ReadWriteLockTest

whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ReadWriteLockTest.java

+package org.hongxi.java.util.concurrent;
+
+import java.util.Random;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+/**
+ * @author shenhongxi 2019/8/12
+ */
+public class ReadWriteLockTest {
+
+    public static void main(String[] args) {
+        final Queue queue = new Queue();
+        final Random r = new Random();
+        for (int i = 0; i < 3; i++) {
+            new Thread(() -> queue.get()).start();
+            new Thread(() -> queue.put(r.nextInt(10000))).start();
+        }
+    }
+
+    static class Queue {
+        //共享数据，只能有一个线程能写该数据，但可以有多个线程同时读该数据。
+        private Object data = null;
+        ReadWriteLock rwl = new ReentrantReadWriteLock();
+
+        public void get() {
+            rwl.readLock().lock();
+            try {
+                System.out.println(Thread.currentThread().getName()
+                        + " be ready to read data!");
+                Thread.sleep((long) (Math.random() * 1000));
+                System.out.println(Thread.currentThread().getName()
+                        + "have read data :" + data);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            } finally {
+                rwl.readLock().unlock();
+            }
+        }
+
+        public void put(Object data) {
+            rwl.writeLock().lock();
+            try {
+                System.out.println(Thread.currentThread().getName()
+                        + " be ready to write data!");
+                Thread.sleep((long) (Math.random() * 1000));
+                this.data = data;
+                System.out.println(Thread.currentThread().getName()
+                        + " have write data: " + data);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            } finally {
+                rwl.writeLock().unlock();
+            }
+        }
+    }
+}