' Copyright (c) 2021-2022 Huawei Device Co., Ltd.
' Licensed under the Apache License, Version 2.0 (the "License");
' you may not use this file except in compliance with the License.
' You may obtain a copy of the License at
'
' http://www.apache.org/licenses/LICENSE-2.0
'
' Unless required by applicable law or agreed to in writing, software
' distributed under the License is distributed on an "AS IS" BASIS,
' WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
' See the License for the specific language governing permissions and
' limitations under the License.

@startuml
start

skinparam monochrome true

title Process references

if (The reason of GC is not OOM) then(Yes)
    :Mark soft references(see Marking phase);
endif

:ClearFinalizeReferences(see FinalizerDaemon);

while (while SoftReferenceQueue, WeakReferenceQueue, PhantomReferenceQueue not processed)
    while (Queue is not empty)
        :Get object from the Queue;
        if (The referent object is marked or processed already) then(Yes)
        else (No)
            :referent = null;
            :Add the object to cleared_references;
        endif
    endwhile
endwhile

:enqueue cleared_references to be processed via ReferenceQueue(Java);

stop
@enduml