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Added comments to WindowsShutdownManagerImpl.

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This commit is contained in:
akwizgran
2011-11-19 16:49:04 +01:00
parent bb4c79322e
commit 8d74a02ad9
1 changed files with 10 additions and 5 deletions
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15
components/net/sf/briar/lifecycle/WindowsShutdownManagerImpl.java
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@@ -29,7 +29,6 @@ class WindowsShutdownManagerImpl extends ShutdownManagerImpl {
Logger.getLogger(WindowsShutdownManagerImpl.class.getName());
private static final int WM_QUERYENDSESSION = 17;
private static final int WM_ENDSESSION = 22;
private static final int GWL_WNDPROC = -4;
private static final int WS_MINIMIZE = 0x20000000;
@@ -38,6 +37,7 @@ class WindowsShutdownManagerImpl extends ShutdownManagerImpl {
private boolean initialised = false; // Locking: this
WindowsShutdownManagerImpl() {
// Use the Unicode versions of Win32 API calls
options = new TreeMap<String, Object>();
options.put(Library.OPTION_TYPE_MAPPER, W32APITypeMapper.UNICODE);
options.put(Library.OPTION_FUNCTION_MAPPER,
@@ -80,33 +80,37 @@ class WindowsShutdownManagerImpl extends ShutdownManagerImpl {
@Override
public void run() {
try {
// Load user32.dll
final User32 user32 = (User32) Native.loadLibrary("user32",
User32.class, options);
// Create a callback to handle the WM_QUERYENDSESSION message
WindowProc proc = new WindowProc() {
public LRESULT callback(HWND hwnd, int msg, WPARAM wp,
LPARAM lp) {
if(msg == WM_QUERYENDSESSION) {
// It's safe to delay returning from this message
runShutdownHooks();
} else if(msg == WM_ENDSESSION) {
// Return immediately or the JVM crashes on return
}
// Pass the message to the default window procedure
return user32.DefWindowProc(hwnd, msg, wp, lp);
}
};
// Create a native window
HWND hwnd = user32.CreateWindowEx(0, "STATIC", "", WS_MINIMIZE,
0, 0, 0, 0, null, null, null, null);
// Register the callback
try {
// Use SetWindowLongPtr if available (64-bit safe)
user32.SetWindowLongPtr(hwnd, GWL_WNDPROC, proc);
if(LOG.isLoggable(Level.INFO))
LOG.info("Registered 64-bit callback");
} catch(UnsatisfiedLinkError e) {
// Use SetWindowLong if SetWindowLongPtr isn't available
user32.SetWindowLong(hwnd, GWL_WNDPROC, proc);
if(LOG.isLoggable(Level.INFO))
LOG.info("Registered 32-bit callback");
}
// Handle events until the window is destroyed
MSG msg = new MSG();
while(user32.GetMessage(msg, null, 0, 0) > 0) {
user32.TranslateMessage(msg);
@@ -128,6 +132,7 @@ class WindowsShutdownManagerImpl extends ShutdownManagerImpl {
}
public void run() {
// Ensure the runnable only runs once
if(called.getAndSet(true)) return;
runnable.run();
}