org.apache.openejb.loader.SystemInstance Maven / Gradle / Ivy
The newest version!
/*
* 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.openejb.loader;
import org.apache.openejb.loader.event.ComponentAdded;
import org.apache.openejb.loader.event.ComponentRemoved;
import org.apache.openejb.observer.ObserverManager;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
/**
* This class aims to be the one and only static in the entire system
* A static, singleton, instance of this class can be created with the {@link #init(Properties)} method
*
* It is assumed that only one singleton per classloader is possible in any given VM
* Thus loading this instance in a classloader will mean there can only be one OpenEJB
* instance for that classloader and all children classloaders.
*
* @version $Revision$ $Date$
* @org.apache.xbean.XBean element="system"
*/
public final class SystemInstance {
private static final String PROFILE_PROP = "openejb.profile";
private static final String DEFAULT_PROFILE = "development";
private final long startTime = System.currentTimeMillis();
/**
* Properties that have to be away from System (i.e. {@link System#setProperty(String, String)} must not be called)
*/
private final Properties internalProperties = new Properties(System.getProperties());
private final Options options;
/**
* Properties that need to be set to System via {@link System#setProperty(String, String)}
* FIXME: Some properties are doubled in internal and external prop sets, but it simplifies get's
*/
private final Properties externalProperties = new Properties();
private final FileUtils home;
private final FileUtils base;
private final ClassLoader classLoader;
private final HashMap components;
private final ClassPath classPath;
private final ObserverManager observerManager = new ObserverManager();
// FIXME: Why is Exception thrown at all? It's almost impossible that it'll happen.
private SystemInstance(final Properties properties) throws Exception {
this.components = new HashMap();
// import JVM system property config (if a resource/container/... is set through this way)
final Properties clonedSystemProperties = (Properties) System.getProperties().clone();
for (final Map.Entry e : clonedSystemProperties.entrySet()) {
final String key = e.getKey().toString();
if (key.startsWith("sun.")) {
continue;
}
if (key.startsWith("os.")) {
continue;
}
if (key.startsWith("user.")) {
continue;
}
if (key.startsWith("awt.")) {
continue;
}
if (key.startsWith("java.")) {
final String pkg = key.substring("java.".length());
if (pkg.startsWith("vm.")) {
continue;
}
if (pkg.startsWith("runtime.")) {
continue;
}
if (pkg.startsWith("awt.")) {
continue;
}
if (pkg.startsWith("specification.")) {
continue;
}
if (pkg.startsWith("class.")) {
continue;
}
if (pkg.startsWith("library.")) {
continue;
}
if (pkg.startsWith("ext.")) {
continue;
}
if (pkg.startsWith("vendor.")) {
continue;
}
if (pkg.startsWith("endorsed.")) {
continue;
}
}
this.internalProperties.put(e.getKey(), e.getValue());
}
this.internalProperties.putAll(properties);
this.options = new Options(internalProperties, new Options(System.getProperties()));
this.home = new FileUtils("openejb.home", "user.dir", this.internalProperties);
this.base = new FileUtils("openejb.base", "openejb.home", this.internalProperties);
this.classPath = ClassPathFactory.createClassPath(this.internalProperties.getProperty("openejb.loader", "context"));
this.classLoader = classPath.getClassLoader();
this.internalProperties.setProperty("openejb.home", home.getDirectory().getCanonicalPath());
this.internalProperties.setProperty("openejb.base", base.getDirectory().getCanonicalPath());
System.setProperty("derby.system.home", System.getProperty("derby.system.home", base.getDirectory().getCanonicalPath()));
}
public E fireEvent(final E event) {
return observerManager.fireEvent(event);
}
public boolean addObserver(final Object observer) {
return observerManager.addObserver(observer);
}
public boolean removeObserver(final Object observer) {
return observerManager.removeObserver(observer);
}
public long getStartTime() {
return startTime;
}
public Options getOptions() {
return options;
}
public Properties getProperties() {
return internalProperties;
}
public String getProperty(final String key) {
return internalProperties.getProperty(key);
}
public String getProperty(final String key, final String defaultValue) {
return internalProperties.getProperty(key, defaultValue);
}
public Object setProperty(final String key, final String value) {
return setProperty(key, value, false);
}
/**
* @param key property name
* @param value property value
* @param isExternalProperty should the property be set to System by {@link System#setProperty(String, String)}
* @return property value
*/
public Object setProperty(final String key, final String value, final boolean isExternalProperty) {
if (isExternalProperty) {
this.externalProperties.setProperty(key, value);
System.setProperty(key, value);
}
return internalProperties.setProperty(key, value);
}
public FileUtils getHome() {
if (!isInitialized()) {
return new FileUtils("openejb.home", "user.dir", System.getProperties());
}
return home;
}
public FileUtils getBase() {
if (!isInitialized()) {
return new FileUtils("openejb.base", "openejb.home", System.getProperties());
}
return base;
}
public ClassPath getClassPath() {
return classPath;
}
public ClassLoader getClassLoader() {
return classLoader;
}
/**
* I'm not sure how this will play out, but I've used class instances instead of strings
* for lookups as class instances are classloader scoped and there is an implicit "namespace"
* associated with that. Theoretically, you can't lookup things that you can't already see
* in your classloader.
