CSE2410 Fall 2014 Bounce

// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "node_stat_watcher.h"

#include <assert.h>

#include <string.h>

#include <stdlib.h>

namespace node {

using v8::FunctionCallbackInfo;

using v8::FunctionTemplate;

using v8::Handle;

using v8::HandleScope;

using v8::Integer;

using v8::Local;

using v8::Object;

using v8::String;

using v8::Value;

static Cached<String> onchange_sym;

static Cached<String> onstop_sym;

void StatWatcher::Initialize(Handle<Object> target) {

  HandleScope scope(node_isolate);

  Local<FunctionTemplate> t = FunctionTemplate::New(StatWatcher::New);

  t->InstanceTemplate()->SetInternalFieldCount(1);

  t->SetClassName(String::NewSymbol("StatWatcher"));

  NODE_SET_PROTOTYPE_METHOD(t, "start", StatWatcher::Start);

  NODE_SET_PROTOTYPE_METHOD(t, "stop", StatWatcher::Stop);

  target->Set(String::NewSymbol("StatWatcher"), t->GetFunction());

}

static void Delete(uv_handle_t* handle) {

  delete reinterpret_cast<uv_fs_poll_t*>(handle);

}

StatWatcher::StatWatcher() : ObjectWrap(),

                             watcher_(new uv_fs_poll_t) {

  uv_fs_poll_init(uv_default_loop(), watcher_);

  watcher_->data = static_cast<void*>(this);

}

StatWatcher::~StatWatcher() {

  Stop();

  uv_close(reinterpret_cast<uv_handle_t*>(watcher_), Delete);

}

void StatWatcher::Callback(uv_fs_poll_t* handle,

                           int status,

                           const uv_stat_t* prev,

                           const uv_stat_t* curr) {

  StatWatcher* wrap = static_cast<StatWatcher*>(handle->data);

  assert(wrap->watcher_ == handle);

  HandleScope scope(node_isolate);

  Local<Value> argv[3];

  argv[0] = BuildStatsObject(curr);

  argv[1] = BuildStatsObject(prev);

  argv[2] = Integer::New(status, node_isolate);

  if (onchange_sym.IsEmpty()) {

    onchange_sym = String::New("onchange");

  }

  MakeCallback(wrap->handle(node_isolate),

               onchange_sym,

               ARRAY_SIZE(argv),

               argv);

}

void StatWatcher::New(const FunctionCallbackInfo<Value>& args) {

  assert(args.IsConstructCall());

  HandleScope scope(node_isolate);

  StatWatcher* s = new StatWatcher();

  s->Wrap(args.This());

}

void StatWatcher::Start(const FunctionCallbackInfo<Value>& args) {

  assert(args.Length() == 3);

  HandleScope scope(node_isolate);

  StatWatcher* wrap = ObjectWrap::Unwrap<StatWatcher>(args.This());

  String::Utf8Value path(args[0]);

  const bool persistent = args[1]->BooleanValue();

  const uint32_t interval = args[2]->Uint32Value();

  if (!persistent) uv_unref(reinterpret_cast<uv_handle_t*>(wrap->watcher_));

  uv_fs_poll_start(wrap->watcher_, Callback, *path, interval);

  wrap->Ref();

}

void StatWatcher::Stop(const FunctionCallbackInfo<Value>& args) {

  HandleScope scope(node_isolate);

  StatWatcher* wrap = ObjectWrap::Unwrap<StatWatcher>(args.This());

  if (onstop_sym.IsEmpty()) {

    onstop_sym = String::New("onstop");

  }

  MakeCallback(wrap->handle(node_isolate), onstop_sym, 0, NULL);

  wrap->Stop();

}

void StatWatcher::Stop() {

  if (!uv_is_active(reinterpret_cast<uv_handle_t*>(watcher_))) return;

  uv_fs_poll_stop(watcher_);

  Unref();

}

}  // namespace node