1 files changed, 99 insertions, 0 deletions
diff --git a/chrome/browser/cancelable_request.cc b/chrome/browser/cancelable_request.cc
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+++ b/chrome/browser/cancelable_request.cc
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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())
+    CancelRequest(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_);
+
+  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);
+}