src/net/instaweb/rewriter/process_context.cc

// Copyright 2011 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: jmarantz@google.com (Joshua Marantz)

#include "net/instaweb/rewriter/public/process_context.h"

#include "base/logging.h"
#include "pagespeed/kernel/http/google_url.h"
#include "pagespeed/kernel/html/html_keywords.h"
#include "pagespeed/kernel/http/domain_registry.h"
#include "pagespeed/kernel/js/js_tokenizer.h"
#include "pagespeed/kernel/util/gflags.h"

#include "google/protobuf/stubs/common.h"
using namespace google;  // NOLINT

namespace {

int construction_count = 0;

}

// Clean up valgrind-based memory-leak checks by deleting statically allocated
// data from various libraries.  This must be called both from unit-tests
// and from the Apache module, so that valgrind can be run on both of them.

namespace net_instaweb {

ProcessContext::ProcessContext()
    : js_tokenizer_patterns_(new pagespeed::js::JsTokenizerPatterns) {
  ++construction_count;
  CHECK_EQ(1, construction_count)
      << "ProcessContext must only be constructed once.";

  domain_registry::Init();
  HtmlKeywords::Init();

  // url/url_util.cc lazily initializes its "standard_schemes" table in a
  // thread-unsafe way and so it must be explicitly initialized prior to thread
  // creation, and explicitly terminated after thread quiescence.
  url::Initialize();
}

ProcessContext::~ProcessContext() {
  // Clean up statics from third_party code first.

  // The command-line flags structures are lazily initialized, but
  // they are done so in static constructors resulting from DEFINE_int32
  // and other similar macros.  So they must happen prior to threads
  // starting up.
  ShutDownCommandLineFlags();

  // The protobuf shutdown infrastructure is lazily initialized in a threadsafe
  // manner.  See third_party/protobuf/src/google/protobuf/stubs/common.cc,
  // function InitShutdownFunctionsOnce.
  google::protobuf::ShutdownProtobufLibrary();

  url::Shutdown();
  HtmlKeywords::ShutDown();
}

}  // namespace net_instaweb