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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.cxf.bus.extension;
import java.io.InputStream;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
import org.apache.cxf.Bus;
import org.apache.cxf.BusFactory;
import org.apache.cxf.binding.BindingFactoryManager;
import org.apache.cxf.bus.managers.BindingFactoryManagerImpl;
import org.apache.cxf.bus.managers.ConduitInitiatorManagerImpl;
import org.apache.cxf.bus.managers.DestinationFactoryManagerImpl;
import org.apache.cxf.buslifecycle.BusCreationListener;
import org.apache.cxf.buslifecycle.BusLifeCycleManager;
import org.apache.cxf.common.util.SystemPropertyAction;
import org.apache.cxf.configuration.ConfiguredBeanLocator;
import org.apache.cxf.configuration.Configurer;
import org.apache.cxf.configuration.NullConfigurer;
import org.apache.cxf.feature.Feature;
import org.apache.cxf.interceptor.AbstractBasicInterceptorProvider;
import org.apache.cxf.resource.DefaultResourceManager;
import org.apache.cxf.resource.ObjectTypeResolver;
import org.apache.cxf.resource.PropertiesResolver;
import org.apache.cxf.resource.ResourceManager;
import org.apache.cxf.resource.ResourceResolver;
import org.apache.cxf.resource.SinglePropertyResolver;
import org.apache.cxf.transport.ConduitInitiatorManager;
import org.apache.cxf.transport.DestinationFactoryManager;
/**
* This bus uses CXF's built in extension manager to load components
* (as opposed to using the Spring bus implementation). While this is faster
* to load it doesn't allow extensive configuration and customization like
* the Spring bus does.
*/
public class ExtensionManagerBus extends AbstractBasicInterceptorProvider implements Bus {
public static final String BUS_PROPERTY_NAME = "bus";
private static final String BUS_ID_PROPERTY_NAME = "org.apache.cxf.bus.id";
protected final Map, Object> extensions;
protected final Set> missingExtensions;
protected String id;
private BusState state;
private final Collection features = new CopyOnWriteArrayList<>();
private final Map properties = new ConcurrentHashMap<>(16, 0.75f, 4);
private final ExtensionManagerImpl extensionManager;
public ExtensionManagerBus(Map, Object> extensions, Map props,
ClassLoader extensionClassLoader) {
this.extensions = extensions == null ? new ConcurrentHashMap<>(16, 0.75f, 4)
: new ConcurrentHashMap<>(extensions);
this.missingExtensions = new CopyOnWriteArraySet<>();
state = BusState.INITIAL;
BusFactory.possiblySetDefaultBus(this);
if (null != props) {
properties.putAll(props);
}
Configurer configurer = (Configurer)this.extensions.get(Configurer.class);
if (null == configurer) {
configurer = new NullConfigurer();
this.extensions.put(Configurer.class, configurer);
}
id = getBusId(properties);
ResourceManager resourceManager = new DefaultResourceManager();
properties.put(BUS_ID_PROPERTY_NAME, BUS_PROPERTY_NAME);
properties.put(BUS_PROPERTY_NAME, this);
properties.put(DEFAULT_BUS_ID, this);
ResourceResolver propertiesResolver = new PropertiesResolver(properties);
resourceManager.addResourceResolver(propertiesResolver);
ResourceResolver busResolver = new SinglePropertyResolver(BUS_PROPERTY_NAME, this);
resourceManager.addResourceResolver(busResolver);
resourceManager.addResourceResolver(new ObjectTypeResolver(this));
busResolver = new SinglePropertyResolver(DEFAULT_BUS_ID, this);
resourceManager.addResourceResolver(busResolver);
resourceManager.addResourceResolver(new ObjectTypeResolver(this));
resourceManager.addResourceResolver(new ResourceResolver() {
public T resolve(String resourceName, Class resourceType) {
if (extensionManager != null) {
return extensionManager.getExtension(resourceName, resourceType);
}
return null;
}
public InputStream getAsStream(String name) {
return null;
}
});
this.extensions.put(ResourceManager.class, resourceManager);
extensionManager = new ExtensionManagerImpl(new String[0],
extensionClassLoader,
this.extensions,
resourceManager,
this);
setState(BusState.INITIAL);
if (null == this.getExtension(DestinationFactoryManager.class)) {
new DestinationFactoryManagerImpl(this);
}
if (null == this.getExtension(ConduitInitiatorManager.class)) {
new ConduitInitiatorManagerImpl(this);
}
if (null == this.getExtension(BindingFactoryManager.class)) {
new BindingFactoryManagerImpl(this);
}
extensionManager.load(new String[] {ExtensionManagerImpl.BUS_EXTENSION_RESOURCE});
extensionManager.activateAllByType(ResourceResolver.class);
this.extensions.put(ExtensionManager.class, extensionManager);
}
public ExtensionManagerBus(Map, Object> e, Map properties) {
this(e, properties, Thread.currentThread().getContextClassLoader());
}
public ExtensionManagerBus(Map, Object> e) {
