/**
* Constructor. Initialises the servlet, reading the ontology model from static files and creating
* a cleaner thread that removes obsolete sessions.
*/
public LiberServletImpl() {
System.out.println("Starting up");
try {
ontology = new OntologyReader(); // reads PolicyGrid ontologies
// ontology = new GeographyOntologyReader(); //reads geography ontology
clean =
new TimerTask() {
public void run() { // Removes obsolete sessions from the map, running every 10 min.
long time = new GregorianCalendar().getTimeInMillis();
synchronized (userMap) {
Iterator it = userMap.keySet().iterator();
List<String> obsolete = new ArrayList<String>();
while (it.hasNext()) {
String key = (String) it.next();
long timeDif = time - userMap.get(key).getLastUpdated();
if ((timeDif < 0)
|| (timeDif > 3600000)) // if an hour has lapsed, or the next day has started
obsolete.add(key); // (let's just hope no-one starts using the tool at midnight)
}
for (int i = 0; i < obsolete.size(); i++) // then remove that session
userMap.remove(obsolete.get(i));
}
}
};
Timer timer = new Timer();
timer.schedule(clean, 0, 600000);
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
} catch (Exception e) {
e.printStackTrace();
}
}
private static void _runGc() {
long usedMem1 = usedMemory();
long usedMem2 = Long.MAX_VALUE;
for (int i = 0; usedMem1 < usedMem2 && i < 500; i++) {
runtime.runFinalization();
runtime.gc();
Thread.currentThread().yield();
usedMem2 = usedMem1;
usedMem1 = usedMemory();
}
}
/**
* Creates a new session for the editing tool.
*
* @param user user id
* @param project Project ID
* @param resource Resource ID
* @return String[] with user id and name
*/
public String[] newSession(String user, String project, String resource) {
try {
LiberSession session = new LiberSession(ontology, user, project, resource, LiberSession.EDIT);
userMap.put(user, session);
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
return session.getUserDetails();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* Called when the users asks to show or hide all known information about a certain object from
* the database.
*
* @param user User ID
* @param anchor Unique ID of Anchor
* @param show If true, show more information, if false, hide information
* @param type Session type (edit, query, browse)
* @param key browsing session id (null if session type is EDIT)
* @return AnchorInfo[] with serialisable version of feedback text, empty if the user's session is
* expired or null if an error occurred
*/
public AnchorInfo[] changeTextContent(
String user, String anchor, boolean show, int type, String key) {
if (!userMap.containsKey(user)) return new AnchorInfo[0];
LiberSession session = userMap.get(user);
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
synchronized (session) {
session.setLastUpdated();
return session.changeTextContent(anchor, show, type, key);
}
}
private void gc() {
Runtime rt = Runtime.getRuntime();
for (int i = 0; i < 3; i++) {
try {
allocateMemory(1000000);
} catch (Throwable th) {
}
for (int j = 0; j < 3; j++) rt.gc();
}
rt.runFinalization();
try {
Thread.sleep(50);
} catch (Throwable th) { //
}
}
/**
* Ends this particular session. If it's a browsing session, the browsing generator is removed;
* otherwise, the entire user's session can be removed.
*
* @param user user id
* @param type type of session
* @param key browsing session id (null if session type is EDIT)
*/
public void endSession(String user, int type, String key) {
if (!userMap.containsKey(user)) return;
if (type == LiberSession.BROWSE) {
LiberSession session = userMap.get(user);
synchronized (session) {
session.removeBrowsingGenerator(key);
}
} else {
if (type == LiberSession.QUERY) userMap.get(user).printQueryTimes();
userMap.remove(user);
}
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
}
/**
* Initialises a new editing session.
*
* @param user user id
* @param data Data provided about resource
* @return AnchorInfo[] containing the feedback text.
