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package org.macrocloud.kernel.toolkit.utils;

import io.protostuff.LinkedBuffer;
import io.protostuff.ProtostuffIOUtil;
import io.protostuff.Schema;
import io.protostuff.runtime.RuntimeSchema;

import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;


/**
 * Protostuff 工具类.
 *
 * @author macro
 */
public class ProtostuffUtil {

	/** 避免每次序列化都重新申请Buffer空间. */
	private static final LinkedBuffer BUFFER = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
	
	/** 缓存Schema. */
	private static final Map, Schema> SCHEMA_CACHE = new ConcurrentHashMap<>();

	/**
	 * 序列化方法，把指定对象序列化成字节数组.
	 *
	 * @param  T
	 * @param obj obj
	 * @return byte[]
	 */
	@SuppressWarnings("unchecked")
	public static  byte[] serialize(T obj) {
		Class clazz = (Class) obj.getClass();
		Schema schema = getSchema(clazz);
		byte[] data;
		try {
			data = ProtostuffIOUtil.toByteArray(obj, schema, BUFFER);
		} finally {
			BUFFER.clear();
		}
		return data;
	}

	/**
	 * 反序列化方法，将字节数组反序列化成指定Class类型.
	 *
	 * @param  T
	 * @param data data
	 * @param clazz clazz
	 * @return T
	 */
	public static  T deserialize(byte[] data, Class clazz) {
		Schema schema = getSchema(clazz);
		T obj = schema.newMessage();
		ProtostuffIOUtil.mergeFrom(data, obj, schema);
		return obj;
	}

	/**
	 * 获取Schema.
	 *
	 * @param  T
	 * @param clazz clazz
	 * @return T
	 */
	@SuppressWarnings("unchecked")
	private static  Schema getSchema(Class clazz) {
		Schema schema = (Schema) SCHEMA_CACHE.get(clazz);
		if (Objects.isNull(schema)) {
			//这个schema通过RuntimeSchema进行懒创建并缓存
			//所以可以一直调用RuntimeSchema.getSchema(),这个方法是线程安全的
			schema = RuntimeSchema.getSchema(clazz);
			if (Objects.nonNull(schema)) {
				SCHEMA_CACHE.put(clazz, schema);
			}
		}
		return schema;
	}

}