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package com.sun.jersey.api.core;
import com.sun.jersey.core.spi.scanning.Scanner;
import com.sun.jersey.spi.container.ReloadListener;
import com.sun.jersey.spi.scanning.AnnotationScannerListener;
import com.sun.jersey.spi.scanning.PathProviderScannerListener;
import javax.ws.rs.Path;
import javax.ws.rs.ext.Provider;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A resource configuration that performs scanning to find root resource
* and provider classes.
*
* @author Paul.Sandoz@Sun.Com
*/
public class ScanningResourceConfig extends DefaultResourceConfig implements ReloadListener {
private static final Logger LOGGER =
Logger.getLogger(ScanningResourceConfig.class.getName());
private Scanner scanner;
private final Set<Class<?>> cachedClasses = new HashSet<Class<?>>();
/**
* Initialize and scan for root resource and provider classes
* using a scanner.
*
* @param scanner the scanner.
*/
public void init(final Scanner scanner) {
this.scanner = scanner;
final AnnotationScannerListener asl = new PathProviderScannerListener();
scanner.scan(asl);
getClasses().addAll(asl.getAnnotatedClasses());
if (LOGGER.isLoggable(Level.INFO) && !getClasses().isEmpty()) {
final Set<Class> rootResourceClasses = get(Path.class);
if (rootResourceClasses.isEmpty()) {
LOGGER.log(Level.INFO, "No root resource classes found.");
} else {
logClasses("Root resource classes found:", rootResourceClasses);
}
final Set<Class> providerClasses = get(Provider.class);
if (providerClasses.isEmpty()) {
LOGGER.log(Level.INFO, "No provider classes found.");
} else {
logClasses("Provider classes found:", providerClasses);
}
}
cachedClasses.clear();
cachedClasses.addAll(getClasses());
}
/**
* Perform a new search for resource classes and provider classes.
* <p/>
* Deprecated, use onReload instead.
*/
@Deprecated
public void reload() {
onReload();
}
/**
* Perform a new search for resource classes and provider classes.
*/
@Override
public void onReload() {
Set<Class<?>> classesToRemove = new HashSet<Class<?>>();
Set<Class<?>> classesToAdd = new HashSet<Class<?>>();
for(Class c : getClasses())
if(!cachedClasses.contains(c))
classesToAdd.add(c);
for(Class c : cachedClasses)
if(!getClasses().contains(c))
classesToRemove.add(c);
getClasses().clear();
init(scanner);
getClasses().addAll(classesToAdd);
getClasses().removeAll(classesToRemove);
}
private Set<Class> get(Class<? extends Annotation> ac) {
Set<Class> s = new HashSet<Class>();
for (Class c : getClasses())
if (c.isAnnotationPresent(ac))
s.add(c);
return s;
}
private void logClasses(String s, Set<Class> classes) {
final StringBuilder b = new StringBuilder();
b.append(s);
for (Class c : classes)
b.append('\n').append(" ").append(c);
LOGGER.log(Level.INFO, b.toString());
}
}