RedCore/cocos2d/cocos/network/CCDownloader-android.cpp

/****************************************************************************
 Copyright (c) 2015-2017 Chukong Technologies Inc.

 http://www.cocos2d-x.org

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 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.

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#include "network/CCDownloader-android.h"

#include "network/CCDownloader.h"
#include "platform/android/jni/JniHelper.h"

#include <mutex>

#define JCLS_DOWNLOADER "org/cocos2dx/lib/Cocos2dxDownloader"
#define JCLS_TASK       "com/loopj/android/http/RequestHandle"
#define JARG_STR        "Ljava/lang/String;"
#define JARG_DOWNLOADER "L" JCLS_DOWNLOADER ";"
#define JARG_TASK       "L" JCLS_TASK ";"

using namespace std;

static bool _registerNativeMethods(JNIEnv* env);

unordered_map<int, cocos2d::network::DownloaderAndroid*> sDownloaderMap;
std::mutex sDownloaderMutex;

static void _insertDownloaderAndroid(int id, cocos2d::network::DownloaderAndroid* downloaderPtr)
{
    std::lock_guard<std::mutex> guard(sDownloaderMutex);
    sDownloaderMap.insert(make_pair(id, downloaderPtr));
}

static void _eraseDownloaderAndroid(int id)
{
    std::lock_guard<std::mutex> guard(sDownloaderMutex);
    sDownloaderMap.erase(id);
}

/**
 * If not found, return nullptr, otherwise return the Downloader
 */
static cocos2d::network::DownloaderAndroid* _findDownloaderAndroid(int id)
{
    std::lock_guard<std::mutex> guard(sDownloaderMutex);
    auto iter = sDownloaderMap.find(id);
    if (sDownloaderMap.end() == iter) {
        return nullptr;
    } else {
        return iter->second;
    }
}

namespace cocos2d { namespace network {

        static int sTaskCounter;
        static int sDownloaderCounter;
        static bool _registered = false;

        struct DownloadTaskAndroid : public IDownloadTask
        {
            DownloadTaskAndroid()
            :id(++sTaskCounter)
            {
                DLLOG("Construct DownloadTaskAndroid: %p", this);
            }
            virtual  ~DownloadTaskAndroid()
            {
                DLLOG("Destruct DownloadTaskAndroid: %p", this);
            }

            int id;
            shared_ptr<const DownloadTask> task;    // reference to DownloadTask, when task finish, release
        };

        DownloaderAndroid::DownloaderAndroid(const DownloaderHints& hints)
        : _id(++sDownloaderCounter)
        , _impl(nullptr)
        {
            DLLOG("Construct DownloaderAndroid: %p", this);
            JniMethodInfo methodInfo;
            if (JniHelper::getStaticMethodInfo(methodInfo,
                                               JCLS_DOWNLOADER,
                                               "createDownloader",
                                               "(II" JARG_STR "I)" JARG_DOWNLOADER))
            {
                jobject jStr = methodInfo.env->NewStringUTF(hints.tempFileNameSuffix.c_str());
                jobject jObj = methodInfo.env->CallStaticObjectMethod(
                        methodInfo.classID,
                        methodInfo.methodID,
                        _id,
                        hints.timeoutInSeconds,
                        jStr,
                        hints.countOfMaxProcessingTasks
                );
                _impl = methodInfo.env->NewGlobalRef(jObj);
                DLLOG("android downloader: jObj: %p, _impl: %p", jObj, _impl);
                //It's not thread-safe here, use thread-safe method instead
                //sDownloaderMap.insert(make_pair(_id, this));
                _insertDownloaderAndroid(_id, this);
                methodInfo.env->DeleteLocalRef(jStr);
                methodInfo.env->DeleteLocalRef(jObj);
                methodInfo.env->DeleteLocalRef(methodInfo.classID);
            }
        }

        DownloaderAndroid::~DownloaderAndroid()
        {
            if(_impl != nullptr)
            {
                JniMethodInfo methodInfo;
                if (JniHelper::getStaticMethodInfo(methodInfo,
                                                   JCLS_DOWNLOADER,
                                                   "cancelAllRequests",
                                                   "(" JARG_DOWNLOADER ")V"))
                {
                    methodInfo.env->CallStaticVoidMethod(
                            methodInfo.classID,
                            methodInfo.methodID,
                            _impl
                    );
                    methodInfo.env->DeleteLocalRef(methodInfo.classID);
                }
                //It's not thread-safe here, use thread-safe method instead
                //sDownloaderMap.erase(_id);
                _eraseDownloaderAndroid(_id);
                JniHelper::getEnv()->DeleteGlobalRef(_impl);
            }
            DLLOG("Destruct DownloaderAndroid: %p", this);
        }

        IDownloadTask *DownloaderAndroid::createCoTask(std::shared_ptr<const DownloadTask>& task)
        {
            DownloadTaskAndroid *coTask = new DownloadTaskAndroid;
            coTask->task = task;

            JniMethodInfo methodInfo;
            if (JniHelper::getStaticMethodInfo(methodInfo,
                                               JCLS_DOWNLOADER,
                                               "createTask",
                                               "(" JARG_DOWNLOADER "I" JARG_STR JARG_STR")V"))
            {
                jstring jstrURL = methodInfo.env->NewStringUTF(task->requestURL.c_str());
                jstring jstrPath= methodInfo.env->NewStringUTF(task->storagePath.c_str());
                methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, _impl, coTask->id, jstrURL, jstrPath);
                methodInfo.env->DeleteLocalRef(jstrURL);
                methodInfo.env->DeleteLocalRef(jstrPath);
                methodInfo.env->DeleteLocalRef(methodInfo.classID);
            }

