io.undertow.servlet.core.ManagedServlet Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.servlet.core;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import javax.servlet.MultipartConfigElement;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.SingleThreadModel;
import javax.servlet.UnavailableException;
import io.undertow.server.handlers.form.FormEncodedDataDefinition;
import io.undertow.server.handlers.form.FormParserFactory;
import io.undertow.server.handlers.form.MultiPartParserDefinition;
import io.undertow.server.handlers.resource.ResourceChangeListener;
import io.undertow.server.handlers.resource.ResourceManager;
import io.undertow.servlet.UndertowServletLogger;
import io.undertow.servlet.UndertowServletMessages;
import io.undertow.servlet.api.DeploymentManager;
import io.undertow.servlet.api.InstanceFactory;
import io.undertow.servlet.api.InstanceHandle;
import io.undertow.servlet.api.LifecycleInterceptor;
import io.undertow.servlet.api.ServletInfo;
import io.undertow.servlet.spec.ServletConfigImpl;
import io.undertow.servlet.spec.ServletContextImpl;
/**
* Manager for a servlets lifecycle.
*
* @author Stuart Douglas
*/
public class ManagedServlet implements Lifecycle {
private final ServletInfo servletInfo;
private final ServletContextImpl servletContext;
private volatile boolean started = false;
private final InstanceStrategy instanceStrategy;
private volatile boolean permanentlyUnavailable = false;
private long maxRequestSize;
private FormParserFactory formParserFactory;
private MultipartConfigElement multipartConfig;
public ManagedServlet(final ServletInfo servletInfo, final ServletContextImpl servletContext) {
this.servletInfo = servletInfo;
this.servletContext = servletContext;
if (SingleThreadModel.class.isAssignableFrom(servletInfo.getServletClass())) {
instanceStrategy = new SingleThreadModelPoolStrategy(servletInfo.getInstanceFactory(), servletInfo, servletContext);
} else {
instanceStrategy = new DefaultInstanceStrategy(servletInfo.getInstanceFactory(), servletInfo, servletContext);
}
setupMultipart(servletContext);
}
public void setupMultipart(ServletContextImpl servletContext) {
FormEncodedDataDefinition formDataParser = new FormEncodedDataDefinition()
.setDefaultEncoding(servletContext.getDeployment().getDefaultCharset().name());
MultipartConfigElement multipartConfig = servletInfo.getMultipartConfig();
if(multipartConfig == null) {
multipartConfig = servletContext.getDeployment().getDeploymentInfo().getDefaultMultipartConfig();
}
this.multipartConfig = multipartConfig;
if (multipartConfig != null) {
//todo: fileSizeThreshold
MultipartConfigElement config = multipartConfig;
if (config.getMaxRequestSize() != -1) {
maxRequestSize = config.getMaxRequestSize();
} else {
maxRequestSize = -1;
}
final Path tempDir;
if(config.getLocation() == null || config.getLocation().isEmpty()) {
tempDir = servletContext.getDeployment().getDeploymentInfo().getTempPath();
} else {
String location = config.getLocation();
Path locFile = Paths.get(location);
if(locFile.isAbsolute()) {
tempDir = locFile;
} else {
tempDir = servletContext.getDeployment().getDeploymentInfo().getTempPath().resolve(location);
}
}
MultiPartParserDefinition multiPartParserDefinition = new MultiPartParserDefinition(tempDir);
if(config.getMaxFileSize() > 0) {
multiPartParserDefinition.setMaxIndividualFileSize(config.getMaxFileSize());
}
multiPartParserDefinition.setDefaultEncoding(servletContext.getDeployment().getDefaultCharset().name());
formParserFactory = FormParserFactory.builder(false)
.addParser(formDataParser)
.addParser(multiPartParserDefinition)
.build();
} else {
//no multipart config we don't allow multipart requests
formParserFactory = FormParserFactory.builder(false).addParser(formDataParser).build();
maxRequestSize = -1;
}
}
public synchronized void start() throws ServletException {
}
public void createServlet() throws ServletException {
if (permanentlyUnavailable) {
return;
}
try {
if (!started && servletInfo.getLoadOnStartup() != null && servletInfo.getLoadOnStartup() >= 0) {
instanceStrategy.start();
started = true;
}
} catch (UnavailableException e) {
if (e.isPermanent()) {
permanentlyUnavailable = true;
stop();
}
}
}
public synchronized void stop() {
if (started) {
instanceStrategy.stop();
}
started = false;
}
@Override
public boolean isStarted() {
return started;
}
public boolean isPermanentlyUnavailable() {
return permanentlyUnavailable;
}
public void setPermanentlyUnavailable(final boolean permanentlyUnavailable) {
this.permanentlyUnavailable = permanentlyUnavailable;
}
public InstanceHandle getServlet() throws ServletException {
if(servletContext.getDeployment().getDeploymentState() != DeploymentManager.State.STARTED) {
