责任链模式-Chain of Responsibility(Java实现), 例2
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2022-08-28 16:21:49
责任链模式, Chain of Responsibility, Java实现 ......
责任链模式-Chain of Responsibility
在这种模式中,通常每个接收者都包含对另一个接收者的引用。如果一个对象不能处理该请求,那么它会把相同的请求传给下一个接收者,依此类推。
咱们在这里换一个场景:
国王(King类), 经常会遇到各种麻烦(Trouble类), 而国王一旦遇到麻烦, 则会把麻烦交给手下去做.
国王有一天上了战场, 任务法派的顺序是这样的, 骑兵先上, 骑兵不行步兵上, 步兵不行就换贴身侍卫上.
TroubleType枚举
在这里枚举了, 国王在战场上有三种事情会分派给手下去做
public enum TroubleType { DEFEND, ATTACK, PROTECT }
Trouble类
这里是国王分配的事情
public class Trouble { private final TroubleType troubleType; private final String requestDescription; public Trouble(final TroubleType troubleType, final String requestDescription) { this.troubleType = Objects.requireNonNull(troubleType); this.requestDescription = Objects.requireNonNull(requestDescription); } public String getRequestDescription() { return requestDescription; } public TroubleType getRequestType() { return troubleType; } @Override public String toString() { return getRequestDescription(); } }
Support抽象类
国王的手下解决Trouble都会实现这个Support借口, Support借口是解决Trouble的统一定义
public abstract class Support { private Support next; public Support(Support next) { this.next = next; } public void handleRequest(Trouble trouble) { if (next != null) { next.handleRequest(trouble); } } protected void printHandling(Trouble trouble) { System.out.printf("%s 执行任务: %s\n", this, trouble); } @Override public abstract String toString(); }
RiderSupport类
骑兵在本例子中只负责进攻
public class RiderSupport extends Support { public RiderSupport(Support support) { super(support); } @Override public void handleRequest(Trouble trouble) { if (trouble.getRequestType().equals(TroubleType.ATTACK)) { printHandling(trouble); } else { super.handleRequest(trouble); } } @Override public String toString() { return "Rider"; } }
SolderSupport类
步兵在本例子中只负责防守
public class SolderSupport extends Support { public SolderSupport(Support support) { super(support); } @Override public void handleRequest(Trouble trouble) { if (trouble.getRequestType().equals(TroubleType.DEFEND)) { printHandling(trouble); } else { super.handleRequest(trouble); } } @Override public String toString() { return "Soldier"; } }
GuardSupport类
本类负责保卫国王
public class GuardSupport extends Support { public GuardSupport(Support next) { super(next); } @Override public void handleRequest(Trouble trouble) { if (trouble.getRequestType().equals(TroubleType.PROTECT)) { printHandling(trouble); } else { super.handleRequest(trouble); } } @Override public String toString() { return "Guard"; } }
King类
本类负责维护责任链.
public class King { private Support chain; public King() { buildChain(); } private void buildChain() { chain = new RiderSupport(new SolderSupport(new GuardSupport(null))); } public void resolve(Trouble trouble) { chain.handleRequest(trouble); } }
Main
运行测试
public class Main { public static void main(String[] args) { King king = new King(); king.resolve(new Trouble(TroubleType.DEFEND, "防御")); king.resolve(new Trouble(TroubleType.ATTACK, "进攻")); king.resolve(new Trouble(TroubleType.PROTECT, "保护国王")); } }
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