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// Copyright (c) 2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_GREASEMONKEY_MASTER_H_
#define CHROME_BROWSER_GREASEMONKEY_MASTER_H_
#include "base/directory_watcher.h"
#include "base/process.h"
#include "base/scoped_ptr.h"
#include "base/shared_memory.h"
class MessageLoop;
// Manages a segment of shared memory that contains the Greasemonkey scripts the
// user has installed. Lives on the UI thread.
class GreasemonkeyMaster : public base::RefCounted<GreasemonkeyMaster>,
public DirectoryWatcher::Delegate {
public:
// For testability, the constructor takes the MessageLoop to run the
// script-reloading worker on as well as the path the scripts live in.
// These are normally the file thread and DIR_USER_SCRIPTS.
GreasemonkeyMaster(MessageLoop* worker, const FilePath& script_dir);
~GreasemonkeyMaster();
// Gets the segment of shared memory for the scripts.
base::SharedMemory* GetSharedMemory() const {
return shared_memory_.get();
}
// Called by the script reloader when new scripts have been loaded.
void NewScriptsAvailable(base::SharedMemory* handle);
// Return true if we have any scripts ready.
bool ScriptsReady() const { return shared_memory_.get() != NULL; }
private:
class ScriptReloader;
// DirectoryWatcher::Delegate implementation.
virtual void OnDirectoryChanged(const FilePath& path);
// Kicks off a process on the file thread to reload scripts from disk
// into a new chunk of shared memory and notify renderers.
void StartScan();
// The directory containing user scripts.
scoped_ptr<FilePath> user_script_dir_;
// The watcher watches the profile's user scripts directory for new scripts.
scoped_ptr<DirectoryWatcher> dir_watcher_;
// The MessageLoop that the scanner worker runs on.
// Typically the file thread; configurable for testing.
MessageLoop* worker_loop_;
// ScriptReloader (in another thread) reloads script off disk.
// We hang on to our pointer to know if we've already got one running.
scoped_refptr<ScriptReloader> script_reloader_;
// Contains the scripts that were found the last time scripts were updated.
scoped_ptr<base::SharedMemory> shared_memory_;
// If the script directory is modified while we're rescanning it, we note
// that we're currently mid-scan and then start over again once the scan
// finishes. This boolean tracks whether another scan is pending.
bool pending_scan_;
DISALLOW_COPY_AND_ASSIGN(GreasemonkeyMaster);
};
#endif // CHROME_BROWSER_GREASEMONKEY_MASTER_H_
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