Geary no longer spikes to 100% CPU: Closes #6602

Folders can now be FAST_OPEN'd, which is used by the background
account synchronizer to quickly determine what changes have occurred
to a folder and get it up-to-date.  I've used Geary for a few days
with these changes and have seen a dramatic difference in sluggishness.
There are still CPU spikes when background work is detected, but
not like before and not nearly as sustained.
This commit is contained in:
Jim Nelson 2013-05-14 15:36:33 -07:00
parent 94b133dad1
commit 6ce275f61d
14 changed files with 255 additions and 89 deletions

View file

@ -476,7 +476,7 @@ public class GearyController {
update_ui();
current_conversations = new Geary.ConversationMonitor(current_folder, false,
current_conversations = new Geary.ConversationMonitor(current_folder, Geary.Folder.OpenFlags.NONE,
ConversationListStore.REQUIRED_FIELDS);
if (inboxes.values.contains(current_folder)) {
@ -739,7 +739,7 @@ public class GearyController {
main_window.folder_list.select_folder(select_folder);
}
folder.open_async.begin(false, inbox_cancellables.get(folder.account));
folder.open_async.begin(Geary.Folder.OpenFlags.NONE, inbox_cancellables.get(folder.account));
new_messages_monitor.add_folder(folder, inbox_cancellables.get(folder.account));
}

View file

@ -62,7 +62,7 @@ public class Geary.DBus.Controller {
warning("No inbox folder found");
return;
}
yield folder.open_async(false, null);
yield folder.open_async(Geary.Folder.OpenFlags.NONE, null);
conversations = new Geary.DBus.Conversations(folder);

View file

@ -27,8 +27,8 @@ public class Geary.DBus.Conversations : Object {
public Conversations(Geary.Folder folder) {
this.folder = folder;
conversations = new Geary.ConversationMonitor(folder, false, Geary.Email.Field.ENVELOPE |
Geary.Email.Field.FLAGS);
conversations = new Geary.ConversationMonitor(folder, Geary.Folder.OpenFlags.NONE,
Geary.Email.Field.ENVELOPE | Geary.Email.Field.FLAGS);
start_monitoring_async.begin();
}

View file

@ -68,7 +68,8 @@ public abstract class Geary.AbstractFolder : BaseObject, Geary.Folder {
public abstract Geary.Folder.OpenState get_open_state();
public abstract async void open_async(bool readonly, Cancellable? cancellable = null) throws Error;
public abstract async bool open_async(Geary.Folder.OpenFlags open_flags, Cancellable? cancellable = null)
throws Error;
public abstract async void wait_for_open_async(Cancellable? cancellable = null) throws Error;

View file

@ -172,7 +172,7 @@ public class Geary.ConversationMonitor : BaseObject {
public bool is_monitoring { get; private set; default = false; }
private Geary.Email.Field required_fields;
private bool readonly;
private Geary.Folder.OpenFlags open_flags;
private Gee.Set<ImplConversation> conversations = new Gee.HashSet<ImplConversation>();
private Gee.HashMap<Geary.EmailIdentifier, ImplConversation> geary_id_map = new Gee.HashMap<
Geary.EmailIdentifier, ImplConversation>();
@ -307,9 +307,9 @@ public class Geary.ConversationMonitor : BaseObject {
folder.to_string());
}
public ConversationMonitor(Geary.Folder folder, bool readonly, Geary.Email.Field required_fields) {
public ConversationMonitor(Geary.Folder folder, Geary.Folder.OpenFlags open_flags, Geary.Email.Field required_fields) {
this.folder = folder;
this.readonly = readonly;
this.open_flags = open_flags;
this.required_fields = required_fields | REQUIRED_FIELDS;
folder.account.information.notify["imap-credentials"].connect(on_imap_credentials_notified);
@ -402,7 +402,7 @@ public class Geary.ConversationMonitor : BaseObject {
bool reseed_now = (folder.get_open_state() != Geary.Folder.OpenState.CLOSED);
try {
yield folder.open_async(readonly, cancellable);
yield folder.open_async(open_flags, cancellable);
} catch (Error err) {
is_monitoring = false;

