65 lines
2.5 KiB
Java
65 lines
2.5 KiB
Java
/*
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* The MIT License (MIT)
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*
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* Copyright © 2020 xrv <xrg@live.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package io.github.ehlxr.did.serializer;
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import io.github.ehlxr.did.common.Constants;
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import io.github.ehlxr.did.extension.ExtensionLoader;
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import io.netty.util.internal.StringUtil;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Objects;
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/**
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* @author ehlxr
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* @since 2021-02-08 22:12.
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*/
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public final class SerializerHolder {
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private static final Logger logger = LoggerFactory.getLogger(SerializerHolder.class);
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private volatile static Serializer serializer = null;
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private SerializerHolder() {
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}
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public static Serializer get() {
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if (serializer == null) {
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synchronized (SerializerHolder.class) {
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if (serializer == null) {
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String serializerName = Constants.getEnv("DID_SERIALIZER");
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if (!StringUtil.isNullOrEmpty(serializerName)) {
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serializer = ExtensionLoader.getExtensionLoader(Serializer.class).getExtension(serializerName);
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}
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serializer = Objects.isNull(serializer) ?
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ExtensionLoader.getExtensionLoader(Serializer.class).getDefaultExtension() :
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serializer;
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logger.debug("loaded {} serializer", serializer.getClass().getName());
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}
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}
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}
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return serializer;
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}
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}
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