*/
public AnchorInfo[] initSession(String user, InstanceData data) {
try {
LiberSession session = userMap.get(user);
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
synchronized (session) {
session.setLastUpdated();
return session.init(data); // initialise the session and return the text
}
} catch (Exception e) {
e.printStackTrace();
return new AnchorInfo[0];
}
}
protected static long runGCUsedMemory() {
Runtime runtime = Runtime.getRuntime();
long usedMem1 = runtime.totalMemory() - runtime.freeMemory();
long usedMem2 = Long.MAX_VALUE;
int cnt = 4;
while (cnt-- >= 0) {
for (int i = 0; (usedMem1 < usedMem2) && (i < 1000); ++i) {
// AVIAN FIXME
runtime.runFinalization();
runtime.gc();
Thread.yield();
usedMem2 = usedMem1;
usedMem1 = runtime.totalMemory() - runtime.freeMemory();
}
}
return usedMem1;
}
/**
* Initialises a new query session, and returns the class hierarchy. This hierarchy is special
* because it includes the number of instances of each type.
*
* @param user user id
* @param roots root classes of the hierarchy (null to get complete hierarchy)
* @return Hierarchy[] containing class hierarchy
*/
public Hierarchy[] initSessionAndGetClassHierarchy(String user, String[] roots) {
try {
if (userMap.containsKey(user)) userMap.get(user).setLastUpdated();
else userMap.put(user, new LiberSession(ontology, user, null, null, LiberSession.QUERY));
LiberSession session = userMap.get(user);
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
synchronized (session) {
return session.getCountedClassHierarchy(roots);
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static void main(String[] args) {
Runtime rt = Runtime.getRuntime();
long mem = rt.freeMemory();
System.out.println(mem);
String[] test = new String[10000];
for (int i = 0; i < 10000; i++) {
test[i] = new String("test");
}
mem = rt.freeMemory();
System.out.println(mem);
rt.runFinalization();
rt.gc();
mem = rt.freeMemory();
System.out.println(mem);
}
public static void fullGC(boolean verbose) {
if (verbose)
System.out.print(
new Date().toString()
+ ' '
+ String.valueOf((RUNTIME.totalMemory() - RUNTIME.freeMemory()) / 1024L)
+ "Kb used");
long isFree = RUNTIME.freeMemory();
long wasFree;
do {
wasFree = isFree;
RUNTIME.runFinalization();
RUNTIME.gc();
isFree = RUNTIME.freeMemory();
} while (isFree > wasFree);
if (verbose)
System.out.println(
" --> "
+ String.valueOf((RUNTIME.totalMemory() - RUNTIME.freeMemory()) / 1024L)
+ "Kb used");
}
/**
* Initialises a new browsing session, creating a new session for this user.
*
* @param user user id
* @param resource Resource id
* @param type Type of session (edit, query, browse)
* @return AnchorInfo[] containing the feedback text.
*/
public AnchorInfo[] initSession(String user, String resource, int type) {
try {
if (type == LiberSession.BROWSE) // make a new user session if this is the browse tab
userMap.put(
user, new LiberSession(ontology, user, null, resource.replaceAll("\"", ""), type));
else if (!userMap.containsKey(user)) return null;
LiberSession session = userMap.get(user);
Runtime r = Runtime.getRuntime();
r.gc(); // FORCES GARBAGE COLLECTION
r.runFinalization();
synchronized (session) {
session.setLastUpdated();
return session.init(
resource.replaceAll("\"", "")); // initialise the session and return the text
}
} catch (Exception e) {
e.printStackTrace();
return new AnchorInfo[0];
}
}
/**
* 'Suggest' to run the garbage collector. Note this does not call the garbage collector
* synchronously.
*/
public static void gc() {
rt.runFinalization();
rt.gc();
}
/**
* Creates a new AboutDialog object. The icon displayed in this dialog box is provided by the
* parent shell. It should be either a unique image (Shell.getImage()), or the second image of a
* list of (Shell.getImages()[1]).
*
* @param parent The parent shell (also carry the icon to display).
* @param caption Caption text.
* @param description Text for the application description line.
* @param version Text for the application version line.
