1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "webkit/browser/blob/blob_data_handle.h" 6 7 #include "base/bind.h" 8 #include "base/location.h" 9 #include "base/logging.h" 10 #include "base/sequenced_task_runner.h" 11 #include "webkit/browser/blob/blob_storage_context.h" 12 #include "webkit/common/blob/blob_data.h" 13 14 namespace webkit_blob { 15 16 BlobDataHandle::BlobDataHandle(BlobData* blob_data, BlobStorageContext* context, 17 base::SequencedTaskRunner* task_runner) 18 : blob_data_(blob_data), 19 context_(context->AsWeakPtr()), 20 io_task_runner_(task_runner) { 21 // Ensures the uuid remains registered and the underlying data is not deleted. 22 DCHECK(io_task_runner_->RunsTasksOnCurrentThread()); 23 context_->IncrementBlobRefCount(blob_data->uuid()); 24 blob_data_->AddRef(); 25 } 26 27 BlobDataHandle::~BlobDataHandle() { 28 if (io_task_runner_->RunsTasksOnCurrentThread()) { 29 // Note: Do not test context_ or alter the blob_data_ refcount 30 // on the wrong thread. 31 if (context_.get()) 32 context_->DecrementBlobRefCount(blob_data_->uuid()); 33 blob_data_->Release(); 34 return; 35 } 36 37 io_task_runner_->PostTask( 38 FROM_HERE, 39 base::Bind(&DeleteHelper, context_, base::Unretained(blob_data_))); 40 } 41 42 BlobData* BlobDataHandle::data() const { 43 DCHECK(io_task_runner_->RunsTasksOnCurrentThread()); 44 return blob_data_; 45 } 46 47 // static 48 void BlobDataHandle::DeleteHelper( 49 base::WeakPtr<BlobStorageContext> context, 50 BlobData* blob_data) { 51 if (context.get()) 52 context->DecrementBlobRefCount(blob_data->uuid()); 53 blob_data->Release(); 54 } 55 56 } // namespace webkit_blob 57
