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/**
 * Tencent is pleased to support the open source community by making Tars available.
 *
 * Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * 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.
 */
package com.qq.tars.context;

import com.qq.tars.context.exc.CodecException;
import com.qq.tars.context.impl.DistributedContextImpl;

import java.util.Map;

public class DistributedContextManager {

    private static final DistributedContext context = new DistributedContextImpl();

    private static DistributedContextCodec _codec;

    private static boolean canCodec() {
        return _codec != null;
    }

    public static DistributedContext getDistributedContext() {
        return context;
    }

    public static void releaseDistributedContext() {
        getDistributedContext().clear();
    }

    public static void setDistributedContextCodec(DistributedContextCodec codec) {
        _codec = codec;
    }

    public static byte[] serializeContext2Bytes() throws CodecException {
        if (canCodec()) {
            return _codec.context2Bytes(getDistributedContext().getAttributes());
        } else {
            throw new CodecException("codec is null");
        }
    }

    public static void deserializeBytes2Context(byte[] src) throws CodecException {
        if (canCodec()) {
            Map attributes = _codec.loadBytes(src);
            for (Map.Entry attribute : attributes.entrySet()) {
                getDistributedContext().put(attribute.getKey(), attribute.getValue());
            }
        } else {
            throw new CodecException("codec is null");
        }
    }

    public static String serializeContext2String() throws CodecException {
        if (canCodec()) {
            return _codec.context2String(getDistributedContext().getAttributes());
        } else {
            throw new CodecException("codec is null");
        }
    }

    public static void deserializeString2Context(String src) throws CodecException {
        if (canCodec()) {
            Map attributes = _codec.loadString(src);
            for (Map.Entry attribute : attributes.entrySet()) {
                getDistributedContext().put(attribute.getKey(), attribute.getValue());
            }
        } else {
            throw new CodecException("codec is null");
        }
    }

}