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/*
* Copyright (C) 2006 The Android Open Source Project
*
* 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.
*/
/** \file
This file consists of implementation of a class AdbObjectHandle that
encapsulates an internal API object that is visible to the outside
of the API through a handle.
*/
#include "stdafx.h"
#include "adb_api.h"
#include "adb_object_handle.h"
/// Global ADBAPIHANDLE -> AdbObjectHandle* map
AdbObjectHandleMap the_map;
/// Locker for the AdbObjectHandleMap instance
CComAutoCriticalSection the_map_locker;
/// Next adb handle value generator
ULONG_PTR next_adb_handle_value = 0;
AdbObjectHandle::AdbObjectHandle(AdbObjectType obj_type)
: adb_handle_(NULL),
object_type_(obj_type),
ref_count_(1) {
ATLASSERT(obj_type < AdbObjectTypeMax);
}
AdbObjectHandle::~AdbObjectHandle() {
ATLASSERT(0 == ref_count_);
ATLASSERT(NULL == adb_handle_);
}
LONG AdbObjectHandle::AddRef() {
ATLASSERT(ref_count_ > 0);
return InterlockedIncrement(&ref_count_);
}
LONG AdbObjectHandle::Release() {
ATLASSERT(ref_count_ > 0);
LONG ret = InterlockedDecrement(&ref_count_);
ATLASSERT(ret >= 0);
if (0 == ret) {
LastReferenceReleased();
delete this;
}
return ret;
}
ADBAPIHANDLE AdbObjectHandle::CreateHandle() {
ADBAPIHANDLE ret = NULL;
// We have to hold this lock while we're dealing with the handle
// and the table
the_map_locker.Lock();
ATLASSERT(!IsOpened());
if (!IsOpened()) {
try {
// Generate next handle value
next_adb_handle_value++;
ret = reinterpret_cast<ADBAPIHANDLE>(next_adb_handle_value);
// Add ourselves to the map
the_map[ret] = this;
// Save handle, addref and return
adb_handle_ = ret;
AddRef();
} catch (...) {
ret = NULL;
SetLastError(ERROR_OUTOFMEMORY);
}
} else {
// Signaling that this object is already opened
SetLastError(ERROR_GEN_FAILURE);
}
the_map_locker.Unlock();
return ret;
}
bool AdbObjectHandle::CloseHandle() {
bool ret = false;
// Addref just in case that last reference to this object is being
// held in the map
AddRef();
the_map_locker.Lock();
ATLASSERT(IsOpened());
if (IsOpened()) {
try {
// Look us up in the map.
AdbObjectHandleMap::iterator found = the_map.find(adb_handle());
ATLASSERT((found != the_map.end()) && (this == found->second));
if ((found != the_map.end()) && (this == found->second)) {
// Remove ourselves from the map, close and release the object
the_map.erase(found);
adb_handle_ = NULL;
Release();
ret = true;
} else {
SetLastError(ERROR_INVALID_HANDLE);
}
} catch (...) {
ret = false;
SetLastError(ERROR_OUTOFMEMORY);
}
} else {
SetLastError(ERROR_INVALID_HANDLE);
}
the_map_locker.Unlock();
Release();
return ret;
}
bool AdbObjectHandle::IsObjectOfType(AdbObjectType obj_type) const {
return (obj_type == object_type());
}
void AdbObjectHandle::LastReferenceReleased() {
ATLASSERT(!IsOpened());
}
AdbObjectHandle* AdbObjectHandle::Lookup(ADBAPIHANDLE adb_hndl) {
AdbObjectHandle* ret = NULL;
the_map_locker.Lock();
try {
// Look us up in the map.
AdbObjectHandleMap::iterator found = the_map.find(adb_hndl);
if (found != the_map.end()) {
ret = found->second;
ret->AddRef();
}
} catch (...) {
SetLastError(ERROR_OUTOFMEMORY);
}
the_map_locker.Unlock();
return ret;
}
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