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- /*
- @ITMillApache2LicenseForJavaFiles@
- */
-
- package com.itmill.toolkit.terminal.gwt.server;
-
- import java.io.File;
- import java.io.PrintWriter;
- import java.io.StringWriter;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.HashSet;
- import java.util.Iterator;
- import java.util.LinkedList;
- import java.util.List;
-
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpSession;
- import javax.servlet.http.HttpSessionBindingEvent;
- import javax.servlet.http.HttpSessionBindingListener;
-
- import com.itmill.toolkit.Application;
- import com.itmill.toolkit.service.ApplicationContext;
- import com.itmill.toolkit.terminal.gwt.client.ClientExceptionHandler;
-
- /**
- * Web application context for the IT Mill Toolkit applications.
- *
- * @author IT Mill Ltd.
- * @version
- * @VERSION@
- * @since 3.1
- */
- public class WebApplicationContext implements ApplicationContext,
- HttpSessionBindingListener {
-
- protected List listeners;
-
- protected HttpSession session;
-
- protected final HashSet applications = new HashSet();
-
- protected WebBrowser browser = new WebBrowser();
-
- /**
- * Creates a new Web Application Context.
- *
- */
- WebApplicationContext() {
-
- }
-
- /**
- * Gets the application context base directory.
- *
- * @see com.itmill.toolkit.service.ApplicationContext#getBaseDirectory()
- */
- public File getBaseDirectory() {
- final String realPath = ApplicationServlet.getResourcePath(session
- .getServletContext(), "/");
- if (realPath == null) {
- return null;
- }
- return new File(realPath);
- }
-
- /**
- * Gets the http-session application is running in.
- *
- * @return HttpSession this application context resides in.
- */
- public HttpSession getHttpSession() {
- return session;
- }
-
- /**
- * Gets the applications in this context.
- *
- * @see com.itmill.toolkit.service.ApplicationContext#getApplications()
- */
- public Collection getApplications() {
- return Collections.unmodifiableCollection(applications);
- }
-
- /**
- * Gets the application context for HttpSession.
- *
- * @param session
- * the HTTP session.
- * @return the application context for HttpSession.
- */
- static public WebApplicationContext getApplicationContext(
- HttpSession session) {
- WebApplicationContext cx = (WebApplicationContext) session
- .getAttribute(WebApplicationContext.class.getName());
- if (cx == null) {
- cx = new WebApplicationContext();
- session.setAttribute(WebApplicationContext.class.getName(), cx);
- }
- if (cx.session == null) {
- cx.session = session;
- }
- return cx;
- }
-
- /**
- * Returns <code>true</code> if and only if the argument is not
- * <code>null</code> and is a Boolean object that represents the same
- * boolean value as this object.
- *
- * @param obj
- * the object to compare with.
- * @see java.lang.Object#equals(java.lang.Object)
- */
- public boolean equals(Object obj) {
- return session.equals(obj);
- }
-
- /**
- * Returns the hash code value .
- *
- * @see java.lang.Object#hashCode()
- */
- public int hashCode() {
- return session.hashCode();
- }
-
- /**
- * Adds the transaction listener to this context.
- *
- * @see com.itmill.toolkit.service.ApplicationContext#addTransactionListener(com.itmill.toolkit.service.ApplicationContext.TransactionListener)
- */
- public void addTransactionListener(TransactionListener listener) {
- if (listeners == null) {
- listeners = new LinkedList();
- }
- listeners.add(listener);
- }
-
- /**
- * Removes the transaction listener from this context.
- *
- * @see com.itmill.toolkit.service.ApplicationContext#removeTransactionListener(com.itmill.toolkit.service.ApplicationContext.TransactionListener)
- */
- public void removeTransactionListener(TransactionListener listener) {
- if (listeners != null) {
- listeners.remove(listener);
- }
-
- }
-
- /**
- * Notifies the transaction start.
- *
- * @param application
- * @param request
- * the HTTP request.
- */
- protected void startTransaction(Application application,
- HttpServletRequest request) {
- if (listeners == null) {
- return;
- }
- for (final Iterator i = listeners.iterator(); i.hasNext();) {
- ((ApplicationContext.TransactionListener) i.next())
- .transactionStart(application, request);
- }
- }
-
- /**
- * Notifies the transaction end.
- *
- * @param application
- * @param request
- * the HTTP request.
- */
- protected void endTransaction(Application application,
- HttpServletRequest request) {
- if (listeners == null) {
- return;
- }
-
- LinkedList exceptions = null;
- for (final Iterator i = listeners.iterator(); i.hasNext();) {
- try {
- ((ApplicationContext.TransactionListener) i.next())
- .transactionEnd(application, request);
- } catch (final RuntimeException t) {
- if (exceptions == null) {
- exceptions = new LinkedList();
- }
- exceptions.add(t);
- }
- }
-
- // If any runtime exceptions occurred, throw a combined exception
- if (exceptions != null) {
- final StringBuffer msg = new StringBuffer();
- for (final Iterator i = exceptions.iterator(); i.hasNext();) {
- final RuntimeException e = (RuntimeException) i.next();
- if (msg.length() == 0) {
- msg.append("\n\n--------------------------\n\n");
- }
- msg.append(e.getMessage() + "\n");
- final StringWriter trace = new StringWriter();
- e.printStackTrace(new PrintWriter(trace, true));
- msg.append(trace.toString());
- }
- throw new RuntimeException(msg.toString());
- }
- }
-
- protected void removeApplication(Application application) {
- applications.remove(application);
- }
-
- protected void addApplication(Application application) {
- applications.add(application);
- }
-
- /**
- * @see javax.servlet.http.HttpSessionBindingListener#valueBound(HttpSessionBindingEvent)
- */
- public void valueBound(HttpSessionBindingEvent arg0) {
- // We are not interested in bindings
- }
-
- /**
- * @see javax.servlet.http.HttpSessionBindingListener#valueUnbound(HttpSessionBindingEvent)
- */
- public void valueUnbound(HttpSessionBindingEvent event) {
- // If we are going to be unbound from the session, the session must be
- // closing
- try {
- while (!applications.isEmpty()) {
- final Application app = (Application) applications.iterator()
- .next();
- app.close();
- ApplicationServlet.applicationToAjaxAppMgrMap.remove(app);
- removeApplication(app);
- }
- } catch (Exception e) {
- // This should never happen but is possible with rare
- // configurations (e.g. robustness tests). If you have one
- // thread doing HTTP socket write and another thread trying to
- // remove same application here. Possible if you got e.g. session
- // lifetime 1 min but socket write may take longer than 1 min.
- // FIXME: Handle exception
- System.err.println("Could not remove application, leaking memory.");
- e.printStackTrace();
- }
- }
-
- /**
- * Get the web browser associated with this application context.
- *
- * Because application context is related to the http session and server
- * maintains one session per browser-instance, each context has exactly one
- * web browser associated with it.
- *
- * @return
- */
- public WebBrowser getBrowser() {
- return browser;
- }
- }
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