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Allow the SpringApplication class used by the CLI to be configured

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This commit adds support to the CLI for launching a custom
SpringApplication implementation. The class that is launched can be
configured using the spring.application.class.name System property
or the SPRING_APPLICATION_CLASS_NAME environment variable with the
former taking priority.

Closes gh-2030
This commit is contained in:
Andy Wilkinson
2014-12-02 10:01:05 +00:00
parent 064f88a9fb
commit 8520554eb2
2 changed files with 189 additions and 6 deletions
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33
spring-boot-cli/src/main/java/org/springframework/boot/cli/app/SpringApplicationLauncher.java
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@@ -22,21 +22,26 @@ import java.util.HashMap;
import java.util.Map;
/**
* A launcher for {@code SpringApplication}. Uses reflection to allow the launching code
* to exist in a separate ClassLoader from the application code.
* A launcher for {@code SpringApplication} or a {@code SpringApplication} subclass. The
* class that is used can be configured using the System property
* {@code spring.application.class.name} or the {@code SPRING_APPLICATION_CLASS_NAME}
* environment variable. Uses reflection to allow the launching code to exist in a
* separate ClassLoader from the application code.
*
* @author Andy Wilkinson
* @since 1.2.0
* @see System#getProperty(String)
* @see System#getenv(String)
*/
public class SpringApplicationLauncher {
private static final String SPRING_APPLICATION_CLASS = "org.springframework.boot.SpringApplication";
private static final String DEFAULT_SPRING_APPLICATION_CLASS = "org.springframework.boot.SpringApplication";
private final ClassLoader classLoader;
/**
* Creates a new launcher that will use the given {@code classLoader} to load
* {@code SpringApplication}.
* Creates a new launcher that will use the given {@code classLoader} to load the
* configured {@code SpringApplication} class.
* @param classLoader the {@code ClassLoader} to use
*/
public SpringApplicationLauncher(ClassLoader classLoader) {
@@ -54,7 +59,8 @@ public class SpringApplicationLauncher {
public Object launch(Object[] sources, String[] args) throws Exception {
Map<String, Object> defaultProperties = new HashMap<String, Object>();
defaultProperties.put("spring.groovy.template.check-template-location", "false");
Class<?> applicationClass = this.classLoader.loadClass(SPRING_APPLICATION_CLASS);
Class<?> applicationClass = this.classLoader
.loadClass(getSpringApplicationClassName());
Constructor<?> constructor = applicationClass.getConstructor(Object[].class);
Object application = constructor.newInstance((Object) sources);
applicationClass.getMethod("setDefaultProperties", Map.class).invoke(application,
@@ -63,4 +69,19 @@ public class SpringApplicationLauncher {
return method.invoke(application, (Object) args);
}
private String getSpringApplicationClassName() {
String className = System.getProperty("spring.application.class.name");
if (className == null) {
className = getEnvironmentVariable("SPRING_APPLICATION_CLASS_NAME");
}
if (className == null) {
className = DEFAULT_SPRING_APPLICATION_CLASS;
}
return className;
}
protected String getEnvironmentVariable(String name) {
return System.getenv(name);
}
}