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amit2103
2019-09-27 01:07:06 +05:30
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2
spring-boot-environment/README.md Normal file
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### Relevant Articles:
- [EnvironmentPostProcessor in Spring Boot](https://www.baeldung.com/spring-boot-environmentpostprocessor)

148
spring-boot-environment/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>spring-boot-environment</artifactId>
<name>spring-boot-environment</name>
<packaging>war</packaging>
<description>Demo project for Spring Boot</description>
<parent>
<artifactId>parent-boot-2</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-boot-2</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>${jpa.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.subethamail</groupId>
<artifactId>subethasmtp</artifactId>
<version>${subethasmtp.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
<version>${springcloud.version}</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>${httpclient.version}</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
<excludes>
<exclude>**/conf.properties</exclude>
</excludes>
</resource>
</resources>
</build>
<profiles>
<profile>
<id>autoconfiguration</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<executions>
<execution>
<phase>integration-test</phase>
<goals>
<goal>test</goal>
</goals>
<configuration>
<excludes>
<exclude>**/*LiveTest.java</exclude>
<exclude>**/*IntegrationTest.java</exclude>
<exclude>**/*IntTest.java</exclude>
</excludes>
<includes>
<include>**/AutoconfigurationTest.java</include>
</includes>
</configuration>
</execution>
</executions>
<configuration>
<systemPropertyVariables>
<test.mime>json</test.mime>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<properties>
<jpa.version>2.2</jpa.version>
<guava.version>18.0</guava.version>
<subethasmtp.version>3.1.7</subethasmtp.version>
<springcloud.version>2.0.2.RELEASE</springcloud.version>
<httpclient.version>4.5.8</httpclient.version>
</properties>
</project>

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/PriceCalculationApplication.java Normal file
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package com.baeldung.environmentpostprocessor;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.baeldung.environmentpostprocessor.service.PriceCalculationService;
@SpringBootApplication
public class PriceCalculationApplication implements CommandLineRunner {
@Autowired
PriceCalculationService priceCalculationService;
private static final Logger logger = LoggerFactory.getLogger(PriceCalculationApplication.class);
public static void main(String[] args) {
SpringApplication.run(PriceCalculationApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
List<String> params = Arrays.stream(args)
.collect(Collectors.toList());
if (verifyArguments(params)) {
double singlePrice = Double.valueOf(params.get(0));
int quantity = Integer.valueOf(params.get(1));
priceCalculationService.productTotalPrice(singlePrice, quantity);
} else {
logger.warn("Invalid arguments " + params.toString());
}
}
private boolean verifyArguments(List<String> args) {
boolean successful = true;
if (args.size() != 2) {
successful = false;
return successful;
}
try {
double singlePrice = Double.valueOf(args.get(0));
int quantity = Integer.valueOf(args.get(1));
} catch (NumberFormatException e) {
successful = false;
}
return successful;
}
}

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/PriceCalculationEnvironmentPostProcessor.java Normal file
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package com.baeldung.environmentpostprocessor;
import static org.springframework.core.env.StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.PropertySource;
@Order(Ordered.LOWEST_PRECEDENCE)
public class PriceCalculationEnvironmentPostProcessor implements EnvironmentPostProcessor {
private static final Logger logger = LoggerFactory.getLogger(PriceCalculationEnvironmentPostProcessor.class);
private static final String PREFIX = "com.baeldung.environmentpostprocessor.";
private static final String CALCUATION_MODE = "calculation_mode";
private static final String GROSS_CALCULATION_TAX_RATE = "gross_calculation_tax_rate";
private static final String CALCUATION_MODE_DEFAULT_VALUE = "NET";
private static final double GROSS_CALCULATION_TAX_RATE_DEFAULT_VALUE = 0;
List<String> names = Arrays.asList(CALCUATION_MODE, GROSS_CALCULATION_TAX_RATE);
private static Map<String, Object> defaults = new LinkedHashMap<>();
static {
defaults.put(CALCUATION_MODE, CALCUATION_MODE_DEFAULT_VALUE);
defaults.put(GROSS_CALCULATION_TAX_RATE, GROSS_CALCULATION_TAX_RATE_DEFAULT_VALUE);
}
@Override
public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
PropertySource<?> system = environment.getPropertySources()
.get(SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME);
Map<String, Object> prefixed = new LinkedHashMap<>();
if (!hasOurPriceProperties(system)) {
// Baeldung-internal code so this doesn't break other examples
logger.warn("System environment variables [calculation_mode,gross_calculation_tax_rate] not detected, fallback to default value [calcuation_mode={},gross_calcuation_tax_rate={}]", CALCUATION_MODE_DEFAULT_VALUE,
GROSS_CALCULATION_TAX_RATE_DEFAULT_VALUE);
prefixed = names.stream()
.collect(Collectors.toMap(this::rename, this::getDefaultValue));
environment.getPropertySources()
.addAfter(SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME, new MapPropertySource("prefixer", prefixed));
return;
}
prefixed = names.stream()
.collect(Collectors.toMap(this::rename, system::getProperty));
environment.getPropertySources()
.addAfter(SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME, new MapPropertySource("prefixer", prefixed));
}
private Object getDefaultValue(String key) {
return defaults.get(key);
}
private String rename(String key) {
return PREFIX + key.replaceAll("\\_", ".");
}
private boolean hasOurPriceProperties(PropertySource<?> system) {
if (system.containsProperty(CALCUATION_MODE) && system.containsProperty(GROSS_CALCULATION_TAX_RATE)) {
return true;
} else
return false;
}
}