View file

@ -49,6 +49,28 @@ public interface Geary.Folder : BaseObject {
REMOVED
}
/**
* Flags describing open modifiers.
*
* * FAST_OPEN: perform the minimal amount of activity possible to open the folder
* and be synchronized with the server. This may mean some attributes of
* the messages (such as their flags or other metadata) may not be up-to-date
* when the folder opens. Not all folders will support this flag.
*/
[Flags]
public enum OpenFlags {
NONE = 0,
FAST_OPEN;
public bool is_any_set(OpenFlags flags) {
return (this & flags) != 0;
}
public bool is_all_set(OpenFlags flags) {
return (this & flags) == flags;
}
}
/**
* Flags used for retrieving email.
*
@ -245,13 +267,16 @@ public interface Geary.Folder : BaseObject {
* associated signals will be fired as well.
*
* If the Folder has been opened previously, an internal open count is incremented and the
* method returns. There are no other side-effects.
* method returns. There are no other side-effects. This means it's possible for the
* open_flags parameter to be ignored. See the returned result for more information.
*
* A Folder may be reopened after it has been closed. This allows for Folder objects to be
* emitted by the Account object cheaply, but the client should only have a few open at a time,
* as each may represent an expensive resource (such as a network connection).
*
* Returns false if already opened.
*/
public abstract async void open_async(bool readonly, Cancellable? cancellable = null) throws Error;
public abstract async bool open_async(OpenFlags open_flags, Cancellable? cancellable = null) throws Error;
/**
* Wait for the Folder to become fully open or fails to open due to error. If not opened

View file

@ -133,7 +133,11 @@ private class Geary.ImapDB.Account : BaseObject {
}, cancellable);
}
public async void update_folder_async(Geary.Imap.Folder imap_folder, Cancellable? cancellable = null)
/**
* Only updates folder's STATUS message count, attributes, recent, and unseen; UIDVALIDITY and UIDNEXT
* updated when the folder is SELECT/EXAMINED (see update_folder_select_examine_async())
*/
public async void update_folder_status_async(Geary.Imap.Folder imap_folder, Cancellable? cancellable)
throws Error {
check_open();
@ -151,34 +155,19 @@ private class Geary.ImapDB.Account : BaseObject {
Db.Statement stmt;
if (parent_id != Db.INVALID_ROWID) {
stmt = cx.prepare(
"UPDATE FolderTable SET uid_validity=?, uid_next=?, attributes=? "
+ "WHERE parent_id=? AND name=?");
stmt.bind_int64(0, (properties.uid_validity != null) ? properties.uid_validity.value
: Imap.UIDValidity.INVALID);
stmt.bind_int64(1, (properties.uid_next != null) ? properties.uid_next.value
: Imap.UID.INVALID);
stmt.bind_string(2, properties.attrs.serialize());
stmt.bind_rowid(3, parent_id);
stmt.bind_string(4, path.basename);
"UPDATE FolderTable SET attributes=? WHERE parent_id=? AND name=?");
stmt.bind_string(0, properties.attrs.serialize());
stmt.bind_rowid(1, parent_id);
stmt.bind_string(2, path.basename);
} else {
stmt = cx.prepare(
"UPDATE FolderTable SET uid_validity=?, uid_next=?, attributes=? "
+ "WHERE parent_id IS NULL AND name=?");
stmt.bind_int64(0, (properties.uid_validity != null) ? properties.uid_validity.value
: Imap.UIDValidity.INVALID);
stmt.bind_int64(1, (properties.uid_next != null) ? properties.uid_next.value
: Imap.UID.INVALID);
stmt.bind_string(2, properties.attrs.serialize());
stmt.bind_string(3, path.basename);
"UPDATE FolderTable SET attributes=? WHERE parent_id IS NULL AND name=?");
stmt.bind_string(0, properties.attrs.serialize());
stmt.bind_string(1, path.basename);
}
stmt.exec();
if (properties.select_examine_messages >= 0) {
do_update_last_seen_total(cx, parent_id, path.basename, properties.select_examine_messages,
cancellable);
}
if (properties.status_messages >= 0) {
do_update_last_seen_status_total(cx, parent_id, path.basename, properties.status_messages,
cancellable);
@ -187,10 +176,83 @@ private class Geary.ImapDB.Account : BaseObject {
return Db.TransactionOutcome.COMMIT;
}, cancellable);
// update properties in the local folder
// update appropriate properties in the local folder
ImapDB.Folder? db_folder = get_local_folder(path);
if (db_folder != null)
db_folder.set_properties(properties);
if (db_folder != null) {
Imap.FolderProperties local_properties = db_folder.get_properties();
local_properties.unseen = properties.unseen;
local_properties.recent = properties.recent;
local_properties.attrs = properties.attrs;
if (properties.status_messages >= 0)
local_properties.set_status_message_count(properties.status_messages, false);
}
}
/**
* Only updates folder's SELECT/EXAMINE message count, UIDVALIDITY, UIDNEXT, unseen, and recent.
* See also update_folder_status_async().
*/
public async void update_folder_select_examine_async(Geary.Imap.Folder imap_folder, Cancellable? cancellable)
throws Error {
check_open();
Geary.Imap.FolderProperties properties = imap_folder.get_properties();
Geary.FolderPath path = imap_folder.get_path();
yield db.exec_transaction_async(Db.TransactionType.RW, (cx) => {
int64 parent_id;
if (!do_fetch_parent_id(cx, path, true, out parent_id, cancellable)) {
debug("Unable to find parent ID of %s to update properties", path.to_string());
return Db.TransactionOutcome.ROLLBACK;
}
int64 uid_validity = (properties.uid_validity != null) ? properties.uid_validity.value
: Imap.UIDValidity.INVALID;
int64 uid_next = (properties.uid_next != null) ? properties.uid_next.value
: Imap.UID.INVALID;
Db.Statement stmt;
if (parent_id != Db.INVALID_ROWID) {
stmt = cx.prepare(
"UPDATE FolderTable SET uid_validity=?, uid_next=? WHERE parent_id=? AND name=?");
stmt.bind_int64(0, uid_validity);
stmt.bind_int64(1, uid_next);
stmt.bind_rowid(2, parent_id);
stmt.bind_string(3, path.basename);
} else {
stmt = cx.prepare(
"UPDATE FolderTable SET uid_validity=?, uid_next=? WHERE parent_id IS NULL AND name=?");
stmt.bind_int64(0, uid_validity);
stmt.bind_int64(1, uid_next);
stmt.bind_string(2, path.basename);
}
stmt.exec();
if (properties.select_examine_messages >= 0) {
do_update_last_seen_select_examine_total(cx, parent_id, path.basename,
properties.select_examine_messages, cancellable);
}
return Db.TransactionOutcome.COMMIT;
}, cancellable);
// update appropriate properties in the local folder
ImapDB.Folder? db_folder = get_local_folder(path);
if (db_folder != null) {
Imap.FolderProperties local_properties = db_folder.get_properties();
local_properties.unseen = properties.unseen;
local_properties.recent = properties.recent;
local_properties.uid_validity = properties.uid_validity;
local_properties.uid_next = properties.uid_next;
if (properties.select_examine_messages >= 0)
local_properties.set_select_examine_message_count(properties.select_examine_messages);
}
}
private void initialize_contacts(Cancellable? cancellable = null) throws Error {
@ -664,11 +726,13 @@ private class Geary.ImapDB.Account : BaseObject {
return (parent_path == null ? null : parent_path.get_child(name));
}
private void do_update_last_seen_total(Db.Connection cx, int64 parent_id, string name, int total,
// For SELECT/EXAMINE responses, not STATUS responses
private void do_update_last_seen_select_examine_total(Db.Connection cx, int64 parent_id, string name, int total,
Cancellable? cancellable) throws Error {
do_update_total(cx, parent_id, name, "last_seen_total", total, cancellable);
}
// For STATUS responses, not SELECT/EXAMINE responses
private void do_update_last_seen_status_total(Db.Connection cx, int64 parent_id, string name,
int total, Cancellable? cancellable) throws Error {
do_update_total(cx, parent_id, name, "last_seen_status_total", total, cancellable);

View file

@ -93,7 +93,7 @@ private class Geary.ImapDB.Folder : BaseObject, Geary.ReferenceSemantics {
this.properties = properties;
}
public async void open_async(bool readonly, Cancellable? cancellable = null) throws Error {
public async void open_async(Cancellable? cancellable = null) throws Error {
if (opened)
throw new EngineError.ALREADY_OPEN("%s already open", to_string());

View file

@ -212,12 +212,14 @@ private class Geary.SmtpOutboxFolder : Geary.AbstractFolder, Geary.FolderSupport
throw new EngineError.OPEN_REQUIRED("Outbox not open");
}
public override async void open_async(bool readonly, Cancellable? cancellable = null)
public override async bool open_async(Geary.Folder.OpenFlags open_flags, Cancellable? cancellable = null)
throws Error {
if (open_count++ > 0)
return;
return false;
notify_opened(Geary.Folder.OpenState.LOCAL, properties.email_total);
return true;
}
public override async void close_async(Cancellable? cancellable = null) throws Error {

View file

@ -237,7 +237,7 @@ private class Geary.ImapEngine.AccountSynchronizer : Geary.BaseObject {
}
try {
yield folder.open_async(true, bg_cancellable);
yield folder.open_async(Folder.OpenFlags.FAST_OPEN, bg_cancellable);
yield folder.wait_for_open_async(bg_cancellable);
} catch (Error err) {
// don't need to close folder; if either calls throws an error, the folder is not open

View file

@ -337,7 +337,7 @@ private abstract class Geary.ImapEngine.GenericAccount : Geary.AbstractAccount {
}
try {
yield local.update_folder_async(remote_folder, cancellable);
yield local.update_folder_status_async(remote_folder, cancellable);
} catch (Error update_error) {
debug("Unable to update local folder %s with remote properties: %s",
remote_folder.to_string(), update_error.message);

View file

@ -11,6 +11,8 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
private const Geary.Email.Field NORMALIZATION_FIELDS =
Geary.Email.Field.PROPERTIES | Geary.Email.Field.FLAGS | ImapDB.Folder.REQUIRED_FOR_DUPLICATE_DETECTION;
private const Geary.Email.Field FAST_NORMALIZATION_FIELDS =
Geary.Email.Field.PROPERTIES | ImapDB.Folder.REQUIRED_FOR_DUPLICATE_DETECTION;
public override Account account { get { return _account; } }
internal ImapDB.Folder local_folder { get; protected set; }
@ -102,7 +104,12 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
return (remote_count >= 0) ? remote_count : last_seen_remote_count;
}
private async bool normalize_folders(Geary.Imap.Folder remote_folder, Cancellable? cancellable) throws Error {
private async bool normalize_folders(Geary.Imap.Folder remote_folder, Geary.Folder.OpenFlags open_flags,
Cancellable? cancellable) throws Error {
bool is_fast_open = open_flags.is_any_set(Geary.Folder.OpenFlags.FAST_OPEN);
if (is_fast_open)
debug("fast-open normalize_folders %s", to_string());
else
debug("normalize_folders %s", to_string());
Geary.Imap.FolderProperties local_properties = local_folder.get_properties();
@ -147,17 +154,54 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
return true;
}
// if UIDNEXT has changed, that indicates messages have been appended (and possibly removed)
int64 uidnext_diff = remote_properties.uid_next.value - local_properties.uid_next.value;
// fast-open means no updating of flags, so if UIDNEXT is the same as last time AND the total count
// of email is the same, then nothing has been added or removed (but flags may have changed)
if (is_fast_open && uidnext_diff == 0 && local_properties.email_total == remote_properties.email_total) {
debug("No messages added/removed in fast-open of %s, normalization completed", to_string());
return true;
}
Gee.Collection<Geary.EmailIdentifier> all_appended_ids = new Gee.ArrayList<Geary.EmailIdentifier>();
Gee.Collection<Geary.EmailIdentifier> all_locally_appended_ids = new Gee.ArrayList<Geary.EmailIdentifier>();
Gee.Collection<Geary.EmailIdentifier> all_removed_ids = new Gee.ArrayList<Geary.EmailIdentifier>();
Gee.Map<Geary.EmailIdentifier, Geary.EmailFlags> all_flags_changed = new Gee.HashMap<Geary.EmailIdentifier,
Geary.EmailFlags>();
// to match all flags and find all removed interior to the local store's vector of messages, start from
// local earliest message and work upwards
Geary.Imap.EmailIdentifier current_start_id = new Geary.Imap.EmailIdentifier(earliest_uid, local_folder.get_path());
// if fast-open and the difference in UIDNEXT values equals the difference in message count, then only
// an append could have happened, so only pull in the new messages ... note that this is not foolproof,
// as UIDs are not guaranteed to increase by 1; however, this is a standard implementation practice,
// so it's worth looking for
//
// (Also, this cannot fail; if this situation exists, then it cannot by definition indicate another
// situation, esp. messages being removed.)
if (is_fast_open) {
if (uidnext_diff == (remote_properties.select_examine_messages - local_properties.select_examine_messages)) {
current_start_id = new Geary.Imap.EmailIdentifier(latest_uid.next(), local_folder.get_path());
debug("fast-open %s: Messages only appended (local/remote UIDNEXT=%s/%s total=%d/%d diff=%s), only gathering new mail at %s",
to_string(), local_properties.uid_next.to_string(), remote_properties.uid_next.to_string(),
local_properties.select_examine_messages, remote_properties.select_examine_messages, uidnext_diff.to_string(),
current_start_id.to_string());
} else {
debug("fast-open %s: Messages appended/removed (local/remote UIDNEXT=%s/%s total=%d/%d diff=%s)", to_string(),
local_properties.uid_next.to_string(), remote_properties.uid_next.to_string(),
local_properties.select_examine_messages, remote_properties.select_examine_messages, uidnext_diff.to_string());
}
}
for (;;) {
// Get the local emails in the range ... use PARTIAL_OK to ensure all emails are normalized
Gee.List<Geary.Email>? old_local = yield local_folder.list_email_by_id_async(
current_start_id, NORMALIZATION_CHUNK_COUNT, NORMALIZATION_FIELDS,
current_start_id, NORMALIZATION_CHUNK_COUNT,
is_fast_open ? FAST_NORMALIZATION_FIELDS : NORMALIZATION_FIELDS,
ImapDB.Folder.ListFlags.PARTIAL_OK, cancellable);
// verify still open
@ -213,6 +257,8 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
break;
if (remote_uid != null && local_uid != null && remote_uid.value == local_uid.value) {
// only update flags if not doing a fast-open
if (!is_fast_open) {
// same, update flags (if changed) and move on
// Because local is PARTIAL_OK, EmailFlags may not be present
Geary.Imap.EmailFlags? local_email_flags = (Geary.Imap.EmailFlags) local_email.email_flags;
@ -232,6 +278,7 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
to_string(), remote_email.id.to_string());
}
}
}
remote_ctr++;
local_ctr++;
@ -408,9 +455,10 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
throw new EngineError.ALREADY_CLOSED("%s failed to open", to_string());
}
public override async void open_async(bool readonly, Cancellable? cancellable = null) throws Error {
public override async bool open_async(Geary.Folder.OpenFlags open_flags, Cancellable? cancellable = null)
throws Error {
if (open_count++ > 0)
return;
return false;
remote_semaphore = new Geary.Nonblocking.ReportingSemaphore<bool>(false);
@ -418,7 +466,7 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
replay_queue = new ReplayQueue(get_path().to_string(), remote_semaphore);
try {
yield local_folder.open_async(readonly, cancellable);
yield local_folder.open_async(cancellable);
} catch (Error err) {
notify_open_failed(OpenFailed.LOCAL_FAILED, err);
@ -436,22 +484,24 @@ private class Geary.ImapEngine.GenericFolder : Geary.AbstractFolder, Geary.Folde
// wait_for_remote_ready_async(), which uses a NonblockingSemaphore to indicate that the remote
// is open (or has failed to open). This allows for early calls to list and fetch emails
// can work out of the local cache until the remote is ready.
open_remote_async.begin(readonly, cancellable);
open_remote_async.begin(open_flags, cancellable);
return true;
}
private async void open_remote_async(bool readonly, Cancellable? cancellable) {
private async void open_remote_async(Geary.Folder.OpenFlags open_flags, Cancellable? cancellable) {
try {
debug("Opening remote %s", to_string());
Imap.Folder folder = (Imap.Folder) yield remote.fetch_folder_async(local_folder.get_path(),
cancellable);
yield folder.open_async(readonly, cancellable);
yield folder.open_async(cancellable);
// allow subclasses to examine the opened folder and resolve any vital
// inconsistencies
if (yield normalize_folders(folder, cancellable)) {
if (yield normalize_folders(folder, open_flags, cancellable)) {
// update flags, properties, etc.
yield local.update_folder_async(folder, cancellable);
yield local.update_folder_select_examine_async(folder, cancellable);
// signals
folder.messages_appended.connect(on_remote_messages_appended);

View file

@ -4,6 +4,40 @@
* (version 2.1 or later). See the COPYING file in this distribution.
*/
/**
* Geary.Imap.FolderProperties represent the Geary API's notion of FolderProperties but
* also hangs additional useful information available to IMAP-specific code (in the Engine,
* that includes imap, imap-engine, and imap-db).
*
* One important concept here is that there are two IMAP commands that return this information:
* STATUS (which is used by the background folder monitor to watch for specific events) and
* SELECT/EXAMINE (which is used to "enter" or "cd" into a folder and perform operations on mail
* within).
*
* Experience has shown that these commands are *not* guaranteed to return the same information,
* even if no state has changed on the server. This would seem to be a server bug, but one that
* has to be worked around.
*
* In any event, the properties here are updated by the following logic:
*
* When a folder is first "seen" by Geary, it generates an Imap.FolderProperties object with all
* the fields filled in except for status_messages or select_examine_messages, depending on which
* command was used to discover it. (In practice, the folder will be first recognized via STATUS,
* but this isn't guaranteed.)
*
* When new STATUS information comes in, this object's status_messages, unseen, recent, and attrs
* fields are updated.
*
* When a SELECT/EXAMINE occurs on this folder, this object's select_examine_messages, unseen,
* recent, uid_validity, and uid_next are updated.
*
* Over time, this object accumulates information depending on what operation was last
* performed on it.
*
* The base class' email_total is updated when either *_messages is updated; however, SELECT/EXAMINE
* is considered more authoritative than STATUS.
*/
public class Geary.Imap.FolderProperties : Geary.FolderProperties {
/**
* -1 if the Folder was not opened via SELECT or EXAMINE.
@ -13,11 +47,11 @@ public class Geary.Imap.FolderProperties : Geary.FolderProperties {
* -1 if the FolderProperties were not obtained via a STATUS command
*/
public int status_messages { get; private set; }
public int unseen { get; private set; }
public int recent { get; private set; }
public UIDValidity? uid_validity { get; private set; }
public UID? uid_next { get; private set; }
public MailboxAttributes attrs { get; private set; }
public int unseen { get; internal set; }
public int recent { get; internal set; }
public UIDValidity? uid_validity { get; internal set; }
public UID? uid_next { get; internal set; }
public MailboxAttributes attrs { get; internal set; }
// Note that unseen from SELECT/EXAMINE is the *position* of the first unseen message,
// not the total unseen count, so it should not be passed in here, but rather the unseen

View file

@ -10,7 +10,6 @@ private class Geary.Imap.Folder : BaseObject {
private ClientSessionManager session_mgr;
private MailboxInformation info;
private Geary.FolderPath path;
private Trillian readonly;
private Imap.FolderProperties properties;
private Mailbox? mailbox = null;
@ -26,8 +25,6 @@ private class Geary.Imap.Folder : BaseObject {
this.info = info;
this.path = path;
readonly = Trillian.UNKNOWN;
properties = new Imap.FolderProperties.status(status, info.attrs);
}
@ -37,8 +34,6 @@ private class Geary.Imap.Folder : BaseObject {
this.info = info;
this.path = path;
readonly = Trillian.UNKNOWN;
properties = new Imap.FolderProperties(0, 0, 0, null, null, info.attrs);
}
@ -50,15 +45,11 @@ private class Geary.Imap.Folder : BaseObject {
return properties;
}
public async void open_async(bool readonly, Cancellable? cancellable = null) throws Error {
public async void open_async(Cancellable? cancellable = null) throws Error {
if (mailbox != null)
throw new EngineError.ALREADY_OPEN("%s already open", to_string());
mailbox = yield session_mgr.select_examine_mailbox(path, info.delim, !readonly,
cancellable);
// update with new information
this.readonly = Trillian.from_boolean(readonly);
mailbox = yield session_mgr.select_mailbox(path, info.delim, cancellable);
// connect to signals
mailbox.exists_altered.connect(on_exists_altered);
@ -86,7 +77,6 @@ private class Geary.Imap.Folder : BaseObject {
mailbox.disconnected.disconnect(on_disconnected);
mailbox = null;
readonly = Trillian.UNKNOWN;
}
private void on_exists_altered(int old_exists, int new_exists) {