Merge pull request eugenp#5986 from codehunter34/BAEL-2399

eric-martin · web-flow · commit 874acddfcff3 · 2019-02-05T21:24:27.000-06:00
BAEL-2399: Guice vs Spring - Dependency Injection
diff --git a/guice/pom.xml b/guice/pom.xml
@@ -1,29 +1,45 @@
 <?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>
-    <groupId>com.baeldung.examples.guice</groupId>
-    <artifactId>guice</artifactId>
-    <version>1.0-SNAPSHOT</version>
-    <packaging>jar</packaging>
-    <name>guice</name>
+<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.examples.guice</groupId>
+	<artifactId>guice</artifactId>
+	<version>1.0-SNAPSHOT</version>
+	<packaging>jar</packaging>
+	<name>guice</name>
 
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
-    </parent>
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
 
-    <dependencies>
-        <dependency>
-            <groupId>com.google.inject</groupId>
-            <artifactId>guice</artifactId>
-            <version>${guice.version}</version>
-        </dependency>
-    </dependencies>
+	<dependencies>
+		<dependency>
+			<groupId>com.google.inject</groupId>
+			<artifactId>guice</artifactId>
+			<version>${guice.version}</version>
+		</dependency>
 
-    <properties>
-        <guice.version>4.1.0</guice.version>
-    </properties>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-context</artifactId>
+			<version>${spring.version}</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-test</artifactId>
+			<version>${springtest.version}</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<properties>
+		<guice.version>4.2.2</guice.version>
+		<spring.version>5.1.3.RELEASE</spring.version>
+		<springtest.version>5.1.3.RELEASE</springtest.version>
+	</properties>
 
