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- /*
- @ITMillApache2LicenseForJavaFiles@
- */
- package com.vaadin.terminal.gwt.server;
-
- import java.io.PrintWriter;
- import java.io.Serializable;
- import java.io.StringWriter;
- import java.net.URL;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.HashSet;
- import java.util.LinkedList;
-
- import javax.servlet.http.HttpSessionBindingEvent;
- import javax.servlet.http.HttpSessionBindingListener;
-
- import com.vaadin.Application;
- import com.vaadin.service.ApplicationContext;
- import com.vaadin.terminal.ApplicationResource;
-
- /**
- * Base class for web application contexts (including portlet contexts) that
- * handles the common tasks.
- */
- public abstract class AbstractWebApplicationContext implements
- ApplicationContext, HttpSessionBindingListener, Serializable {
-
- protected Collection<TransactionListener> listeners = Collections
- .synchronizedList(new LinkedList<TransactionListener>());
-
- protected final HashSet<Application> applications = new HashSet<Application>();
-
- protected WebBrowser browser = new WebBrowser();
-
- protected HashMap<Application, AbstractCommunicationManager> applicationToAjaxAppMgrMap = new HashMap<Application, AbstractCommunicationManager>();
-
- public void addTransactionListener(TransactionListener listener) {
- if (listener != null) {
- listeners.add(listener);
- }
- }
-
- public void removeTransactionListener(TransactionListener listener) {
- listeners.remove(listener);
- }
-
- /**
- * Sends a notification that a transaction is starting.
- *
- * @param application
- * The application associated with the transaction.
- * @param request
- * the HTTP or portlet request that triggered the transaction.
- */
- protected void startTransaction(Application application, Object request) {
- synchronized (listeners) {
- for (TransactionListener listener : listeners) {
- listener.transactionStart(application, request);
- }
- }
- }
-
- /**
- * Sends a notification that a transaction has ended.
- *
- * @param application
- * The application associated with the transaction.
- * @param request
- * the HTTP or portlet request that triggered the transaction.
- */
- protected void endTransaction(Application application, Object request) {
- LinkedList<Exception> exceptions = null;
-
- synchronized (listeners) {
- for (TransactionListener listener : listeners) {
- try {
- listener.transactionEnd(application, request);
- } catch (final RuntimeException t) {
- if (exceptions == null) {
- exceptions = new LinkedList<Exception>();
- }
- exceptions.add(t);
- }
- }
- }
-
- // If any runtime exceptions occurred, throw a combined exception
- if (exceptions != null) {
- final StringBuffer msg = new StringBuffer();
- for (Exception e : exceptions) {
- 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());
- }
- }
-
- /**
- * @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 = applications.iterator().next();
- app.close();
- 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;
- }
-
- public Collection<Application> getApplications() {
- return Collections.unmodifiableCollection(applications);
- }
-
- protected void removeApplication(Application application) {
- applications.remove(application);
- applicationToAjaxAppMgrMap.remove(application);
- }
-
- public String generateApplicationResourceURL(ApplicationResource resource,
- String mapKey) {
-
- final String filename = resource.getFilename();
- if (filename == null) {
- return "APP/" + mapKey + "/";
- } else {
- return "APP/" + mapKey + "/" + filename;
- }
-
- }
-
- public boolean isApplicationResourceURL(URL context, String relativeUri) {
- // If the relative uri is null, we are ready
- if (relativeUri == null) {
- return false;
- }
-
- // Resolves the prefix
- String prefix = relativeUri;
- final int index = relativeUri.indexOf('/');
- if (index >= 0) {
- prefix = relativeUri.substring(0, index);
- }
-
- // Handles the resource requests
- return (prefix.equals("APP"));
- }
-
- public String getURLKey(URL context, String relativeUri) {
- final int index = relativeUri.indexOf('/');
- final int next = relativeUri.indexOf('/', index + 1);
- if (next < 0) {
- return null;
- }
- return relativeUri.substring(index + 1, next);
- }
-
- }
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