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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "chrome/browser/cancelable_request.h"
CancelableRequestProvider::CancelableRequestProvider() : next_handle_(1) {
}
CancelableRequestProvider::~CancelableRequestProvider() {
// There may be requests whose result callback has not been run yet. We need
// to cancel them otherwise they may try and call us back after we've been
// deleted, or do other bad things. This can occur on shutdown (or profile
// destruction) when a request is scheduled, completed (but not dispatched),
// then the Profile is deleted.
AutoLock lock(pending_request_lock_);
while (!pending_requests_.empty())
CancelRequestLocked(pending_requests_.begin()->first);
}
CancelableRequestProvider::Handle CancelableRequestProvider::AddRequest(
CancelableRequestBase* request,
CancelableRequestConsumerBase* consumer) {
Handle handle;
{
AutoLock lock(pending_request_lock_);
handle = next_handle_;
pending_requests_[next_handle_] = request;
++next_handle_;
}
consumer->OnRequestAdded(this, handle);
request->Init(this, handle, consumer);
return handle;
}
void CancelableRequestProvider::CancelRequest(Handle handle) {
AutoLock lock(pending_request_lock_);
CancelRequestLocked(handle);
}
void CancelableRequestProvider::CancelRequestLocked(Handle handle) {
CancelableRequestMap::iterator i = pending_requests_.find(handle);
if (i == pending_requests_.end()) {
NOTREACHED() << "Trying to cancel an unknown request";
return;
}
i->second->consumer()->OnRequestRemoved(this, handle);
i->second->set_canceled();
pending_requests_.erase(i);
}
void CancelableRequestProvider::RequestCompleted(Handle handle) {
CancelableRequestConsumerBase* consumer;
{
AutoLock lock(pending_request_lock_);
CancelableRequestMap::iterator i = pending_requests_.find(handle);
if (i == pending_requests_.end()) {
NOTREACHED() << "Trying to cancel an unknown request";
return;
}
consumer = i->second->consumer();
// This message should only get sent if the class is not cancelled, or
// else the consumer might be gone).
DCHECK(!i->second->canceled());
pending_requests_.erase(i);
}
// Notify the consumer that the request is gone
consumer->OnRequestRemoved(this, handle);
}
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