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  • 线程上下文

    //设计为单例
    public final class ActionContext {
    
        // 构造方法私有化
        private ActionContext() {
    
        }
    
        // Holder类
        private static class ContextHolder {
            private final static ActionContext actionContext = new ActionContext();
    
        }
    
        // 提供给外部使用
        public static ActionContext getActionContext() {
            return ContextHolder.actionContext;
        }
    
        // 属性
        public Context getContext() {
            return threadLocal.get();
        }
    
        // 属性
        private final ThreadLocal<Context> threadLocal = new ThreadLocal<Context>() {
            @Override
            protected Context initialValue() {
                return new Context();
            }
        };
    
    }
    
    
    public class Context {
    
        private String name;
        private String cardId;
    
        public String getCardId() {
            return cardId;
        }
    
        public void setCardId(String cardId) {
            this.cardId = cardId;
        }
    
        public String getName() {
            return this.name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    }
    
    
    public class ExecutionTask implements Runnable {
    
        private QueryFromDBAction queryAction = new QueryFromDBAction();
    
        private QueryFromHttpAction httpAction = new QueryFromHttpAction();
    
        @Override
        public void run() {
    
            queryAction.execute();
            System.out.println("The name query successful");
            httpAction.execute();
            System.out.println("The cardId query successful");
    
            Context context = ActionContext.getActionContext().getContext();
            System.out.println("The Name is " + context.getName() + " and CardId  is " + context.getCardId());
        }
    }
    
    public class QueryFromDBAction {
    
        public void execute() {
    
            try {
                Thread.sleep(1000L);
                String name = Thread.currentThread().getName() +"中的Jack";
                ActionContext.getActionContext().getContext().setName(name);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    
    public class QueryFromHttpAction {
    
        public void execute() {
            Context context = ActionContext.getActionContext().getContext();
            String name = context.getName();
            String cardId = getCardId(name);
            context.setCardId(cardId);
    
    
        }
    
        private String getCardId(String name) {
            try {
                Thread.sleep(1000L);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return Thread.currentThread().getName()+"中的cardId";
        }
    }
    
    public class ContextTest {
    
        public static void main(String[] args) {
    
            IntStream.rangeClosed(1, 4)
                    .forEach(i ->
                            new Thread(new ExecutionTask(),"【线程"+i+"").start()
                    );
        }
    }
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  • 原文地址:https://www.cnblogs.com/moris5013/p/11779477.html
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