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/autoconfig/PriceCalculationAutoConfig.java Normal file
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package com.baeldung.environmentpostprocessor.autoconfig;
import org.springframework.boot.autoconfigure.AutoConfigureOrder;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import com.baeldung.environmentpostprocessor.calculator.GrossPriceCalculator;
import com.baeldung.environmentpostprocessor.calculator.NetPriceCalculator;
import com.baeldung.environmentpostprocessor.calculator.PriceCalculator;
@Configuration
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
public class PriceCalculationAutoConfig {
@Bean
@ConditionalOnProperty(name = "com.baeldung.environmentpostprocessor.calculation.mode", havingValue = "NET")
@ConditionalOnMissingBean
public PriceCalculator getNetPriceCalculator() {
return new NetPriceCalculator();
}
@Bean
@ConditionalOnProperty(name = "com.baeldung.environmentpostprocessor.calculation.mode", havingValue = "GROSS")
@ConditionalOnMissingBean
public PriceCalculator getGrossPriceCalculator() {
return new GrossPriceCalculator();
}
}

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/calculator/GrossPriceCalculator.java Normal file
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package com.baeldung.environmentpostprocessor.calculator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
public class GrossPriceCalculator implements PriceCalculator {
private static final Logger logger = LoggerFactory.getLogger(GrossPriceCalculator.class);
@Value("${com.baeldung.environmentpostprocessor.gross.calculation.tax.rate}")
double taxRate;
@Override
public double calculate(double singlePrice, int quantity) {
logger.info("Gross based price calculation with input parameters [singlePrice = {},quantity= {} ], {} percent tax applied.", singlePrice, quantity, taxRate * 100);
double netPrice = singlePrice * quantity;
double result = Math.round(netPrice * (1 + taxRate));
logger.info("Calcuation result is {}", result);
return result;
}
}

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/calculator/NetPriceCalculator.java Normal file
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package com.baeldung.environmentpostprocessor.calculator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class NetPriceCalculator implements PriceCalculator {
private static final Logger logger = LoggerFactory.getLogger(GrossPriceCalculator.class);
@Override
public double calculate(double singlePrice, int quantity) {
logger.info("Net based price calculation with input parameters [singlePrice = {},quantity= {} ], NO tax applied.", singlePrice, quantity);
double result = Math.round(singlePrice * quantity);
logger.info("Calcuation result is {}", result);
return result;
}
}

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/calculator/PriceCalculator.java Normal file
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package com.baeldung.environmentpostprocessor.calculator;
public interface PriceCalculator {
public double calculate(double singlePrice, int quantity);
}

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spring-boot-environment/src/main/java/com/baeldung/environmentpostprocessor/service/PriceCalculationService.java Normal file
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package com.baeldung.environmentpostprocessor.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.baeldung.environmentpostprocessor.calculator.PriceCalculator;
@Service
public class PriceCalculationService {
@Autowired
PriceCalculator priceCalculator;
public double productTotalPrice(double singlePrice, int quantity) {
return priceCalculator.calculate(singlePrice, quantity);
}
}

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spring-boot-environment/src/main/resources/META-INF/spring.factories Normal file
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org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.baeldung.environmentpostprocessor.autoconfig.PriceCalculationAutoConfig
org.springframework.boot.env.EnvironmentPostProcessor=\
com.baeldung.environmentpostprocessor.PriceCalculationEnvironmentPostProcessor

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spring-boot-environment/src/main/resources/application.properties Normal file
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management.endpoints.web.exposure.include=*
management.metrics.enable.root=true
management.metrics.enable.jvm=true
management.endpoint.restart.enabled=true
spring.datasource.jmx-enabled=false
spring.main.allow-bean-definition-overriding=true
management.endpoint.shutdown.enabled=true

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spring-boot-environment/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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spring-boot-environment/src/test/java/com/baeldung/environmentpostprocessor/PriceCalculationEnvironmentPostProcessorLiveTest.java Normal file
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package com.baeldung.environmentpostprocessor;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import com.baeldung.environmentpostprocessor.service.PriceCalculationService;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = PriceCalculationApplication.class)
public class PriceCalculationEnvironmentPostProcessorLiveTest {
@Autowired
PriceCalculationService pcService;
@Test
public void whenSetNetEnvironmentVariablebyDefault_thenNoTaxApplied() {
double total = pcService.productTotalPrice(100, 4);
assertEquals(400.0, total, 0);
}
}