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The taskana rest logic.
There is a newer version: 8.2.0
package pro.taskana.rest;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.SpringHandlerInstantiator;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import com.fasterxml.jackson.databind.cfg.HandlerInstantiator;

import pro.taskana.ClassificationService;
import pro.taskana.TaskMonitorService;
import pro.taskana.TaskService;
import pro.taskana.TaskanaEngine;
import pro.taskana.WorkbasketService;
import pro.taskana.configuration.SpringTaskanaEngineConfiguration;
import pro.taskana.configuration.TaskanaEngineConfiguration;

/**
 * Configuration for REST service.
 */
@Configuration
@ComponentScan
@EnableTransactionManagement
public class RestConfiguration {

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "datasource")
    public DataSourceProperties dataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    @Primary
    public DataSource dataSource(DataSourceProperties properties) {
        return properties.initializeDataSourceBuilder().build();
    }

    @Bean
    public ClassificationService getClassificationService(TaskanaEngine taskanaEngine) {
        return taskanaEngine.getClassificationService();
    }

    @Bean
    public TaskService getTaskService(TaskanaEngine taskanaEngine) {
        return taskanaEngine.getTaskService();
    }

    @Bean
    public TaskMonitorService getTaskMonitorService(TaskanaEngine taskanaEngine) {
        return taskanaEngine.getTaskMonitorService();
    }

    @Bean
    public WorkbasketService getWorkbasketService(TaskanaEngine taskanaEngine) {
        return taskanaEngine.getWorkbasketService();
    }

    @Bean
    @Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)
    public TaskanaEngine getTaskanaEngine(TaskanaEngineConfiguration taskanaEngineConfiguration) {
        return taskanaEngineConfiguration.buildTaskanaEngine();
    }

    @Bean
    @Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)
    public TaskanaEngineConfiguration taskanaEngineConfiguration(DataSource dataSource) throws SQLException {
        return new SpringTaskanaEngineConfiguration(dataSource, true, true);
    }

    // Needed to override JSON De-/Serializer in Jackson.
    @Bean
    public Jackson2ObjectMapperBuilder jacksonBuilder(HandlerInstantiator handlerInstantiator) {
        Jackson2ObjectMapperBuilder b = new Jackson2ObjectMapperBuilder();
        b.indentOutput(true);
        b.handlerInstantiator(handlerInstantiator);
        return b;
    }

    //Needed for injection into jackson deserilizer.
    @Bean
    public HandlerInstantiator handlerInstantiator(ApplicationContext context) {
        return new SpringHandlerInstantiator(context.getAutowireCapableBeanFactory());
    }

    @Bean
    public PlatformTransactionManager txManager(DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}