com.sun.faces.spi.InjectionProviderFactory Maven / Gradle / Ivy
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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.spi;
import static java.util.logging.Level.WARNING;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.faces.RIConstants;
import com.sun.faces.config.WebConfiguration;
import com.sun.faces.config.WebConfiguration.WebContextInitParameter;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
import com.sun.faces.vendor.WebContainerInjectionProvider;
import jakarta.faces.context.ExternalContext;
import jakarta.servlet.ServletContext;
/**
*
* A factory for creating InjectionProvider instances.
*
*/
public class InjectionProviderFactory {
/**
*
* Our no-op InjectionProvider.
*
*/
private static final InjectionProvider NOOP_PROVIDER = new NoopInjectionProvider();
private static final InjectionProvider GENERIC_WEB_PROVIDER = new WebContainerInjectionProvider();
private static final String INJECTION_SERVICE = "META-INF/services/com.sun.faces.spi.injectionprovider";
/**
*
* The system property that will be checked for alternate InjectionProvider implementations.
*
*/
private static final String INJECTION_PROVIDER_PROPERTY = RIConstants.FACES_PREFIX + "InjectionProvider";
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
private static final String[] EMPTY_ARRAY = new String[] {};
/**
*
* Creates a new instance of the class specified by the com.sun.faces.InjectionProvider system property. If
* this propery is not defined, then a default, no-op, InjectionProvider will be returned.
*
* @param extContext ExteranlContext for the current request
*
* @return an implementation of the InjectionProvider interfaces
*/
public static InjectionProvider createInstance(ExternalContext extContext) {
String providerClass = findProviderClass(extContext);
InjectionProvider provider = getProviderInstance(providerClass, extContext);
if (!NoopInjectionProvider.class.equals(provider.getClass()) && !WebContainerInjectionProvider.class.equals(provider.getClass())) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, "faces.spi.injection.provider_configured", new Object[] { provider.getClass().getName() });
}
return provider;
} else if (WebContainerInjectionProvider.class.equals(provider.getClass())) {
LOGGER.info("faces.core.injection.provider_generic_web_configured");
return provider;
} else {
LOGGER.log(WARNING, "faces.spi.injection.no_injection");
return provider;
}
}
private static InjectionProvider getProviderInstance(String className, ExternalContext extContext) {
InjectionProvider provider = NOOP_PROVIDER;
if (className != null) {
try {
Class clazz = Util.loadClass(className, InjectionProviderFactory.class);
if (implementsInjectionProvider(clazz)) {
try {
Constructor ctor = clazz.getConstructor(ServletContext.class);
return (InjectionProvider) ctor.newInstance((ServletContext) extContext.getContext());
} catch (NoSuchMethodException nsme) {
return (InjectionProvider) clazz.newInstance();
} catch (InvocationTargetException ite) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.provider_cannot_instantiate", new Object[] { className });
LOGGER.log(Level.SEVERE, "", ite);
}
}
} else {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.provider_not_implemented", new Object[] { className });
}
}
} catch (ClassNotFoundException cnfe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.provider_not_found", new Object[] { className });
}
} catch (InstantiationException | IllegalAccessException ie) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.provider_cannot_instantiate", new Object[] { className });
LOGGER.log(Level.SEVERE, "", ie);
}
}
}
// We weren't able to find a configured provider - check
// to see if the PostConstruct and PreDestroy annotations
// are available. If they are, then default to the
// WebContainerInjectionProvider, otherwise, use
// NoopInjectionProvider
if (NOOP_PROVIDER.equals(provider)) {
try {
if (Util.loadClass("jakarta.annotation.PostConstruct", null) != null && Util.loadClass("jakarta.annotation.PreDestroy", null) != null) {
provider = GENERIC_WEB_PROVIDER;
}
} catch (Exception e) {
provider = NOOP_PROVIDER;
}
}
return provider;
}
/**
*
* Determine if the specified class implements the InjectionProvider interfaces.
*
*
* @param clazz the class in question
* @return true if clazz implements the InjectionProvider interface
*/
private static boolean implementsInjectionProvider(Class clazz) {
return InjectionProvider.class.isAssignableFrom(clazz);
}
/**
*
* Determine if the specified class extends the DiscoverableInjectionProvider interfaces.
*
*
* @param clazz the class in question
* @return true if clazz implements the InjectionProvider interface
*/
private static boolean extendsDiscoverableInjectionProvider(Class clazz) {
return DiscoverableInjectionProvider.class.isAssignableFrom(clazz);
}
/**
*
* Attempt to find an InjectionProvider based on the following algorithm:
*
*
* - Check for an explicit configuration within the web.xml using the key
*
com.sun.faces.injectionProvider. If found, return the value.
