自定义责任链Filter实现

核心接口

Filter

package com.xxx.arch.mw.nbp.common.extension;

import com.xxx.commons.data.domain.Result;

/**
 * @date 2023/08/25
 */
public interface Filter {
    Result invoke(final Invoker invoker, final Invocation invocation);
}

Invoker

package com.xxx.arch.mw.nbp.common.extension;

import com.xxx.commons.data.domain.Result;

/**
 * @date 2023/08/25
 */
public interface Invoker {

    Result invoke(Invocation invocation);
}

Invocation

package com.xxx.arch.mw.nbp.common.extension;

import com.xxx.arch.mw.nbp.share.dto.PropertyDTO;

/**
 * @date 2023/08/25
 */
public interface Invocation {

    T getDetail();

    PropertyDTO getProperty();

    boolean isAsync();

}

关键类

FilterChain

package com.xxx.arch.mw.nbp.common.extension;


import com.xxx.arch.mw.nbp.common.annotation.DispatchFilter;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @date 2023/08/28
 */
public class FilterChain {

    private final List filters = new ArrayList<>();

    public FilterChain() {
    }

    public void addFilter(Filter filter) {
        if (filter == null || filter.getClass().getAnnotation(DispatchFilter.class) == null) {
            return;
        }
        if (this.filters.stream().noneMatch(existFilter -> existFilter.getClass().equals(filter.getClass()))) {
            this.filters.add(filter);
        }
    }

    public void removeFilter(String filterName) {
        this.filters.removeIf(filter -> filter.getClass().getAnnotation(DispatchFilter.class).value().equals(filterName));
    }

    public void removeFilter(Filter filter) {
        this.filters.removeIf(aFilter -> aFilter.getClass().equals(filter.getClass()));
    }

    public Invoker buildInvokerChain(final Invoker invoker) {

        Invoker last = invoker;
        if (!filters.isEmpty()) {
            this.sort();
            for (int i = filters.size() - 1; i >= 0; i--) {
                final Filter filter = filters.get(i);
                final Invoker next = last;
                last = invocation -> filter.invoke(next, invocation);
            }
        }
        return last;
    }

    public void sort() {
        Collections.sort(this.filters, FilterComparator.COMPARATOR);
    }

    public List getFilters() {
        return filters;
    }
}

FilterComparator

package com.xxx.arch.mw.nbp.common.extension;

import com.xxx.arch.mw.nbp.common.annotation.DispatchFilter;

import java.util.Comparator;

/**
 * @date 2023/08/28
 */
public class FilterComparator implements Comparator