throw UndertowServletMessages.MESSAGES.deploymentStopped(servletContext.getDeployment().getDeploymentInfo().getDeploymentName());
}
if (!started) {
synchronized (this) {
if (!started) {
instanceStrategy.start();
started = true;
}
}
}
return instanceStrategy.getServlet();
}
public ServletInfo getServletInfo() {
return servletInfo;
}
public long getMaxRequestSize() {
return maxRequestSize;
}
public FormParserFactory getFormParserFactory() {
return formParserFactory;
}
public MultipartConfigElement getMultipartConfig() {
return multipartConfig;
}
@Override
public String toString() {
return "ManagedServlet{" +
"servletInfo=" + servletInfo +
'}';
}
/**
* interface used to abstract the difference between single thread model servlets and normal servlets
*/
interface InstanceStrategy {
void start() throws ServletException;
void stop();
InstanceHandle getServlet() throws ServletException;
}
/**
* The default servlet pooling strategy that just uses a single instance for all requests
*/
private static class DefaultInstanceStrategy implements InstanceStrategy {
private final InstanceFactory factory;
private final ServletInfo servletInfo;
private final ServletContextImpl servletContext;
private volatile InstanceHandle handle;
private volatile Servlet instance;
private ResourceChangeListener changeListener;
private final InstanceHandle instanceHandle = new InstanceHandle() {
@Override
public Servlet getInstance() {
return instance;
}
@Override
public void release() {
}
};
DefaultInstanceStrategy(final InstanceFactory factory, final ServletInfo servletInfo, final ServletContextImpl servletContext) {
this.factory = factory;
this.servletInfo = servletInfo;
this.servletContext = servletContext;
}
public synchronized void start() throws ServletException {
try {
handle = factory.createInstance();
} catch (Exception e) {
throw UndertowServletMessages.MESSAGES.couldNotInstantiateComponent(servletInfo.getName(), e);
}
instance = handle.getInstance();
new LifecyleInterceptorInvocation(servletContext.getDeployment().getDeploymentInfo().getLifecycleInterceptors(), servletInfo, instance, new ServletConfigImpl(servletInfo, servletContext)).proceed();
//if a servlet implements FileChangeCallback it will be notified of file change events
final ResourceManager resourceManager = servletContext.getDeployment().getDeploymentInfo().getResourceManager();
if(instance instanceof ResourceChangeListener && resourceManager.isResourceChangeListenerSupported()) {
resourceManager.registerResourceChangeListener(changeListener = (ResourceChangeListener) instance);
}
}
public synchronized void stop() {
if (handle != null) {
final ResourceManager resourceManager = servletContext.getDeployment().getDeploymentInfo().getResourceManager();
if(changeListener != null) {
resourceManager.removeResourceChangeListener(changeListener);
}
invokeDestroy();
handle.release();
}
}
private void invokeDestroy() {
List interceptors = servletContext.getDeployment().getDeploymentInfo().getLifecycleInterceptors();
try {
new LifecyleInterceptorInvocation(interceptors, servletInfo, instance).proceed();
} catch (Exception e) {
UndertowServletLogger.ROOT_LOGGER.failedToDestroy(servletInfo, e);
}
}
public InstanceHandle getServlet() {
return instanceHandle;
}
}
/**
* pooling strategy for single thread model servlet
*/
private static class SingleThreadModelPoolStrategy implements InstanceStrategy {
private final InstanceFactory factory;
private final ServletInfo servletInfo;
private final ServletContextImpl servletContext;
private SingleThreadModelPoolStrategy(final InstanceFactory factory, final ServletInfo servletInfo, final ServletContextImpl servletContext) {
this.factory = factory;
this.servletInfo = servletInfo;
this.servletContext = servletContext;
}
@Override
public void start() throws ServletException {
if(servletInfo.getLoadOnStartup() != null) {
//see UNDERTOW-734, make sure init method is called for load on startup
getServlet().release();
}
}
@Override
public void stop() {
}
@Override
public InstanceHandle getServlet() throws ServletException {
final InstanceHandle instanceHandle;
final Servlet instance;
//TODO: pooling
try {
instanceHandle = factory.createInstance();
} catch (Exception e) {
throw UndertowServletMessages.MESSAGES.couldNotInstantiateComponent(servletInfo.getName(), e);
}
instance = instanceHandle.getInstance();
new LifecyleInterceptorInvocation(servletContext.getDeployment().getDeploymentInfo().getLifecycleInterceptors(), servletInfo, instance, new ServletConfigImpl(servletInfo, servletContext)).proceed();
return new InstanceHandle() {
@Override
public Servlet getInstance() {
return instance;
}
@Override
public void release() {
instance.destroy();
instanceHandle.release();
}
};
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy