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/* Licensed 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.flowable.app.engine;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.flowable.common.engine.api.FlowableException;
import org.flowable.common.engine.impl.EngineInfo;
import org.flowable.common.engine.impl.util.ReflectUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class AppEngines {
private static final Logger LOGGER = LoggerFactory.getLogger(AppEngines.class);
public static final String NAME_DEFAULT = "default";
protected static boolean isInitialized;
protected static Map appEngines = new HashMap<>();
protected static Map appEngineInfosByName = new HashMap<>();
protected static Map appEngineInfosByResourceUrl = new HashMap<>();
protected static List appEngineInfos = new ArrayList<>();
/**
* Initializes all App engines that can be found on the classpath for resources flowable.app.cfg.xml and for resources flowable-app-context.xml (Spring style
* configuration).
*/
public static synchronized void init() {
if (!isInitialized()) {
if (appEngines == null) {
// Create new map to store CMMN engines if current map is null
appEngines = new HashMap<>();
}
ClassLoader classLoader = AppEngines.class.getClassLoader();
Enumeration resources = null;
try {
resources = classLoader.getResources("flowable.app.cfg.xml");
} catch (IOException e) {
throw new FlowableException("problem retrieving flowable.cmmn.cfg.xml resources on the classpath: " + System.getProperty("java.class.path"), e);
}
// Remove duplicated configuration URL's using set. Some
// classloaders may return identical URL's twice, causing duplicate startups
Set configUrls = new HashSet<>();
while (resources.hasMoreElements()) {
configUrls.add(resources.nextElement());
}
for (Iterator iterator = configUrls.iterator(); iterator.hasNext();) {
URL resource = iterator.next();
LOGGER.info("Initializing app engine using configuration '{}'", resource);
initAppEngineFromResource(resource);
}
try {
resources = classLoader.getResources("flowable-app-context.xml");
} catch (IOException e) {
throw new FlowableException("problem retrieving flowable-app-context.xml resources on the classpath: " + System.getProperty("java.class.path"), e);
}
while (resources.hasMoreElements()) {
URL resource = resources.nextElement();
LOGGER.info("Initializing app engine using Spring configuration '{}'", resource);
initAppEngineFromSpringResource(resource);
}
setInitialized(true);
} else {
LOGGER.info("App engines already initialized");
}
}
protected static void initAppEngineFromSpringResource(URL resource) {
try {
Class springConfigurationHelperClass = ReflectUtil.loadClass("org.flowable.app.spring.SpringAppConfigurationHelper");
Method method = springConfigurationHelperClass.getDeclaredMethod("buildAppEngine", new Class[] { URL.class });
AppEngine appEngine = (AppEngine) method.invoke(null, new Object[] { resource });
String appEngineName = appEngine.getName();
EngineInfo appEngineInfo = new EngineInfo(appEngineName, resource.toString(), null);
appEngineInfosByName.put(appEngineName, appEngineInfo);
appEngineInfosByResourceUrl.put(resource.toString(), appEngineInfo);
} catch (Exception e) {
throw new FlowableException("couldn't initialize app engine from spring configuration resource " + resource + ": " + e.getMessage(), e);
}
}
/**
* Registers the given app engine. No {@link EngineInfo} will be available for this app engine. An engine that is registered will be closed when the {@link AppEngines#destroy()} is called.
*/
public static void registerAppEngine(AppEngine appEngine) {
appEngines.put(appEngine.getName(), appEngine);
}
/**
* Unregisters the given app engine.
*/
public static void unregister(AppEngine appEngine) {
appEngines.remove(appEngine.getName());
}
private static EngineInfo initAppEngineFromResource(URL resourceUrl) {
EngineInfo appEngineInfo = appEngineInfosByResourceUrl.get(resourceUrl.toString());
// if there is an existing app engine info
if (appEngineInfo != null) {
// remove that app engine from the member fields
appEngineInfos.remove(appEngineInfo);
if (appEngineInfo.getException() == null) {
String appEngineName = appEngineInfo.getName();
appEngines.remove(appEngineName);
appEngineInfosByName.remove(appEngineName);
}
appEngineInfosByResourceUrl.remove(appEngineInfo.getResourceUrl());
}
String resourceUrlString = resourceUrl.toString();
try {
LOGGER.info("initializing app engine for resource {}", resourceUrl);
AppEngine appEngine = buildAppEngine(resourceUrl);
String appEngineName = appEngine.getName();
LOGGER.info("initialised app engine {}", appEngineName);
appEngineInfo = new EngineInfo(appEngineName, resourceUrlString, null);
appEngines.put(appEngineName, appEngine);
appEngineInfosByName.put(appEngineName, appEngineInfo);
} catch (Throwable e) {
LOGGER.error("Exception while initializing app engine: {}", e.getMessage(), e);
appEngineInfo = new EngineInfo(null, resourceUrlString, ExceptionUtils.getStackTrace(e));
}
appEngineInfosByResourceUrl.put(resourceUrlString, appEngineInfo);
appEngineInfos.add(appEngineInfo);
return appEngineInfo;
}
protected static AppEngine buildAppEngine(URL resource) {
try (InputStream inputStream = resource.openStream()) {
AppEngineConfiguration appEngineConfiguration = AppEngineConfiguration.createAppEngineConfigurationFromInputStream(inputStream);
return appEngineConfiguration.buildAppEngine();
} catch (IOException e) {
throw new FlowableException("couldn't open resource stream: " + e.getMessage(), e);
}
}
/** Get initialization results. */
public static List getAppEngineInfos() {
return appEngineInfos;
}
/**
* Get initialization results. Only info will we available for app engines which were added in the {@link AppEngines#init()}. No {@link EngineInfo} is available for engines which were registered
* programmatically.
*/
public static EngineInfo getAppEngineInfo(String appEngineName) {
return appEngineInfosByName.get(appEngineName);
}
public static AppEngine getDefaultAppEngine() {
return getAppEngine(NAME_DEFAULT);
}
/**
* Obtain an app engine by name.
*
* @param appEngineName
* is the name of the app engine or null for the default app engine.
*/
public static AppEngine getAppEngine(String appEngineName) {
if (!isInitialized()) {
init();
}
return appEngines.get(appEngineName);
}
/**
* retries to initialize an app engine that previously failed.
*/
public static EngineInfo retry(String resourceUrl) {
LOGGER.debug("retying initializing of resource {}", resourceUrl);
try {
return initAppEngineFromResource(new URL(resourceUrl));
} catch (MalformedURLException e) {
throw new FlowableException("invalid url: " + resourceUrl, e);
}
}
/**
* provides access to app engine to application clients in a managed server environment.
*/
public static Map getAppEngines() {
return appEngines;
}
/**
* closes all app engines. This method should be called when the server shuts down.
*/
public static synchronized void destroy() {
if (isInitialized()) {
Map engines = new HashMap<>(appEngines);
appEngines = new HashMap<>();
for (String appEngineName : engines.keySet()) {
AppEngine appEngine = engines.get(appEngineName);
try {
appEngine.close();
} catch (Exception e) {
LOGGER.error("exception while closing {}", (appEngineName == null ? "the default app engine" : "app engine " + appEngineName), e);
}
}
appEngineInfosByName.clear();
appEngineInfosByResourceUrl.clear();
appEngineInfos.clear();
setInitialized(false);
}
}
public static boolean isInitialized() {
return isInitialized;
}
public static void setInitialized(boolean isInitialized) {
AppEngines.isInitialized = isInitialized;
}
}
