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package io.nuls.core.thread.commom;

import java.util.*;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author tag
 */
public class ThreadCache {
    private static ThreadCache INSTANCE = null;

    /**
     * key  :  poolName
     * value:  pool
     */
    private final Map POOL_EXECUTOR_MAP = new HashMap<>();

    /**
     * key  :  threadName
     * value:  thread
     */
    private final Map THREAD_MAP = new HashMap<>();

    /**
     * key  :  poolName
     * value:  Set
     */
    private final Map> POOL_THREAD_MAP = new HashMap<>();

    private ThreadCache() {
    }

    public static final ThreadCache getInstance() {
        if (INSTANCE == null) {
            synchronized (ThreadCache.class) {
                if (INSTANCE == null) {
                    INSTANCE = new ThreadCache();
                }
            }
        }
        return INSTANCE;
    }

    public final void putPool(String poolName, ThreadPoolExecutor pool) {
        POOL_EXECUTOR_MAP.put(poolName, pool);
    }

    public final void putThread(String poolName, String threadName, Thread thread) {
        THREAD_MAP.put(threadName, thread);
        Set set = POOL_THREAD_MAP.get(poolName);
        if (null == set) {
            set = new HashSet<>();
        }
        set.add(threadName);
        POOL_THREAD_MAP.put(poolName, set);
    }

    public final Thread getThread(String threadName) {
        return THREAD_MAP.get(threadName);
    }

    public final ThreadPoolExecutor getPool(String poolName) {
        return POOL_EXECUTOR_MAP.get(poolName);
    }

    public final List getThreadList() {
        return new ArrayList(THREAD_MAP.values());
    }

    public final List getThreadList(String poolName) {
        Set set = POOL_THREAD_MAP.get(poolName);
        if (null == set) {
            return null;
        }
        List list = new ArrayList<>();
        for (String threadName : set) {
            list.add(THREAD_MAP.get(threadName));
        }
        return list;
    }

    public final List getPoolList() {
        return new ArrayList<>(POOL_EXECUTOR_MAP.values());
    }

    public void removeAllThread() {
        THREAD_MAP.clear();
        POOL_EXECUTOR_MAP.clear();
        POOL_THREAD_MAP.clear();
    }

    public void removePoolThread(String poolName) {
        POOL_THREAD_MAP.remove(poolName);
    }

    public void removeThread(String threadName) {
        THREAD_MAP.remove(threadName);
        for (Set tset : POOL_THREAD_MAP.values()) {
            tset.remove(threadName);
        }
    }
}