            DLLOG("DownloaderAndroid::createCoTask id: %d", coTask->id);
            _taskMap.insert(make_pair(coTask->id, coTask));
            return coTask;
        }

        void DownloaderAndroid::_onProcess(int taskId, int64_t dl, int64_t dlNow, int64_t dlTotal)
        {
            DLLOG("DownloaderAndroid::onProgress(taskId: %d, dl: %lld, dlnow: %lld, dltotal: %lld)", taskId, dl, dlNow, dlTotal);
            auto iter = _taskMap.find(taskId);
            if (_taskMap.end() == iter)
            {
                DLLOG("DownloaderAndroid::onProgress can't find task with id: %d", taskId);
                return;
            }
            DownloadTaskAndroid *coTask = iter->second;
            function<int64_t(void*, int64_t)> transferDataToBuffer;
            onTaskProgress(*coTask->task, dl, dlNow, dlTotal, transferDataToBuffer);
        }

        void DownloaderAndroid::_onFinish(int taskId, int errCode, const char *errStr, vector<unsigned char>& data)
        {
            DLLOG("DownloaderAndroid::_onFinish(taskId: %d, errCode: %d, errStr: %s)", taskId, errCode, (errStr)?errStr:"null");
            auto iter = _taskMap.find(taskId);
            if (_taskMap.end() == iter)
            {
                DLLOG("DownloaderAndroid::_onFinish can't find task with id: %d", taskId);
                return;
            }
            DownloadTaskAndroid *coTask = iter->second;
            string str = (errStr ? errStr : "");
            _taskMap.erase(iter);
            onTaskFinish(*coTask->task,
                         errStr ? DownloadTask::ERROR_IMPL_INTERNAL : DownloadTask::ERROR_NO_ERROR,
                         errCode,
                         str,
                         data
            );
            coTask->task.reset();
        }


        void _preloadJavaDownloaderClass()
        {
            if(!_registered)
            {
                _registered = _registerNativeMethods(JniHelper::getEnv());
            }
        }
    }
}  // namespace cocos2d::network

static void _nativeOnProgress(JNIEnv *env, jclass clazz, jint id, jint taskId, jlong dl, jlong dlnow, jlong dltotal)
{
    DLLOG("_nativeOnProgress(id: %d, taskId: %d, dl: %lld, dlnow: %lld, dltotal: %lld)", id, taskId, dl, dlnow, dltotal);
    //It's not thread-safe here, use thread-safe method instead
    cocos2d::network::DownloaderAndroid *downloader = _findDownloaderAndroid(id);
    if (nullptr == downloader)
    {
        DLLOG("_nativeOnProgress can't find downloader by key: %p for task: %d", clazz, id);
        return;
    }
    downloader->_onProcess((int)taskId, (int64_t)dl, (int64_t)dlnow, (int64_t)dltotal);
}

static void _nativeOnFinish(JNIEnv *env, jclass clazz, jint id, jint taskId, jint errCode, jstring errStr, jbyteArray data)
{
    DLLOG("_nativeOnFinish(id: %d, taskId: %d)", id, taskId);
    //It's not thread-safe here, use thread-safe method instead
    cocos2d::network::DownloaderAndroid *downloader = _findDownloaderAndroid(id);
    if (nullptr == downloader)
    {
        DLLOG("_nativeOnFinish can't find downloader id: %d for task: %d", id, taskId);
        return;
    }
    vector<unsigned char> buf;
    if (errStr)
    {
        // failure
        const char *nativeErrStr = env->GetStringUTFChars(errStr, JNI_FALSE);
        downloader->_onFinish((int)taskId, (int)errCode, nativeErrStr, buf);
        env->ReleaseStringUTFChars(errStr, nativeErrStr);
        return;
    }

    // success
    if (data)
    {
        int len = env->GetArrayLength(data);
        if (len)
        {
            buf.reserve(len);
            buf.resize(len);
            env->GetByteArrayRegion(data, 0, len, reinterpret_cast<jbyte*>(buf.data()));
        }
    }
    downloader->_onFinish((int)taskId, (int)errCode, nullptr, buf);
}

static JNINativeMethod sMethodTable[] = {
        { "nativeOnProgress", "(IIJJJ)V", (void*)_nativeOnProgress },
        { "nativeOnFinish", "(III" JARG_STR "[B)V", (void*)_nativeOnFinish },
};

static bool _registerNativeMethods(JNIEnv* env)
{
    jclass clazz = env->FindClass(JCLS_DOWNLOADER);
    if (clazz == NULL)
    {
        DLLOG("_registerNativeMethods: can't find java class:%s", JARG_DOWNLOADER);
        return false;
    }
    if (JNI_OK != env->RegisterNatives(clazz, sMethodTable, sizeof(sMethodTable) / sizeof(sMethodTable[0])))
    {
        DLLOG("_registerNativeMethods: failed");
        if (env->ExceptionCheck())
        {
            env->ExceptionClear();
        }
        return false;
    }
    return true;
}