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Use isolates for directory listing.

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Use isolates to make directory listing asynchroneous from the point
of view of the main Dart isolate. Each listing operation will spawn
a new heavy isolate to perform the actually directory listing using
the synchroneous OS primitives.

R=sgjesse@google.com,iposva@google.com
BUG=
TEST=

Review URL: http://codereview.chromium.org//8232005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@327 260f80e4-7a28-3924-810f-c04153c831b5
This commit is contained in:
ager@google.com 2011-10-11 13:12:14 +00:00
parent d5e6daf99f
commit cf136a7685
2 changed files with 43 additions and 15 deletions
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54
runtime/bin/directory_impl.dart
View file

@ -2,11 +2,39 @@
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
class DirectoryException {
const DirectoryException(String this.message);
final String message;
}
class _DirectoryListingIsolate extends Isolate {
_DirectoryListingIsolate() : super.heavy();
void main() {
port.receive((message, replyTo) {
_list(message['dir'],
message['id'],
message['recursive'],
message['dirHandler'],
message['fileHandler'],
message['doneHandler'],
message['dirErrorHandler']);
});
}
void _list(String dir,
int id,
bool recursive,
ReceivePort dirHandler,
ReceivePort fileHandler,
ReceivePort doneHandler,
ReceivePort dirErrorHandler) native "Directory_List";
}
class _Directory implements Directory {
_Directory.open(String this._dir) {
@ -40,7 +68,6 @@ class _Directory implements Directory {
}
void list([bool recursive = false]) {
// TODO(ager): Spawn an isolate to make the listing an async operation.
if (_closed) {
throw new DirectoryException("Error: directory closed");
}
@ -48,13 +75,17 @@ class _Directory implements Directory {
throw new DirectoryException("Error: listing already in progress");
}
_listing = true;
_list(_dir,
_id,
recursive,
_dirHandler,
_fileHandler,
_doneHandler,
_dirErrorHandler);
new _DirectoryListingIsolate().spawn().then((port) {
// TODO(ager): Do not explicitly transform to send ports when
// that is done automatically.
port.send({ 'dir': _dir,
'id': _id,
'recursive': recursive,
'dirHandler': _dirHandler.toSendPort(),
'fileHandler': _fileHandler.toSendPort(),
'doneHandler': _doneHandler.toSendPort(),
'dirErrorHandler': _dirErrorHandler.toSendPort() });
});
}
// TODO(ager): Implement setting of the handlers as in the process library.
@ -113,13 +144,6 @@ class _Directory implements Directory {
// Native code binding.
bool _open(String dir) native "Directory_Open";
bool _close(int id) native "Directory_Close";
void _list(String dir,
int id,
bool recursive,
ReceivePort dirHandler,
ReceivePort fileHandler,
ReceivePort doneHandler,
ReceivePort dirErrorHandler) native "Directory_List";
ReceivePort _dirHandler;
ReceivePort _fileHandler;

4
runtime/tests/dart/src/DirectoryTest.dart
View file

@ -28,6 +28,10 @@ class DirectoryTest {
});
directory.list();
// Listing is asynchronous, so nothing should be listed at this
// point.
Expect.isFalse(listedSomething);
}
static void testMain() {