update at 2019-07-19 14:14:12 by ehlxr

src/main/java/me/ehlxr/BarrierTest.java

@@ -1,64 +0,0 @@
-package me.ehlxr;
-
-import com.google.common.collect.Lists;
-
-import java.util.Collections;
-import java.util.List;
-import java.util.concurrent.atomic.AtomicInteger;
-
-/**
- * 按比例控制流量
- *
- * @author lixiangrong
- * @since 2019-07-18.
- */
-public class BarrierTest {
-    public static void main(String[] args) {
-        Barrier barrier = new Barrier(10, 3);
-
-        final Thread[] threads = new Thread[20];
-        for (int i = 0; i < threads.length; i++) {
-            threads[i] = new Thread(() -> {
-                if (barrier.allow()) {
-                    System.out.println("yes");
-                }
-            });
-            threads[i].start();
-        }
-
-        for (Thread t : threads) {
-            try {
-                t.join();
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
-        }
-
-    }
-}
-
-class Barrier {
-    private AtomicInteger op = new AtomicInteger(0);
-    private List<Integer> sources = Lists.newArrayList();
-    private int base;
-    private int rate;
-
-    public boolean allow() {
-        return sources.get(op.incrementAndGet() % base) < rate;
-    }
-
-    private Barrier() {
-    }
-
-    public Barrier(int base, int rate) {
-        this.base = base;
-        this.rate = rate;
-
-        for (int i = 0; i < 10; i++) {
-            sources.add(i);
-        }
-        Collections.shuffle(sources);
-    }
-
-}
-

src/main/java/me/ehlxr/rate/Main.java

@@ -0,0 +1,57 @@
+package me.ehlxr.rate;
+
+/**
+ * @author lixiangrong
+ * @since 2019-07-18.
+ */
+public class Main {
+    public static void main(String[] args) {
+        RateBarrier rateBarrier = new RateBarrier(10, 3);
+
+        final Thread[] threads = new Thread[20];
+        for (int i = 0; i < threads.length; i++) {
+            threads[i] = new Thread(() -> {
+                if (rateBarrier.allow()) {
+                    System.out.println("this is on 3");
+                } else {
+                    System.out.println("this is on 7");
+                }
+            });
+            threads[i].start();
+        }
+
+        for (Thread t : threads) {
+            try {
+                t.join();
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+
+    }
+}
+
+// Output:
+
+/*
+this is on 7
+this is on 7
+this is on 7
+this is on 7
+this is on 3
+this is on 7
+this is on 3
+this is on 7
+this is on 7
+this is on 3
+this is on 7
+this is on 7
+this is on 7
+this is on 7
+this is on 3
+this is on 7
+this is on 3
+this is on 7
+this is on 7
+this is on 3
+*/

src/main/java/me/ehlxr/rate/RateBarrier.java

@@ -0,0 +1,40 @@
+package me.ehlxr.rate;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * 按比例控制流量
+ *
+ * @author lixiangrong
+ * @since 2019-07-19.
+ */
+public class RateBarrier {
+    private AtomicInteger op = new AtomicInteger(0);
+    private List<Integer> source;
+    private int base;
+    private int rate;
+
+    public boolean allow() {
+        return source.get(op.incrementAndGet() % base) < rate;
+    }
+
+    private RateBarrier() {
+    }
+
+    public RateBarrier(int base, int rate) {
+        this.base = base;
+        this.rate = rate;
+
+        source = new ArrayList<>(base);
+        for (int i = 0; i < base; i++) {
+            source.add(i);
+        }
+
+        // 打乱集合顺序
+        Collections.shuffle(source);
+    }
+
+}