design/designer-base/src/main/java/com/fr/env/detect/impl/DetectorChain.java

package com.fr.env.detect.impl;

import com.fr.env.detect.base.ExceptionDetector;
import com.fr.env.detect.bean.DetectorResult;
import com.fr.env.detect.bean.DetectorStatus;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 检测链
 * 责任链模式， 有先后顺序，哪一个先获得，哪一个先终止。
 *
 * created by Harrison on 2022/06/16
 **/
public class DetectorChain {
    
    private List<ExceptionDetector> detectors = new ArrayList<>();
    
    public static DetectorChain construct(ExceptionDetector... detectors) {
    
        DetectorChain detectorChain = new DetectorChain();
        detectorChain.detectors = Arrays.stream(detectors).collect(Collectors.toList());
        return detectorChain;
    }
    
    @Nullable
    public DetectorResult detect() {
    
        for (ExceptionDetector detector : detectors) {
            DetectorResult result = detector.detect();
            if (result != null && result.getStatus() == DetectorStatus.EXCEPTION) {
                return result;
            }
        }
        return null;
    }
    
    public List<ExceptionDetector> getDetectors() {
    
        return this.detectors;
    }
}