+
−/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+
− * vim: sw=2 ts=2 sts=2 expandtab
+
− * This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0. If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
−
+
−#include "StorageBaseStatementInternal.h"
+
−
+
−#include "nsProxyRelease.h"
+
−
+
−#include "mozStorageBindingParamsArray.h"
+
−#include "mozStorageStatementData.h"
+
−#include "mozStorageAsyncStatementExecution.h"
+
−
+
−namespace mozilla {
+
−namespace storage {
+
−
+
−////////////////////////////////////////////////////////////////////////////////
+
−//// Local Classes
+
−
+
−/**
+
− * Used to finalize an asynchronous statement on the background thread.
+
− */
+
−class AsyncStatementFinalizer : public Runnable
+
−{
+
−public:
+
−  /**
+
−   * 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.
+
−   */
+
−  AsyncStatementFinalizer(StorageBaseStatementInternal* aStatement,
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−                          Connection* aConnection)
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−    : Runnable("storage::AsyncStatementFinalizer")
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−    , mStatement(aStatement)
+
−    , mConnection(aConnection)
+
−  {
+
−  }
+
−
+
−  NS_IMETHOD Run() override
+
−  {
+
−    if (mStatement->mAsyncStatement) {
+
−      sqlite3_finalize(mStatement->mAsyncStatement);
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−      mStatement->mAsyncStatement = nullptr;
+
−    }
+
−
+
−    nsCOMPtr<nsIThread> targetThread(mConnection->threadOpenedOn);
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−    NS_ProxyRelease(
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−      "AsyncStatementFinalizer::mStatement", targetThread, mStatement.forget());
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−    return NS_OK;
+
−  }
+
−private:
+
−  RefPtr<StorageBaseStatementInternal> mStatement;
+
−  RefPtr<Connection> mConnection;
+
−};
+
−
+
−/**
+
− * 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.
+
− */
+
−class LastDitchSqliteStatementFinalizer : public Runnable
+
−{
+
−public:
+
−  /**
+
−   * Event constructor.
+
−   *
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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).
+
−   * @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.
+
−   */
+
−  LastDitchSqliteStatementFinalizer(RefPtr<Connection>& aConnection,
+
−                                    sqlite3_stmt* aStatement)
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−    : Runnable("storage::LastDitchSqliteStatementFinalizer")
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−    , mConnection(aConnection)
+
−    , mAsyncStatement(aStatement)
+
−  {
+
−    NS_PRECONDITION(aConnection, "You must provide a Connection");
+
−  }
+
−
+
−  NS_IMETHOD Run() override
+
−  {
+
−    (void)::sqlite3_finalize(mAsyncStatement);
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−    mAsyncStatement = nullptr;
+
−
+
−    nsCOMPtr<nsIThread> target(mConnection->threadOpenedOn);
+
−    (void)::NS_ProxyRelease(
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−      "LastDitchSqliteStatementFinalizer::mConnection",
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−      target, mConnection.forget());
+
−    return NS_OK;
+
−  }
+
−private:
+
−  RefPtr<Connection> mConnection;
+
−  sqlite3_stmt *mAsyncStatement;
+
−};
+
−
+
−////////////////////////////////////////////////////////////////////////////////
+
−//// StorageBaseStatementInternal
+
−
+
−StorageBaseStatementInternal::StorageBaseStatementInternal()
+
−: mAsyncStatement(nullptr)
+
−{
+
−}
+
−
+
−void
+
−StorageBaseStatementInternal::asyncFinalize()
+
−{
+
−  nsIEventTarget *target = mDBConnection->getAsyncExecutionTarget();
+
−  if (target) {
+
−    // Attempt to finalize asynchronously
+
−    nsCOMPtr<nsIRunnable> event =
+
−      new AsyncStatementFinalizer(this, mDBConnection);
+
−
+
−    // Dispatch. Note that dispatching can fail, typically if
+
−    // we have a race condition with asyncClose(). It's ok,
+
−    // let asyncClose() win.
