mirror of
https://github.com/classilla/tenfourfox.git
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225 lines
7.0 KiB
C++
225 lines
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 sts=2 expandtab
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "StorageBaseStatementInternal.h"
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#include "nsProxyRelease.h"
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#include "mozStorageBindingParamsArray.h"
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#include "mozStorageStatementData.h"
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#include "mozStorageAsyncStatementExecution.h"
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namespace mozilla {
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namespace storage {
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////////////////////////////////////////////////////////////////////////////////
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//// Local Classes
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/**
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* Used to finalize an asynchronous statement on the background thread.
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*/
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class AsyncStatementFinalizer : public nsRunnable
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{
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public:
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/**
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* Constructor for the event.
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*
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* @param aStatement
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* We need the AsyncStatement to be able to get at the sqlite3_stmt;
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* we only access/create it on the async thread.
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* @param aConnection
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* We need the connection to know what thread to release the statement
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* on. We release the statement on that thread since releasing the
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* statement might end up releasing the connection too.
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*/
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AsyncStatementFinalizer(StorageBaseStatementInternal *aStatement,
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Connection *aConnection)
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: mStatement(aStatement)
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, mConnection(aConnection)
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{
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}
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NS_IMETHOD Run()
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{
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if (mStatement->mAsyncStatement) {
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(void)::sqlite3_finalize(mStatement->mAsyncStatement);
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mStatement->mAsyncStatement = nullptr;
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}
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(void)::NS_ProxyRelease(mConnection->threadOpenedOn, mStatement);
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return NS_OK;
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}
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private:
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RefPtr<StorageBaseStatementInternal> mStatement;
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RefPtr<Connection> mConnection;
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};
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/**
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* Finalize a sqlite3_stmt on the background thread for a statement whose
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* destructor was invoked and the statement was non-null.
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*/
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class LastDitchSqliteStatementFinalizer : public nsRunnable
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{
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public:
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/**
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* Event constructor.
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*
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* @param aConnection
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* Used to keep the connection alive. If we failed to do this, it
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* is possible that the statement going out of scope invoking us
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* might have the last reference to the connection and so trigger
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* an attempt to close the connection which is doomed to fail
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* (because the asynchronous execution thread must exist which will
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* trigger the failure case).
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* @param aStatement
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* The sqlite3_stmt to finalize. This object takes ownership /
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* responsibility for the instance and all other references to it
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* should be forgotten.
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*/
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LastDitchSqliteStatementFinalizer(RefPtr<Connection> &aConnection,
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sqlite3_stmt *aStatement)
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: mConnection(aConnection)
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, mAsyncStatement(aStatement)
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{
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NS_PRECONDITION(aConnection, "You must provide a Connection");
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}
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NS_IMETHOD Run()
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{
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(void)::sqlite3_finalize(mAsyncStatement);
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mAsyncStatement = nullptr;
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// Because of our ambiguous nsISupports we cannot use the NS_ProxyRelease
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// template helpers.
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Connection *rawConnection = nullptr;
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mConnection.swap(rawConnection);
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(void)::NS_ProxyRelease(
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rawConnection->threadOpenedOn,
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NS_ISUPPORTS_CAST(mozIStorageConnection *, rawConnection));
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return NS_OK;
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}
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private:
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RefPtr<Connection> mConnection;
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sqlite3_stmt *mAsyncStatement;
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};
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////////////////////////////////////////////////////////////////////////////////
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//// StorageBaseStatementInternal
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StorageBaseStatementInternal::StorageBaseStatementInternal()
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: mAsyncStatement(nullptr)
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{
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}
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void
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StorageBaseStatementInternal::asyncFinalize()
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{
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nsIEventTarget *target = mDBConnection->getAsyncExecutionTarget();
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if (target) {
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// Attempt to finalize asynchronously
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nsCOMPtr<nsIRunnable> event =
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new AsyncStatementFinalizer(this, mDBConnection);
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// Dispatch. Note that dispatching can fail, typically if
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// we have a race condition with asyncClose(). It's ok,
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// let asyncClose() win.
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(void)target->Dispatch(event, NS_DISPATCH_NORMAL);
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}
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// If we cannot get the background thread,
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// mozStorageConnection::AsyncClose() has already been called and
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// the statement either has been or will be cleaned up by
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// internalClose().
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}
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void
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StorageBaseStatementInternal::destructorAsyncFinalize()
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{
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if (!mAsyncStatement)
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return;
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// If we reach this point, our owner has not finalized this
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// statement, yet we are being destructed. If possible, we want to
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// auto-finalize it early, to release the resources early.
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nsIEventTarget *target = mDBConnection->getAsyncExecutionTarget();
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if (target) {
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// If we can get the async execution target, we can indeed finalize
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// the statement, as the connection is still open.
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bool isAsyncThread = false;
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(void)target->IsOnCurrentThread(&isAsyncThread);
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nsCOMPtr<nsIRunnable> event =
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new LastDitchSqliteStatementFinalizer(mDBConnection, mAsyncStatement);
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if (isAsyncThread) {
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(void)event->Run();
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} else {
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(void)target->Dispatch(event, NS_DISPATCH_NORMAL);
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}
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}
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// We might not be able to dispatch to the background thread,
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// presumably because it is being shutdown. Since said shutdown will
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// finalize the statement, we just need to clean-up around here.
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mAsyncStatement = nullptr;
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}
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NS_IMETHODIMP
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StorageBaseStatementInternal::NewBindingParamsArray(
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mozIStorageBindingParamsArray **_array
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)
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{
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nsCOMPtr<mozIStorageBindingParamsArray> array = new BindingParamsArray(this);
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NS_ENSURE_TRUE(array, NS_ERROR_OUT_OF_MEMORY);
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array.forget(_array);
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return NS_OK;
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}
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NS_IMETHODIMP
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StorageBaseStatementInternal::ExecuteAsync(
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mozIStorageStatementCallback *aCallback,
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mozIStoragePendingStatement **_stmt
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)
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{
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// We used to call Connection::ExecuteAsync but it takes a
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// mozIStorageBaseStatement signature because it is also a public API. Since
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// our 'this' has no static concept of mozIStorageBaseStatement and Connection
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// would just QI it back across to a StorageBaseStatementInternal and the
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// actual logic is very simple, we now roll our own.
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nsTArray<StatementData> stmts(1);
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StatementData data;
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nsresult rv = getAsynchronousStatementData(data);
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NS_ENSURE_SUCCESS(rv, rv);
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NS_ENSURE_TRUE(stmts.AppendElement(data), NS_ERROR_OUT_OF_MEMORY);
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// Dispatch to the background
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return AsyncExecuteStatements::execute(stmts, mDBConnection,
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mNativeConnection, aCallback, _stmt);
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}
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NS_IMETHODIMP
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StorageBaseStatementInternal::EscapeStringForLIKE(
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const nsAString &aValue,
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const char16_t aEscapeChar,
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nsAString &_escapedString
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)
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{
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const char16_t MATCH_ALL('%');
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const char16_t MATCH_ONE('_');
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_escapedString.Truncate(0);
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for (uint32_t i = 0; i < aValue.Length(); i++) {
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if (aValue[i] == aEscapeChar || aValue[i] == MATCH_ALL ||
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aValue[i] == MATCH_ONE) {
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_escapedString += aEscapeChar;
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}
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_escapedString += aValue[i];
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}
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return NS_OK;
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}
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} // namespace storage
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} // namespace mozilla
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