lovelock · February 8, 2021 14:19 · Feb 8, 2021
diff --git a/CompletableFutureTest.java b/CompletableFutureTest.java
@@ -0,0 +1,81 @@
+package fun.happyhacker;
+
+import lombok.Data;
+import org.apache.commons.codec.digest.DigestUtils;
+
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author Frost Wong <frostwong@hotmail.com>
+ * @version 2021/2/8
+ **/
+public class CompletableFutureTest {
+    public static void main(String[] args) throws InterruptedException {
+        CompletableFutureTest completableFutureTest = new CompletableFutureTest();
+        completableFutureTest.compose();
+    }
+
+    private List<Target> compose() throws InterruptedException {
+        List<Long> ids = genIds();
+        Map<Long, String> contentMap = fun1(ids);
+        Map<Long, List<String>> aMap = fun2(ids);
+        Map<Long, String> bMap = hash(contentMap);
+
+        List<Target> list = new ArrayList<>();
+        for (Long id : ids) {
+            Target target = new Target();
+            target.setId(id);
+            target.setContent(contentMap.get(id));
+            target.setList(aMap.get(id));
+            target.setMd5(bMap.get(id));
+        }
+
+        return list;
+    }
+
+    private List<Long> genIds() {
+        return Collections.emptyList();
+    }
+
+    private Map<Long, String> fun1(List<Long> ids) throws InterruptedException {
+        Map<Long, String> result = new HashMap<>();
+        for (Long id : ids) {
+            TimeUnit.MILLISECONDS.sleep(100);
+            result.put(id, id.toString());
+        }
+
+        return result;
+    }
+
+    private Map<Long, List<String>> fun2(List<Long> ids) throws InterruptedException {
+        Map<Long, List<String>> result = new HashMap<>();
+
+        for (Long id : ids) {
+            TimeUnit.MILLISECONDS.sleep(100);
+            result.put(id, List.of(id.toString(), id.toString()));
+        }
+
+        return result;
+    }
+
+    private Map<Long, String> hash(Map<Long, String> map) throws InterruptedException {
+        Map<Long, String> result = new HashMap<>();
+
+        for (Map.Entry<Long, String> entry : map.entrySet()) {
+            TimeUnit.MILLISECONDS.sleep(100);
+            result.put(entry.getKey(), DigestUtils.md5Hex(entry.getValue()));
+        }
+
+        return result;
+    }
+}
+
+
+@Data
+class Target {
+    private Long id;
+    private String content;
+    private String md5;
+    private List<String> list;
+}