initial commit

master
Josha von Gizycki 8 years ago
commit 0c2cfaa13b

3
.gitignore vendored

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*.iml
.idea/
target/

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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>
<groupId>de.joshavg</groupId>
<artifactId>simpledic</artifactId>
<version>0.1-SNAPSHOT</version>
<name>SimpleDiContainer</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>com.google.collections</groupId>
<artifactId>google-collections</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>

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package de.joshavg.simpledic;
import com.google.common.annotations.VisibleForTesting;
import de.joshavg.simpledic.exception.ContainerInitException;
import de.joshavg.simpledic.exception.DependencyNotSatisfiedException;
import de.joshavg.simpledic.exception.SdicClassNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
import java.util.function.Function;
import java.util.stream.Collectors;
public class SdiContainer {
private final Properties props;
@VisibleForTesting
SdiContainer(Properties props) {
this.props = props;
}
public static SdiContainer load() {
return load("sdic.properties");
}
public static SdiContainer load(String filename) {
Properties props = new Properties();
InputStream inputStream = SdiContainer.class.getClassLoader().getResourceAsStream(filename);
try {
props.load(inputStream);
} catch (IOException e) {
throw new ContainerInitException("failed loading properties", e);
}
SdiContainer container = new SdiContainer(props);
container.integrityCheck();
return container;
}
private void integrityCheck() {
List<Class<?>> services = fetchAllServices();
checkConstructorDependencies(services);
}
private List<Class<?>> fetchAllServices() {
return props.entrySet().stream()
.filter(e -> isServiceName(e.getKey().toString()))
.map(e -> e.getValue().toString())
.map(n -> {
try {
return Class.forName(n);
} catch (ClassNotFoundException e) {
throw new SdicClassNotFoundException(e);
}
}).collect(Collectors.toList());
}
private void checkConstructorDependencies(List<Class<?>> services) {
for(Class<?> c : services) {
Constructor<?>[] constructors = c.getDeclaredConstructors();
for(Constructor constructor : constructors) {
Class[] parameterTypes = constructor.getParameterTypes();
System.out.println(Arrays.toString(parameterTypes));
System.out.println(Arrays.asList(parameterTypes));
}
}
/* services.stream()
// get all constructors
.map(Class::getDeclaredConstructors)
.reduce(new ArrayList<Constructor>(),
(l, arr) -> {
l.addAll(Arrays.asList(arr));
return l;
},
(l1, l2) -> l1)
// get all parameter types
.stream()
.map(Constructor::getParameterTypes)
.reduce(new ArrayList<Class<?>>(),
(l, arr) -> {
l.addAll(Arrays.asList(arr));
return l;
},
(l1, l2) -> l1)
// search for services with needed types
.stream()
.distinct()
.forEach(t -> {
if (!services.contains(t)) {
throw new DependencyNotSatisfiedException(t);
}
});*/
}
@VisibleForTesting
static boolean isServiceName(String name) {
return name.startsWith("service.");
}
}

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package de.joshavg.simpledic.exception;
public class ContainerInitException extends RuntimeException {
public ContainerInitException(String message, Throwable cause) {
super(message, cause);
}
}

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package de.joshavg.simpledic.exception;
public class DependencyNotSatisfiedException extends RuntimeException {
public DependencyNotSatisfiedException(Class<?> dependency) {
super(String.format("Dependency %s not satisfied", dependency.getName()));
}
}

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package de.joshavg.simpledic.exception;
public class NoDefaultConstructorException extends RuntimeException {
public NoDefaultConstructorException(Throwable cause) {
super(cause);
}
}

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package de.joshavg.simpledic.exception;
public class SdicClassNotFoundException extends RuntimeException {
public SdicClassNotFoundException(Throwable cause) {
super(cause);
}
}

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package de.joshavg.simpledic;
public class NoDependencies {
}

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package de.joshavg.simpledic;
public class ServiceOne {
public ServiceOne(NoDependencies b) {
}
}

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package de.joshavg.simpledic;
import org.junit.Test;
public class TestProperties {
@Test
public void testIntegrityCheck() {
SdiContainer.load("test.properties");
}
}

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service.one: de.joshavg.simpledic.ServiceOne
service.nodeps: de.joshavg.simpledic.NoDependencies
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