*/
public AboutDialog(Shell parent, String caption, String description, String version) {
// Take the opportunity to do some clean up if possible
Runtime rt = Runtime.getRuntime();
rt.runFinalization();
rt.gc();
shell = new Shell(parent, SWT.CLOSE | SWT.TITLE | SWT.RESIZE | SWT.APPLICATION_MODAL);
shell.setText(caption);
UIUtil.inheritIcon(shell, parent);
shell.setLayout(new GridLayout());
Composite cmpTmp = new Composite(shell, SWT.BORDER);
cmpTmp.setLayoutData(new GridData(GridData.FILL_BOTH));
GridLayout layTmp = new GridLayout(2, false);
cmpTmp.setLayout(layTmp);
// Application icon
Label appIcon = new Label(cmpTmp, SWT.NONE);
GridData gdTmp = new GridData();
gdTmp.verticalSpan = 2;
appIcon.setLayoutData(gdTmp);
Image[] list = parent.getImages();
// Gets the single icon
if ((list == null) || (list.length < 2)) {
appIcon.setImage(parent.getImage());
} else { // Or the second one if there are more than one.
appIcon.setImage(list[1]);
}
Label label = new Label(cmpTmp, SWT.NONE);
label.setText(description == null ? "TBD" : description); // $NON-NLS-1$
gdTmp =
new GridData(
GridData.HORIZONTAL_ALIGN_CENTER
| GridData.GRAB_HORIZONTAL
| GridData.VERTICAL_ALIGN_CENTER
| GridData.GRAB_VERTICAL);
label.setLayoutData(gdTmp);
label = new Label(cmpTmp, SWT.NONE);
label.setText(
String.format(
Res.getString("AboutDialog.versionLabel"),
version == null ? "TBD" : version)); // $NON-NLS-1$
gdTmp =
new GridData(
GridData.HORIZONTAL_ALIGN_CENTER
| GridData.GRAB_HORIZONTAL
| GridData.VERTICAL_ALIGN_CENTER
| GridData.GRAB_VERTICAL);
label.setLayoutData(gdTmp);
// Info
cmpTmp = new Composite(shell, SWT.BORDER);
cmpTmp.setLayoutData(new GridData(GridData.FILL_BOTH));
layTmp = new GridLayout(2, false);
cmpTmp.setLayout(layTmp);
label = new Label(cmpTmp, SWT.NONE);
label.setText(Res.getString("AboutDialog.jvmVersion")); // $NON-NLS-1$
label = new Label(cmpTmp, SWT.NONE);
label.setText(System.getProperty("java.version")); // $NON-NLS-1$
label = new Label(cmpTmp, SWT.NONE);
label.setText(Res.getString("AboutDialog.platform")); // $NON-NLS-1$
label = new Label(cmpTmp, SWT.NONE);
label.setText(
String.format(
"%s, %s, %s", //$NON-NLS-1$
System.getProperty("os.name"), // $NON-NLS-1$
System.getProperty("os.arch"), // $NON-NLS-1$
System.getProperty("os.version"))); // $NON-NLS-1$
label = new Label(cmpTmp, SWT.NONE);
label.setText(Res.getString("AboutDialog.memoryLabel")); // $NON-NLS-1$
label = new Label(cmpTmp, SWT.NONE);
NumberFormat nf = NumberFormat.getInstance();
label.setText(
String.format(
Res.getString("AboutDialog.memory"), // $NON-NLS-1$
nf.format(rt.freeMemory() / 1024),
nf.format(rt.totalMemory() / 1024)));
// --- Dialog-level buttons
SelectionAdapter CloseActions =
new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
shell.close();
};
};
ClosePanel pnlActions = new ClosePanel(shell, SWT.NONE, CloseActions, false);
pnlActions.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
shell.setDefaultButton(pnlActions.btClose);
shell.pack();
shell.setMinimumSize(shell.getSize());
Point startSize = shell.getMinimumSize();
if (startSize.x < 350) startSize.x = 350;
shell.setSize(startSize);
Dialogs.centerWindow(shell, parent);
}
public static void runGC() {
Runtime r = Runtime.getRuntime();
r.runFinalization();
r.gc();
}