*
* @param type
* @return the object associated with the class type or null
* @throws IllegalStateException of the component isn't found
*/
public T getComponent(final Class type) {
final T component = (T) components.get(type);
if (component != null) {
return component;
}
final String classname = getProperty(type.getName());
if (classname != null) {
try {
final T instance = type.cast(Thread.currentThread().getContextClassLoader()
.loadClass(classname).newInstance());
components.put(type, instance);
return instance;
} catch (final Exception e) {
// no-op
}
}
return null;
}
public T removeComponent(final Class type) {
final T component = (T) components.remove(type);
if (component != null) {
fireEvent(new ComponentRemoved(type, component));
}
return component;
}
/**
* @param type the class type of the component required
*/
public T setComponent(final Class type, final T value) {
final T removed = (T) components.put(type, value);
if (removed != null) {
fireEvent(new ComponentRemoved(type, value));
}
if (value != null) {
fireEvent(new ComponentAdded(type, value));
}
return removed;
}
private static SystemInstance system;
static {
reset();
}
private static boolean initialized;
public static boolean isInitialized() {
return initialized;
}
public static synchronized void reset() {
try {
System.clearProperty("openejb.loader");
system = new SystemInstance(new Properties()); // don't put system properties here, it is already done
initialized = false;
} catch (final Exception e) {
throw new LoaderRuntimeException("Failed to create default instance of SystemInstance", e);
}
}
public static synchronized void init(final Properties properties) throws Exception {
if (initialized) {
return;
}
system = new SystemInstance(properties);
// WARNING: reverse order since we don't overwrite existing entries
readSystemProperties(get().currentProfile());
readSystemProperties();
readUserSystemProperties();
// if the user read System.getProperties() instead of our properties, used in bval-tomee tck for instance
System.getProperties().putAll(system.getProperties());
initialized = true;
get().setProperty("openejb.profile.custom", Boolean.toString(!get().isDefaultProfile()));
}
private static void readUserSystemProperties() {
final File file = new File(System.getProperty("user.home"), ".openejb/system.properties");
addSystemProperties(file);
}
public File getConf(final String subPath) {
File conf = null;
try {
conf = system.getBase().getDirectory("conf");
} catch (final IOException e) {
// no-op
}
if (conf == null || !conf.exists()) {
try {
conf = system.getBase().getDirectory("etc");
} catch (final IOException e) {
// no-op
}
}
if (conf == null || !conf.exists()) {
return new File(system.getBase().getDirectory(), "conf");
}
if (subPath == null) {
return conf;
}
return new File(conf, subPath);
}
private static void readSystemProperties(final String prefix) {
final String completePrefix;
if (prefix != null && !prefix.isEmpty()) {
completePrefix = prefix + ".";
} else {
completePrefix = "";
}
// Read in and apply the conf/system.properties
final File conf = system.getConf(completePrefix + "system.properties");
if (conf != null && conf.exists()) {
addSystemProperties(conf);
}
}
private static void readSystemProperties() {
readSystemProperties(null);
}
private static void addSystemProperties(final File file) {
if (!file.exists()) {
return;
}
final Properties systemProperties;
try {
systemProperties = IO.readProperties(file);
} catch (final IOException e) {
return;
}
for (final String key : systemProperties.stringPropertyNames()) {
if (system.getProperty(key) == null) {
system.setProperty(key, systemProperties.getProperty(key));
}
}
// don't override system props
// system.getProperties().putAll(systemProperties);
}
public static SystemInstance get() {
return system;
}
public String currentProfile() {
return getProperty(PROFILE_PROP, DEFAULT_PROFILE);
}
public boolean isDefaultProfile() {
return DEFAULT_PROFILE.equals(currentProfile());
}
/**
* @param propName property name
* @return true when property is set; false otherwise
*/
public boolean hasProperty(final String propName) {
return this.internalProperties.get(propName) != null;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy