public void UpdateIndex()
{
Log.V(Log.TagView, "Re-indexing view: %s", name);
System.Diagnostics.Debug.Assert((mapBlock != null));
if (GetViewId() <= 0)
{
string msg = string.Format("getViewId() < 0");
throw new CouchbaseLiteException(msg, new Status(Status.NotFound));
}
database.BeginTransaction();
Status result = new Status(Status.InternalServerError);
Cursor cursor = null;
try
{
long lastSequence = GetLastSequenceIndexed();
long dbMaxSequence = database.GetLastSequenceNumber();
if (lastSequence == dbMaxSequence)
{
// nothing to do (eg, kCBLStatusNotModified)
Log.V(Log.TagView, "lastSequence (%s) == dbMaxSequence (%s), nothing to do", lastSequence
, dbMaxSequence);
result.SetCode(Status.NotModified);
return;
}
// First remove obsolete emitted results from the 'maps' table:
long sequence = lastSequence;
if (lastSequence < 0)
{
string msg = string.Format("lastSequence < 0 (%s)", lastSequence);
throw new CouchbaseLiteException(msg, new Status(Status.InternalServerError));
}
if (lastSequence == 0)
{
// If the lastSequence has been reset to 0, make sure to remove
// any leftover rows:
string[] whereArgs = new string[] { Sharpen.Extensions.ToString(GetViewId()) };
database.GetDatabase().Delete("maps", "view_id=?", whereArgs);
}
else
{
// Delete all obsolete map results (ones from since-replaced
// revisions):
string[] args = new string[] { Sharpen.Extensions.ToString(GetViewId()), System.Convert.ToString
(lastSequence), System.Convert.ToString(lastSequence) };
database.GetDatabase().ExecSQL("DELETE FROM maps WHERE view_id=? AND sequence IN ("
+ "SELECT parent FROM revs WHERE sequence>? " + "AND parent>0 AND parent<=?)",
args);
}
int deleted = 0;
cursor = database.GetDatabase().RawQuery("SELECT changes()", null);
cursor.MoveToNext();
deleted = cursor.GetInt(0);
cursor.Close();
// This is the emit() block, which gets called from within the
// user-defined map() block
// that's called down below.
AbstractTouchMapEmitBlock emitBlock = new _AbstractTouchMapEmitBlock_428(this);
//Log.v(Log.TAG_VIEW, " emit(" + keyJson + ", "
// + valueJson + ")");
// find a better way to propagate this back
// Now scan every revision added since the last time the view was
// indexed:
string[] selectArgs = new string[] { System.Convert.ToString(lastSequence) };
cursor = database.GetDatabase().RawQuery("SELECT revs.doc_id, sequence, docid, revid, json, no_attachments FROM revs, docs "
+ "WHERE sequence>? AND current!=0 AND deleted=0 " + "AND revs.doc_id = docs.doc_id "
+ "ORDER BY revs.doc_id, revid DESC", selectArgs);
long lastDocID = 0;
bool keepGoing = cursor.MoveToNext();
while (keepGoing)
{
long docID = cursor.GetLong(0);
if (docID != lastDocID)
{
// Only look at the first-iterated revision of any document,
// because this is the
// one with the highest revid, hence the "winning" revision
// of a conflict.
lastDocID = docID;
// Reconstitute the document as a dictionary:
sequence = cursor.GetLong(1);
string docId = cursor.GetString(2);
if (docId.StartsWith("_design/"))
{
// design docs don't get indexed!
keepGoing = cursor.MoveToNext();
continue;
}
string revId = cursor.GetString(3);
byte[] json = cursor.GetBlob(4);
bool noAttachments = cursor.GetInt(5) > 0;
while ((keepGoing = cursor.MoveToNext()) && cursor.GetLong(0) == docID)
{
}
// Skip rows with the same doc_id -- these are losing conflicts.
if (lastSequence > 0)
{
// Find conflicts with documents from previous indexings.
string[] selectArgs2 = new string[] { System.Convert.ToString(docID), System.Convert.ToString
(lastSequence) };
Cursor cursor2 = database.GetDatabase().RawQuery("SELECT revid, sequence FROM revs "
+ "WHERE doc_id=? AND sequence<=? AND current!=0 AND deleted=0 " + "ORDER BY revID DESC "
+ "LIMIT 1", selectArgs2);
if (cursor2.MoveToNext())
{
string oldRevId = cursor2.GetString(0);
// This is the revision that used to be the 'winner'.
// Remove its emitted rows:
long oldSequence = cursor2.GetLong(1);
string[] args = new string[] { Sharpen.Extensions.ToString(GetViewId()), System.Convert.ToString
(oldSequence) };
database.GetDatabase().ExecSQL("DELETE FROM maps WHERE view_id=? AND sequence=?",
args);
if (RevisionInternal.CBLCompareRevIDs(oldRevId, revId) > 0)
{
// It still 'wins' the conflict, so it's the one that
// should be mapped [again], not the current revision!
revId = oldRevId;
sequence = oldSequence;
string[] selectArgs3 = new string[] { System.Convert.ToString(sequence) };
json = Utils.ByteArrayResultForQuery(database.GetDatabase(), "SELECT json FROM revs WHERE sequence=?"
, selectArgs3);
}
}
}
// Get the document properties, to pass to the map function:
EnumSet <Database.TDContentOptions> contentOptions = EnumSet.NoneOf <Database.TDContentOptions
>();
if (noAttachments)
{
contentOptions.AddItem(Database.TDContentOptions.TDNoAttachments);
}
IDictionary <string, object> properties = database.DocumentPropertiesFromJSON(json
, docId, revId, false, sequence, contentOptions);
if (properties != null)
{
// Call the user-defined map() to emit new key/value
// pairs from this revision:
emitBlock.SetSequence(sequence);
mapBlock.Map(properties, emitBlock);
}
}
}
// Finally, record the last revision sequence number that was
// indexed:
ContentValues updateValues = new ContentValues();
updateValues.Put("lastSequence", dbMaxSequence);
string[] whereArgs_1 = new string[] { Sharpen.Extensions.ToString(GetViewId()) };
database.GetDatabase().Update("views", updateValues, "view_id=?", whereArgs_1);
// FIXME actually count number added :)
Log.V(Log.TagView, "Finished re-indexing view: %s " + " up to sequence %s" + " (deleted %s added ?)"
, name, dbMaxSequence, deleted);
result.SetCode(Status.Ok);
}
catch (SQLException e)
{
throw new CouchbaseLiteException(e, new Status(Status.DbError));
}
finally
{
if (cursor != null)
{
cursor.Close();
}
if (!result.IsSuccessful())
{
Log.W(Log.TagView, "Failed to rebuild view %s. Result code: %d", name, result.GetCode
());
}
if (database != null)
{
database.EndTransaction(result.IsSuccessful());
}
}
}
public void UpdateIndex()
{
Log.V(Log.TagView, "Re-indexing view: %s", name);
System.Diagnostics.Debug.Assert((mapBlock != null));
if (GetViewId() <= 0)
{
string msg = string.Format("getViewId() < 0");
throw new CouchbaseLiteException(msg, new Status(Status.NotFound));
}
database.BeginTransaction();
Status result = new Status(Status.InternalServerError);
Cursor cursor = null;
try
{
long lastSequence = GetLastSequenceIndexed();
long dbMaxSequence = database.GetLastSequenceNumber();
if (lastSequence == dbMaxSequence)
{
// nothing to do (eg, kCBLStatusNotModified)
Log.V(Log.TagView, "lastSequence (%s) == dbMaxSequence (%s), nothing to do", lastSequence
, dbMaxSequence);
result.SetCode(Status.NotModified);
return;
}
// First remove obsolete emitted results from the 'maps' table:
long sequence = lastSequence;
if (lastSequence < 0)
{
string msg = string.Format("lastSequence < 0 (%s)", lastSequence);
throw new CouchbaseLiteException(msg, new Status(Status.InternalServerError));
}
if (lastSequence == 0)
{
// If the lastSequence has been reset to 0, make sure to remove
// any leftover rows:
string[] whereArgs = new string[] { Sharpen.Extensions.ToString(GetViewId()) };
database.GetDatabase().Delete("maps", "view_id=?", whereArgs);
}
else
{
// Delete all obsolete map results (ones from since-replaced
// revisions):
string[] args = new string[] { Sharpen.Extensions.ToString(GetViewId()), System.Convert.ToString
(lastSequence), System.Convert.ToString(lastSequence) };
database.GetDatabase().ExecSQL("DELETE FROM maps WHERE view_id=? AND sequence IN ("
+ "SELECT parent FROM revs WHERE sequence>? " + "AND parent>0 AND parent<=?)",
args);
}
int deleted = 0;
cursor = database.GetDatabase().RawQuery("SELECT changes()", null);
cursor.MoveToNext();
deleted = cursor.GetInt(0);
cursor.Close();
// This is the emit() block, which gets called from within the
// user-defined map() block
// that's called down below.
