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// Copyright (c) 2011 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 NET_URL_REQUEST_URL_REQUEST_JOB_TRACKER_H_
#define NET_URL_REQUEST_URL_REQUEST_JOB_TRACKER_H_
#pragma once
#include <vector>
#include "base/observer_list.h"
#include "net/url_request/url_request_status.h"
class GURL;
namespace net {
class URLRequestJob;
// This class maintains a list of active URLRequestJobs for debugging purposes.
// This allows us to warn on leaked jobs and also allows an observer to track
// what is happening, for example, for the network status monitor.
//
// NOTE: URLRequest is single-threaded, so this class should only be used
// onthe same thread where all of the application's URLRequest calls are
// made.
//
class URLRequestJobTracker {
public:
typedef std::vector<URLRequestJob*> JobList;
typedef JobList::const_iterator JobIterator;
// The observer's methods are called on the thread that called AddObserver.
class JobObserver {
public:
virtual ~JobObserver() {}
// Called after the given job has been added to the list
virtual void OnJobAdded(URLRequestJob* job) = 0;
// Called after the given job has been removed from the list
virtual void OnJobRemoved(URLRequestJob* job) = 0;
// Called when the given job has completed, before notifying the request
virtual void OnJobDone(URLRequestJob* job,
const URLRequestStatus& status) = 0;
// Called when the given job is about to follow a redirect to the given
// new URL. The redirect type is given in status_code
virtual void OnJobRedirect(URLRequestJob* job, const GURL& location,
int status_code) = 0;
// Called when a new chunk of unfiltered bytes has been read for
// the given job. |byte_count| is the number of bytes for that
// read event only. |buf| is a pointer to the data buffer that
// contains those bytes. The data in |buf| is only valid for the
// duration of the OnBytesRead callback.
virtual void OnBytesRead(URLRequestJob* job, const char* buf,
int byte_count) = 0;
};
URLRequestJobTracker();
~URLRequestJobTracker();
// adds or removes an observer from the list. note, these methods should
// only be called on the same thread where URLRequest objects are used.
void AddObserver(JobObserver* observer) {
observers_.AddObserver(observer);
}
void RemoveObserver(JobObserver* observer) {
observers_.RemoveObserver(observer);
}
// adds or removes the job from the active list, should be called by the
// job constructor and destructor. Note: don't use "AddJob" since that
// is #defined by windows.h :(
void AddNewJob(URLRequestJob* job);
void RemoveJob(URLRequestJob* job);
// Job status change notifications
void OnJobDone(URLRequestJob* job, const URLRequestStatus& status);
void OnJobRedirect(URLRequestJob* job, const GURL& location,
int status_code);
// Bytes read notifications.
void OnBytesRead(URLRequestJob* job, const char* buf, int byte_count);
// allows iteration over all active jobs
JobIterator begin() const {
return active_jobs_.begin();
}
JobIterator end() const {
return active_jobs_.end();
}
private:
ObserverList<JobObserver> observers_;
JobList active_jobs_;
};
extern URLRequestJobTracker g_url_request_job_tracker;
} // namespace net
#endif // NET_URL_REQUEST_URL_REQUEST_JOB_TRACKER_H_
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