this(e, null, Thread.currentThread().getContextClassLoader());
}
public ExtensionManagerBus() {
this(null, null, Thread.currentThread().getContextClassLoader());
}
protected final void setState(BusState state) {
this.state = state;
}
public void setId(String i) {
id = i;
}
public final T getExtension(Class extensionType) {
Object obj = extensions.get(extensionType);
if (obj == null) {
if (missingExtensions.contains(extensionType)) {
//already know we cannot find it
return null;
}
ConfiguredBeanLocator loc = (ConfiguredBeanLocator)extensions.get(ConfiguredBeanLocator.class);
if (loc == null) {
loc = createConfiguredBeanLocator();
}
if (loc != null) {
obj = loc.getBeanOfType(extensionType.getName(), extensionType);
if (obj != null) {
extensions.put(extensionType, obj);
} else {
//force loading
Collection objs = loc.getBeansOfType(extensionType);
if (objs != null && !objs.isEmpty()) {
extensions.put(extensionType, objs.iterator().next());
}
obj = extensions.get(extensionType);
}
}
}
if (null != obj) {
return extensionType.cast(obj);
}
//record that it couldn't be found to avoid expensive searches again in the future
missingExtensions.add(extensionType);
return null;
}
public boolean hasExtensionByName(String name) {
for (Class c : extensions.keySet()) {
if (name.equals(c.getName())) {
return true;
}
}
ConfiguredBeanLocator loc = (ConfiguredBeanLocator)extensions.get(ConfiguredBeanLocator.class);
if (loc == null) {
loc = createConfiguredBeanLocator();
}
if (loc != null) {
return loc.hasBeanOfName(name);
}
return false;
}
protected final synchronized ConfiguredBeanLocator createConfiguredBeanLocator() {
ConfiguredBeanLocator loc = (ConfiguredBeanLocator)extensions.get(ConfiguredBeanLocator.class);
if (loc == null) {
loc = extensionManager;
this.setExtension(loc, ConfiguredBeanLocator.class);
}
return loc;
}
public final void setExtension(T extension, Class extensionType) {
if (extension == null) {
extensions.remove(extensionType);
missingExtensions.add(extensionType);
} else {
extensions.put(extensionType, extension);
missingExtensions.remove(extensionType);
}
}
public String getId() {
return null == id ? DEFAULT_BUS_ID + Integer.toString(Math.abs(this.hashCode())) : id;
}
public void initialize() {
setState(BusState.INITIALIZING);
Collection ls = getExtension(ConfiguredBeanLocator.class)
.getBeansOfType(BusCreationListener.class);
for (BusCreationListener l : ls) {
l.busCreated(this);
}
doInitializeInternal();
BusLifeCycleManager lifeCycleManager = this.getExtension(BusLifeCycleManager.class);
if (null != lifeCycleManager) {
lifeCycleManager.initComplete();
}
setState(BusState.RUNNING);
}
protected void doInitializeInternal() {
extensionManager.initialize();
initializeFeatures();
}
protected void loadAdditionalFeatures() {
}
protected void initializeFeatures() {
loadAdditionalFeatures();
for (Feature f : features) {
f.initialize(this);
}
}
public void shutdown() {
shutdown(true);
}
protected void destroyBeans() {
extensionManager.destroyBeans();
}
public void shutdown(boolean wait) {
if (state == BusState.SHUTTING_DOWN) {
return;
}
BusLifeCycleManager lifeCycleManager = this.getExtension(BusLifeCycleManager.class);
if (null != lifeCycleManager) {
lifeCycleManager.preShutdown();
}
synchronized (this) {
state = BusState.SHUTTING_DOWN;
}
destroyBeans();
synchronized (this) {
state = BusState.SHUTDOWN;
notifyAll();
}
if (null != lifeCycleManager) {
lifeCycleManager.postShutdown();
}
if (BusFactory.getDefaultBus(false) == this) {
BusFactory.setDefaultBus(null);
}
BusFactory.clearDefaultBusForAnyThread(this);
}
public BusState getState() {
return state;
}
public Collection getFeatures() {
return features;
}
public synchronized void setFeatures(Collection features) {
this.features.clear();
this.features.addAll(features);
if (state == BusState.RUNNING) {
initializeFeatures();
}
}
public interface ExtensionFinder {
T findExtension(Class cls);
}
public Map getProperties() {
return properties;
}
public void setProperties(Map map) {
properties.clear();
properties.putAll(map);
}
public Object getProperty(String s) {
return properties.get(s);
}
public void setProperty(String s, Object o) {
if (o == null) {
properties.remove(s);
} else {
properties.put(s, o);
}
}
private static String getBusId(Map properties) {
String busId;
// first check properties
if (null != properties) {
busId = (String)properties.get(BUS_ID_PROPERTY_NAME);
if (null != busId && !busId.isEmpty()) {
return busId;
}
}
// next check system properties
busId = SystemPropertyAction.getPropertyOrNull(BUS_ID_PROPERTY_NAME);
if (null != busId && !busId.isEmpty()) {
return busId;
}
// otherwise use null so the default will be used
return null;
}
}
