testng.annotations.Test;
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import java.util.Collection;
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import static org.bson.codecs.configuration.CodecRegistries.fromProviders;
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import static org.bson.codecs.configuration.CodecRegistries.fromRegistries;
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public class RoleServiceITTest {
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private MongoClient mongoClient;
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private MongoDatabase database;
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private RoleService roleService;
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@BeforeClass
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public void init() throws DataException {
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CodecRegistry pojoCodecRegistry = fromRegistries(MongoClient.getDefaultCodecRegistry(),
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fromProviders(PojoCodecProvider.builder().automatic(true).build()));
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mongoClient = new MongoClient( Utils.SERVER_HOSTNAME, MongoClientOptions.builder().codecRegistry(pojoCodecRegistry).build());
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database = mongoClient.getDatabase(Utils.DB_NAME);
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roleService = new RoleServiceImpl(database);
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roleService.removeAll();
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}
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@Test
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public void testRolesService() throws DataException {
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Collection<Role> roles = roleService.getRoles();
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Assert.assertNotNull(roles);
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Assert.assertTrue(roles.isEmpty());
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roleService.insertRole(new Role("1", "aaa"));
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roles = roleService.getRoles();
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Assert.assertNotNull(roles);
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Assert.assertTrue(roles.size() == 1);
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roleService.insertRole(new Role("2", "bbb"));
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roles = roleService.getRoles();
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Assert.assertNotNull(roles);
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Assert.assertTrue(roles.size() == 2);
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roleService.removeRole("1");
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roles = roleService.getRoles();
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Assert.assertNotNull(roles);
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Assert.assertTrue(roles.size() == 1);
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roleService.removeRole("2");
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roles = roleService.getRoles();
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Assert.assertNotNull(roles);
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Assert.assertTrue(roles.isEmpty());
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}
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@AfterClass
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public void destroy() {
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try {
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roleService.removeAll();
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} catch (DataException e) {
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e.printStackTrace();
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}
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mongoClient.close();
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}
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}

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