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aspectj introduction

This commit is contained in:
nguyenminhtuanfit@gmail.com 2016-11-04 07:57:11 +07:00
parent 5a6ab35333
commit 108adf84f6
10 changed files with 303 additions and 0 deletions
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aspectj/pom.xml Normal file
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<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>
<groupId>com.baeldung</groupId>
<artifactId>aspectj</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>aspectj</name>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>${aspectj.version}</version>
</dependency>
<!-- utils -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.version}</version>
</dependency>
<!-- unit test -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
</dependencies>
<build>
<finalName>aspectj</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${source.version}</source>
<target>${source.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.7</version>
<configuration>
<complianceLevel>${source.version}</complianceLevel>
<source>${source.version}</source>
<target>${source.version}</target>
<showWeaveInfo>true</showWeaveInfo>
<verbose>true</verbose>
<Xlint>ignore</Xlint>
<encoding>${project.build.sourceEncoding}</encoding>
<!-- Post-compile weaving -->
<!--
<weaveDependencies>
<weaveDependency>
<groupId>org.agroup</groupId>
<artifactId>to-weave</artifactId>
</weaveDependency>
<weaveDependency>
<groupId>org.anothergroup</groupId>
<artifactId>gen</artifactId>
</weaveDependency>
</weaveDependencies>
-->
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- <plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.10</version>
<configuration>
<argLine>-javaagent:"${settings.localRepository}"/org/aspectj/aspectjweaver/${aspectj.version}/aspectjweaver-${aspectj.version}.jar</argLine>
<useSystemClassLoader>true</useSystemClassLoader>
<forkMode>always</forkMode>
</configuration>
</plugin> -->
</plugins>
</build>
<properties>
<source.version>1.8</source.version>
<aspectj.version>1.6.11</aspectj.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<aspectj.version>1.8.9</aspectj.version>
<org.slf4j.version>1.7.21</org.slf4j.version>
<logback.version>1.1.7</logback.version>
<maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
<junit.version>4.12</junit.version>
</properties>
</project>

13
aspectj/src/main/java/com/baeldung/aspectj/Account.java Normal file
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package com.baeldung.aspectj;
public class Account {
int balance = 20;
public boolean withdraw(int amount) {
if (balance - amount > 0) {
balance = balance - amount;
return true;
} else
return false;
}
}

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aspectj/src/main/java/com/baeldung/aspectj/AccountAspect.aj Normal file
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package com.baeldung.aspectj;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public aspect AccountAspect {
private static final Logger logger = LoggerFactory.getLogger(AccountAspect.class);
final int MIN_BALANCE = 10;
pointcut callWithDraw(int amount, Account account):
call(boolean Account.withdraw(int)) && args(amount) && target(account);
before(int amount, Account account) : callWithDraw(amount, account) {
logger.info(" Balance before withdrawal: {}", account.balance);
logger.info(" Withdraw ammout: {}", amount);
}
boolean around(int amount, Account account) : callWithDraw(amount, account) {
if (account.balance - amount >= MIN_BALANCE)
return proceed(amount, account);
else {
logger.info("Withdrawal Rejected!");
return false;
}
}
after(int amount, Account balance) : callAtWithDraw(amount, balance) {
logger.info("Balance after withdrawal : {}", balance.balance);
}
}

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aspectj/src/main/java/com/baeldung/aspectj/Secured.java Normal file
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package com.baeldung.aspectj;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Secured {
public boolean isLocked() default false;
}

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aspectj/src/main/java/com/baeldung/aspectj/SecuredMethod.java Normal file
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package com.baeldung.aspectj;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SecuredMethod {
private static final Logger logger = LoggerFactory.getLogger(SecuredMethod.class);
@Secured(isLocked = true)
public void lockedMethod() throws Exception {
logger.info("lockedMethod");
}
@Secured(isLocked = false)
public void unlockedMethod() {
logger.info("unlockedMethod");
}
public static void main(String[] args) throws Exception {
SecuredMethod sv = new SecuredMethod();
sv.lockedMethod();
}
}

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aspectj/src/main/java/com/baeldung/aspectj/SecuredMethodAspect.java Normal file
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package com.baeldung.aspectj;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Aspect
public class SecuredMethodAspect {
private static final Logger logger = LoggerFactory.getLogger(SecuredMethodAspect.class);
@Pointcut("@annotation(secured)")
public void callAt(Secured secured) {
}
@Around("callAt(secured)")
public Object around(ProceedingJoinPoint pjp, Secured secured) throws Throwable {
if (secured.isLocked()) {
logger.info(pjp.getSignature().toLongString() + " is locked");
return null;
} else {
return pjp.proceed();
}
}
}

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aspectj/src/main/resources/META-INF/aop.xml Normal file
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<aspectj>
<aspects>
<aspect name="com.baeldung.aspectj.SecuredMethodAspect"/>
<weaver options="-verbose -showWeaveInfo">
<include within="com.baeldung.aspectj.*"/>
</weaver>
</aspects>
</aspectj>

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aspectj/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">
<layout class="ch.qos.logback.classic.PatternLayout">
<pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg %n</pattern>
</layout>
</appender>
<logger name="com.baeldung.hazelcast" level="INFO" additivity="false">
<appender-ref ref="STDOUT" />
</logger>
<root level="DEBUG">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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aspectj/src/test/java/com/baeldung/aspectj/test/AccountTest.java Normal file
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package com.baeldung.aspectj.test;
import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.aspectj.Account;
public class AccountTest {
private Account account;
@Before
public void before() {
account = new Account();
}
@Test
public void givenBalance20AndMinBalance10_whenWithdraw5_thenSuccess() {
assertTrue(account.withdraw(5));
}
@Test
public void givenBalance20AndMinBalance10_whenWithdraw100_thenFail() {
assertFalse(account.withdraw(100));
}
}

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aspectj/src/test/java/com/baeldung/aspectj/test/SecuredMethodTest.java Normal file
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package com.baeldung.aspectj.test;
import org.junit.Test;
import com.baeldung.aspectj.SecuredMethod;
public class SecuredMethodTest {
@Test
public void testMethod() throws Exception {
SecuredMethod service = new SecuredMethod();
service.unlockedMethod();
service.lockedMethod();
}
}