File: PAsmJSCacheEntry.ipdl

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

include protocol PBackground;

using mozilla::dom::asmjscache::Metadata from "mozilla/dom/asmjscache/AsmJSCache.h";
using JS::AsmJSCacheResult from "mozilla/dom/asmjscache/AsmJSCache.h";

namespace mozilla {
namespace dom {
namespace asmjscache {

union OpenMetadataForReadResponse
{
  AsmJSCacheResult;
  uint32_t;
};

protocol PAsmJSCacheEntry
{
  manager PBackground;

  // When the cache is opened to read, the parent process sends over the
  // origin's Metadata so the child process can select the cache entry to open
  // (based on hash) and notify the parent (via SelectCacheFileToRead).
child:
  async OnOpenMetadataForRead(Metadata metadata);
parent:
  async SelectCacheFileToRead(OpenMetadataForReadResponse response);

child:
  // Once the cache file has been opened, the child is notified and sent an
  // open file descriptor.
  async OnOpenCacheFile(int64_t fileSize, FileDescriptor fileDesc);

parent:
  // When the child process is done with the cache entry, the parent process
  // is notified (via Close).
  async Close();

child:
  // When there's an error during the opening phase, the child process is
  // notified (via __delete__) and sent an error result.
  // When the parent process receives the Close message, it closes the cache
  // entry on the parent side and the child is notified (via __delete__).
  // The protocol is destroyed in both cases.
  async __delete__(AsmJSCacheResult result);
};

} // namespace asmjscache
} // namespace dom
} // namespace mozilla