+
−    (void)target->Dispatch(event, NS_DISPATCH_NORMAL);
+
−  }
+
−  // If we cannot get the background thread,
+
−  // mozStorageConnection::AsyncClose() has already been called and
+
−  // the statement either has been or will be cleaned up by
+
−  // internalClose().
+
−}
+
−
+
−void
+
−StorageBaseStatementInternal::destructorAsyncFinalize()
+
−{
+
−  if (!mAsyncStatement)
+
−    return;
+
−
+
−  bool isOwningThread = false;
+
−  (void)mDBConnection->threadOpenedOn->IsOnCurrentThread(&isOwningThread);
+
−  if (isOwningThread) {
+
−    // If we are the owning thread (currently that means we're also the
+
−    // main thread), then we can get the async target and just dispatch
+
−    // to it.
+
−    nsIEventTarget *target = mDBConnection->getAsyncExecutionTarget();
+
−    if (target) {
+
−      nsCOMPtr<nsIRunnable> event =
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−        new LastDitchSqliteStatementFinalizer(mDBConnection, mAsyncStatement);
+
−      (void)target->Dispatch(event, NS_DISPATCH_NORMAL);
+
−    }
+
−  } else {
+
−    // If we're not the owning thread, assume we're the async thread, and
+
−    // just run the statement.
+
−    nsCOMPtr<nsIRunnable> event =
+
−      new LastDitchSqliteStatementFinalizer(mDBConnection, mAsyncStatement);
+
−    (void)event->Run();
+
−  }
+
−
+
−
+
−  // We might not be able to dispatch to the background thread,
+
−  // presumably because it is being shutdown. Since said shutdown will
+
−  // finalize the statement, we just need to clean-up around here.
+
−  mAsyncStatement = nullptr;
+
−}
+
−
+
−NS_IMETHODIMP
+
−StorageBaseStatementInternal::NewBindingParamsArray(
+
−  mozIStorageBindingParamsArray **_array
+
−)
+
−{
+
−  nsCOMPtr<mozIStorageBindingParamsArray> array = new BindingParamsArray(this);
+
−  NS_ENSURE_TRUE(array, NS_ERROR_OUT_OF_MEMORY);
+
−
+
−  array.forget(_array);
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−StorageBaseStatementInternal::ExecuteAsync(
+
−  mozIStorageStatementCallback *aCallback,
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−  mozIStoragePendingStatement **_stmt
+
−)
+
−{
+
−  // We used to call Connection::ExecuteAsync but it takes a
+
−  // mozIStorageBaseStatement signature because it is also a public API.  Since
+
−  // our 'this' has no static concept of mozIStorageBaseStatement and Connection
+
−  // would just QI it back across to a StorageBaseStatementInternal and the
+
−  // actual logic is very simple, we now roll our own.
+
−  nsTArray<StatementData> stmts(1);
+
−  StatementData data;
+
−  nsresult rv = getAsynchronousStatementData(data);
+
−  NS_ENSURE_SUCCESS(rv, rv);
+
−  NS_ENSURE_TRUE(stmts.AppendElement(data), NS_ERROR_OUT_OF_MEMORY);
+
−
+
−  // Dispatch to the background
+
−  return AsyncExecuteStatements::execute(stmts, mDBConnection,
+
−                                         mNativeConnection, aCallback, _stmt);
+
−}
+
−
+
−NS_IMETHODIMP
+
−StorageBaseStatementInternal::EscapeStringForLIKE(
+
−  const nsAString &aValue,
+
−  const char16_t aEscapeChar,
+
−  nsAString &_escapedString
+
−)
+
−{
+
−  const char16_t MATCH_ALL('%');
+
−  const char16_t MATCH_ONE('_');
+
−
+
−  _escapedString.Truncate(0);
+
−
+
−  for (uint32_t i = 0; i < aValue.Length(); i++) {
+
−    if (aValue[i] == aEscapeChar || aValue[i] == MATCH_ALL ||
+
−        aValue[i] == MATCH_ONE) {
+
−      _escapedString += aEscapeChar;
+
−    }
+
−    _escapedString += aValue[i];
+
−  }
+
−  return NS_OK;
+
−}
+
−
+
−} // namespace storage
+
−} // namespace mozilla