AbstractTouchMapEmitBlock emitBlock = new _AbstractTouchMapEmitBlock_428(this);
//Log.v(Log.TAG_VIEW, " emit(" + keyJson + ", "
// + valueJson + ")");
// find a better way to propagate this back
// Now scan every revision added since the last time the view was
// indexed:
string[] selectArgs = new string[] { System.Convert.ToString(lastSequence) };
cursor = database.GetDatabase().RawQuery("SELECT revs.doc_id, sequence, docid, revid, json, no_attachments FROM revs, docs "
+ "WHERE sequence>? AND current!=0 AND deleted=0 " + "AND revs.doc_id = docs.doc_id "
+ "ORDER BY revs.doc_id, revid DESC", selectArgs);
long lastDocID = 0;
bool keepGoing = cursor.MoveToNext();
while (keepGoing)
{
long docID = cursor.GetLong(0);
if (docID != lastDocID)
{
// Only look at the first-iterated revision of any document,
// because this is the
// one with the highest revid, hence the "winning" revision
// of a conflict.
lastDocID = docID;
// Reconstitute the document as a dictionary:
sequence = cursor.GetLong(1);
string docId = cursor.GetString(2);
if (docId.StartsWith("_design/"))
{
// design docs don't get indexed!
keepGoing = cursor.MoveToNext();
continue;
}
string revId = cursor.GetString(3);
byte[] json = cursor.GetBlob(4);
bool noAttachments = cursor.GetInt(5) > 0;
while ((keepGoing = cursor.MoveToNext()) && cursor.GetLong(0) == docID)
{
}
// Skip rows with the same doc_id -- these are losing conflicts.
if (lastSequence > 0)
{
// Find conflicts with documents from previous indexings.
string[] selectArgs2 = new string[] { System.Convert.ToString(docID), System.Convert.ToString
(lastSequence) };
Cursor cursor2 = database.GetDatabase().RawQuery("SELECT revid, sequence FROM revs "
+ "WHERE doc_id=? AND sequence<=? AND current!=0 AND deleted=0 " + "ORDER BY revID DESC "
+ "LIMIT 1", selectArgs2);
if (cursor2.MoveToNext())
{
string oldRevId = cursor2.GetString(0);
// This is the revision that used to be the 'winner'.
// Remove its emitted rows:
long oldSequence = cursor2.GetLong(1);
string[] args = new string[] { Sharpen.Extensions.ToString(GetViewId()), System.Convert.ToString
(oldSequence) };
database.GetDatabase().ExecSQL("DELETE FROM maps WHERE view_id=? AND sequence=?",
args);
if (RevisionInternal.CBLCompareRevIDs(oldRevId, revId) > 0)
{
// It still 'wins' the conflict, so it's the one that
// should be mapped [again], not the current revision!
revId = oldRevId;
sequence = oldSequence;
string[] selectArgs3 = new string[] { System.Convert.ToString(sequence) };
json = Utils.ByteArrayResultForQuery(database.GetDatabase(), "SELECT json FROM revs WHERE sequence=?"
, selectArgs3);
}
}
}
// Get the document properties, to pass to the map function:
EnumSet<Database.TDContentOptions> contentOptions = EnumSet.NoneOf<Database.TDContentOptions
>();
if (noAttachments)
{
contentOptions.AddItem(Database.TDContentOptions.TDNoAttachments);
}
IDictionary<string, object> properties = database.DocumentPropertiesFromJSON(json
, docId, revId, false, sequence, contentOptions);
if (properties != null)
{
// Call the user-defined map() to emit new key/value
// pairs from this revision:
emitBlock.SetSequence(sequence);
mapBlock.Map(properties, emitBlock);
}
}
}
// Finally, record the last revision sequence number that was
// indexed:
ContentValues updateValues = new ContentValues();
updateValues.Put("lastSequence", dbMaxSequence);
string[] whereArgs_1 = new string[] { Sharpen.Extensions.ToString(GetViewId()) };
database.GetDatabase().Update("views", updateValues, "view_id=?", whereArgs_1);
// FIXME actually count number added :)
Log.V(Log.TagView, "Finished re-indexing view: %s " + " up to sequence %s" + " (deleted %s added ?)"
, name, dbMaxSequence, deleted);
result.SetCode(Status.Ok);
}
catch (SQLException e)
{
throw new CouchbaseLiteException(e, new Status(Status.DbError));
}
finally
{
if (cursor != null)
{
cursor.Close();
}
if (!result.IsSuccessful())
{
Log.W(Log.TagView, "Failed to rebuild view %s. Result code: %d", name, result.GetCode
());
}
if (database != null)
{
database.EndTransaction(result.IsSuccessful());
}
}
}