* - Check for a system property keyed by
com.sun.faces.InjectionProvider. If found, return the
* value.
* - Check for entries within
META-INF/services/com.sun.faces.injectionprovider. If entries are found and
* the entries extend DiscoverableInjectionProvider, invoke
* isInjectionFeatureAvailable(String) passing in the configured delegate. If
* isInjectionFeatureAvailable(String) returns true return the service entry.
* - If no
InjectionProviders are found, return null Tries to find a provider class in a web
* context parameter. If not present it tries to find it as a System property. If still not found returns null.
*
*
* @param extContext The ExternalContext for this request
* @return The provider class name specified in the container configuration, or null if not found.
*/
private static String findProviderClass(ExternalContext extContext) {
WebConfiguration webConfig = WebConfiguration.getInstance(extContext);
String provider = webConfig.getOptionValue(WebContextInitParameter.InjectionProviderClass);
if (provider != null) {
return provider;
} else {
provider = System.getProperty(INJECTION_PROVIDER_PROPERTY);
}
if (provider != null) {
return provider;
} else {
String[] serviceEntries = getServiceEntries();
if (serviceEntries.length > 0) {
for (int i = 0; i < serviceEntries.length; i++) {
provider = getProviderFromEntry(extContext.getApplicationMap(), serviceEntries[i]);
if (provider != null) {
break;
}
}
} else {
return provider;
}
}
return provider;
}
private static String getProviderFromEntry(Map appMap, String entry) {
if (entry == null) {
return null;
}
String[] parts = Util.split(appMap, entry, ":");
if (parts.length != 2) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.invalid_service_entry", new Object[] { entry });
}
return null;
}
try {
Class clazz = Util.loadClass(parts[0], null);
if (extendsDiscoverableInjectionProvider(clazz)) {
if (DiscoverableInjectionProvider.isInjectionFeatureAvailable(parts[1])) {
return parts[0];
}
} else {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.provider.entry_not_discoverable", new Object[] { parts[0] });
}
return null;
}
} catch (ClassNotFoundException cnfe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.injection.provider_not_found", new Object[] { parts[0] });
}
return null;
}
return null;
}
private static String[] getServiceEntries() {
List results = null;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader == null) {
return EMPTY_ARRAY;
}
Enumeration urls = null;
try {
urls = loader.getResources(INJECTION_SERVICE);
} catch (IOException ioe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, ioe.toString(), ioe);
}
}
if (urls != null) {
InputStream input = null;
BufferedReader reader = null;
while (urls.hasMoreElements()) {
try {
if (results == null) {
results = new ArrayList<>();
}
URL url = urls.nextElement();
URLConnection conn = url.openConnection();
conn.setUseCaches(false);
input = conn.getInputStream();
if (input != null) {
try {
reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));
} catch (Exception e) {
// The DM_DEFAULT_ENCODING warning is acceptable here
// because we explicitly *want* to use the Java runtime's
// default encoding.
reader = new BufferedReader(new InputStreamReader(input));
}
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
results.add(line.trim());
}
}
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "faces.spi.provider.cannot_read_service", new Object[] { INJECTION_SERVICE });
LOGGER.log(Level.SEVERE, e.toString(), e);
}
} finally {
if (input != null) {
try {
input.close();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.log(Level.FINEST, "Closing stream", e);
}
}
}
if (reader != null) {
try {
reader.close();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.log(Level.FINEST, "Closing stream", e);
}
}
}
}
}
}
return results != null && !results.isEmpty() ? results.toArray(new String[results.size()]) : EMPTY_ARRAY;
}
/**
*
* A no-op implementation of InjectionProvider which will be used when the #INJECTION_PROVIDER_PROPERTY is
* not specified or is invalid.
*
*/
private static final class NoopInjectionProvider implements InjectionProvider, AnnotationScanner {
/**
*
* This is a no-op.
*
*
* @param managedBean target ManagedBean
*/
@Override
public void inject(Object managedBean) {
}
@Override
public Map> getAnnotatedClassesInCurrentModule(ServletContext extContext)
throws InjectionProviderException {
return Collections.emptyMap();
}
/**
*
* This is a no-op.
*
*
* @param managedBean target ManagedBean
*/
@Override
public void invokePreDestroy(Object managedBean) {
}
/**
*
* This is a no-op.
*
*
* @param managedBean target ManagedBean
*/
@Override
public void invokePostConstruct(Object managedBean) throws InjectionProviderException {
}
}
} // END InjectionProviderFactory