 </project>
diff --git a/guice/src/main/java/com/baeldung/examples/common/Account.java b/guice/src/main/java/com/baeldung/examples/common/Account.java
@@ -0,0 +1,27 @@
+package com.baeldung.examples.common;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Account {
+
+	private String accountNumber;
+	private String type;
+
+	public String getAccountNumber() {
+		return accountNumber;
+	}
+
+	public void setAccountNumber(String accountNumber) {
+		this.accountNumber = accountNumber;
+	}
+
+	public String getType() {
+		return type;
+	}
+
+	public void setType(String type) {
+		this.type = type;
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/AccountService.java b/guice/src/main/java/com/baeldung/examples/common/AccountService.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface AccountService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/AccountServiceImpl.java b/guice/src/main/java/com/baeldung/examples/common/AccountServiceImpl.java
@@ -0,0 +1,8 @@
+package com.baeldung.examples.common;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class AccountServiceImpl implements AccountService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/AudioBookService.java b/guice/src/main/java/com/baeldung/examples/common/AudioBookService.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface AudioBookService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/AudioBookServiceImpl.java b/guice/src/main/java/com/baeldung/examples/common/AudioBookServiceImpl.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public class AudioBookServiceImpl implements AudioBookService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/AuthorService.java b/guice/src/main/java/com/baeldung/examples/common/AuthorService.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface AuthorService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/AuthorServiceImpl.java b/guice/src/main/java/com/baeldung/examples/common/AuthorServiceImpl.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public class AuthorServiceImpl implements AuthorService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/BookService.java b/guice/src/main/java/com/baeldung/examples/common/BookService.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface BookService {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/BookServiceImpl.java b/guice/src/main/java/com/baeldung/examples/common/BookServiceImpl.java
@@ -0,0 +1,10 @@
+package com.baeldung.examples.common;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class BookServiceImpl implements BookService {
+
+	@Autowired(required = false)
+	private AuthorService authorService;
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/PersonDao.java b/guice/src/main/java/com/baeldung/examples/common/PersonDao.java
@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface PersonDao {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/common/PersonDaoImpl.java b/guice/src/main/java/com/baeldung/examples/common/PersonDaoImpl.java
@@ -0,0 +1,8 @@
+package com.baeldung.examples.common;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class PersonDaoImpl implements PersonDao {
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/guice/Foo.java b/guice/src/main/java/com/baeldung/examples/guice/Foo.java
@@ -0,0 +1,4 @@
+package com.baeldung.examples.guice;
+
+public class Foo {
+}
diff --git a/guice/src/main/java/com/baeldung/examples/guice/FooProcessor.java b/guice/src/main/java/com/baeldung/examples/guice/FooProcessor.java
@@ -0,0 +1,12 @@
+package com.baeldung.examples.guice;
+
+import org.springframework.lang.Nullable;
+
+import com.google.inject.Inject;
+
+public class FooProcessor {
+
+	@Inject
+	@Nullable
+	private Foo foo;
+}
diff --git a/guice/src/main/java/com/baeldung/examples/guice/GuicePersonService.java b/guice/src/main/java/com/baeldung/examples/guice/GuicePersonService.java
@@ -0,0 +1,19 @@
+package com.baeldung.examples.guice;
+
+import com.baeldung.examples.common.PersonDao;
+import com.google.inject.Inject;
+
+public class GuicePersonService {
+
+	@Inject
+	private PersonDao personDao;
+
+	public PersonDao getPersonDao() {
+		return personDao;
+	}
+
+	public void setPersonDao(PersonDao personDao) {
+		this.personDao = personDao;
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/guice/GuiceUserService.java b/guice/src/main/java/com/baeldung/examples/guice/GuiceUserService.java
@@ -0,0 +1,19 @@
+package com.baeldung.examples.guice;
+
+import com.baeldung.examples.common.AccountService;
+import com.google.inject.Inject;
+
+public class GuiceUserService {
+
+	@Inject
+	private AccountService accountService;
+
+	public AccountService getAccountService() {
+		return accountService;
+	}
+
+	public void setAccountService(AccountService accountService) {
+		this.accountService = accountService;
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/guice/Person.java b/guice/src/main/java/com/baeldung/examples/guice/Person.java
@@ -0,0 +1,24 @@
+package com.baeldung.examples.guice;
+
+public class Person {
+	private String firstName;
+
+	private String lastName;
+
+	public String getFirstName() {
+		return firstName;
+	}
+
+	public void setFirstName(String firstName) {
+		this.firstName = firstName;
+	}
+
+	public String getLastName() {
+		return lastName;
+	}
+
+	public void setLastName(String lastName) {
+		this.lastName = lastName;
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/guice/modules/GuiceModule.java b/guice/src/main/java/com/baeldung/examples/guice/modules/GuiceModule.java
@@ -0,0 +1,50 @@
+package com.baeldung.examples.guice.modules;
+
+import com.baeldung.examples.common.AccountService;
+import com.baeldung.examples.common.AccountServiceImpl;
+import com.baeldung.examples.common.BookService;
+import com.baeldung.examples.common.BookServiceImpl;
+import com.baeldung.examples.common.PersonDao;
+import com.baeldung.examples.common.PersonDaoImpl;
+import com.baeldung.examples.guice.Foo;
+import com.baeldung.examples.guice.Person;
+import com.google.inject.AbstractModule;
+import com.google.inject.Provider;
+import com.google.inject.Provides;
+
+public class GuiceModule extends AbstractModule {
+
+	@Override
+	protected void configure() {
+		try {
+			bind(AccountService.class).to(AccountServiceImpl.class);
+			bind(Person.class).toConstructor(Person.class.getConstructor());
+			// bind(Person.class).toProvider(new Provider<Person>() {
+			// public Person get() {
+			// Person p = new Person();
+			// return p;
+			// }
+			// });
+			bind(Foo.class).toProvider(new Provider<Foo>() {
+				public Foo get() {
+					return null;
+				}
+			});
+			bind(PersonDao.class).to(PersonDaoImpl.class);
+
+		} catch (NoSuchMethodException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} catch (SecurityException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+
+	}
+
+	@Provides
+	public BookService bookServiceGenerator() {
+		return new BookServiceImpl();
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/spring/SpringBeansConfig.java b/guice/src/main/java/com/baeldung/examples/spring/SpringBeansConfig.java
@@ -0,0 +1,17 @@
+package com.baeldung.examples.spring;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.baeldung.examples.common.AudioBookService;
+import com.baeldung.examples.common.AudioBookServiceImpl;
+
+@Configuration
+public class SpringBeansConfig {
+
+	@Bean
+	public AudioBookService audioBookServiceGenerator() {
+		return new AudioBookServiceImpl();
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/spring/SpringMainConfig.java b/guice/src/main/java/com/baeldung/examples/spring/SpringMainConfig.java
@@ -0,0 +1,21 @@
+package com.baeldung.examples.spring;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+
+import com.baeldung.examples.common.BookService;
+import com.baeldung.examples.common.BookServiceImpl;
+
+@Configuration
+@Import({ SpringBeansConfig.class })
+@ComponentScan("com.baeldung.examples")
+public class SpringMainConfig {
+
+	@Bean
+	public BookService bookServiceGenerator() {
+		return new BookServiceImpl();
+	}
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/spring/SpringPersonService.java b/guice/src/main/java/com/baeldung/examples/spring/SpringPersonService.java
@@ -0,0 +1,22 @@
+package com.baeldung.examples.spring;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.baeldung.examples.common.PersonDao;
+
+@Component
+public class SpringPersonService {
+
+    @Autowired
+    private PersonDao personDao;
+
+    public PersonDao getPersonDao() {
+        return personDao;
+    }
+
+    public void setPersonDao(PersonDao personDao) {
+        this.personDao = personDao;
+    }
+
+}
diff --git a/guice/src/main/java/com/baeldung/examples/spring/UserService.java b/guice/src/main/java/com/baeldung/examples/spring/UserService.java
@@ -0,0 +1,22 @@
+package com.baeldung.examples.spring;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.baeldung.examples.common.AccountService;
+
+@Component
+public class UserService {
+
+	@Autowired
+	private AccountService accountService;
+
+	public AccountService getAccountService() {
+		return accountService;
+	}
+
+	public void setAccountService(AccountService accountService) {
+		this.accountService = accountService;
+	}
+
+}
diff --git a/guice/src/test/java/com/baeldung/examples/GuiceUnitTest.java b/guice/src/test/java/com/baeldung/examples/GuiceUnitTest.java
diff --git a/guice/src/test/java/com/baeldung/examples/SpringUnitTest.java b/guice/src/test/java/com/baeldung/examples/SpringUnitTest.java

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +package com.baeldung.examples.common;
++
 +public interface AccountService {
++
 +}