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Cattle framework cloud discovery common component pom

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/*
 * Copyright (C) 2018 the original author or authors.
 *
 * 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.
 */
package org.cattleframework.cloud.discovery.enhancement.context;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.collections4.MapUtils;
import org.apache.commons.lang3.StringUtils;
import org.cattleframework.aop.context.SpringContext;

/**
 * 数据上下文持有者
 * 
 * @author orange
 *
 */
public final class DataContextHolder {

    private static final ThreadLocal DATA_CONTEXT = new InheritableThreadLocal();

    private static StaticDataManager staticDataManager;

    private DataContextHolder() {
    }

    public static DataContext get() {
	if (DATA_CONTEXT.get() != null) {
	    return DATA_CONTEXT.get();
	}
	if (staticDataManager == null) {
	    staticDataManager = SpringContext.get().getBeanFactory().getBean(StaticDataManager.class);
	}
	DataContext dataContext = new DataContext();
	dataContext.setTransitiveMetadata(staticDataManager.getMergedStaticTransitiveMetadata());
	dataContext.setDisposableMetadata(staticDataManager.getMergedStaticDisposableMetadata());
	String transHeader = staticDataManager.getTransHeader();
	if (StringUtils.isNotBlank(transHeader)) {
	    dataContext.setTransHeaders(transHeader, "");
	}
	DATA_CONTEXT.set(dataContext);
	return DATA_CONTEXT.get();
    }

    public static void init(Map dynamicTransitiveMetadata,
	    Map dynamicDisposableMetadata) {
	remove();
	DataContext dataContext = get();
	if (MapUtils.isNotEmpty(dynamicTransitiveMetadata)) {
	    Map staticTransitiveMetadata = dataContext.getTransitiveMetadata();
	    Map mergedTransitiveMetadata = new HashMap(0);
	    mergedTransitiveMetadata.putAll(staticTransitiveMetadata);
	    mergedTransitiveMetadata.putAll(dynamicTransitiveMetadata);
	    dataContext.setTransitiveMetadata(Collections.unmodifiableMap(mergedTransitiveMetadata));
	}
	if (MapUtils.isNotEmpty(dynamicDisposableMetadata)) {
	    Map mergedUpstreamDisposableMetadata = new HashMap<>(dynamicDisposableMetadata);
	    dataContext.setUpstreamDisposableMetadata(Collections.unmodifiableMap(mergedUpstreamDisposableMetadata));
	}
	Map staticDisposableMetadata = dataContext.getDisposableMetadata();
	dataContext.setDisposableMetadata(Collections.unmodifiableMap(staticDisposableMetadata));
	set(dataContext);
    }

    public static void set(DataContext dataContext) {
	DATA_CONTEXT.set(dataContext);
    }

    public static void remove() {
	DATA_CONTEXT.remove();
    }
}