add module [demo-java-threadSafeCache]

Signed-off-by: ooooo <[email protected]>

Author: ooooo-youwillsee

spring-boot-annotationProcessor/build.gradle renamed to demo-java-annotationProcessor/build.gradle

@@ -5,8 +5,8 @@ dependencyManagement {
 }
 
 dependencies {
-//    annotationProcessor project(":spring-boot-annotationProcessor")
-//    testAnnotationProcessor project(":spring-boot-annotationProcessor")
+//    annotationProcessor project(":demo-java-annotationProcessor")
+//    testAnnotationProcessor project(":demo-java-annotationProcessor")
     implementation(files("${System.properties['java.home']}/../lib/tools.jar"))
 
     testImplementation('com.google.testing.compile:compile-testing:0.19')

spring-boot-annotationProcessor/src/main/java/com/ooooo/annotation/MyGetter.java renamed to demo-java-annotationProcessor/src/main/java/com/ooooo/annotation/MyGetter.java

@@ -0,0 +1,3 @@
+dependencies {
+
+}

spring-boot-annotationProcessor/src/main/java/com/ooooo/annotation/MyGetterAnnotationProcessor.java renamed to demo-java-annotationProcessor/src/main/java/com/ooooo/annotation/MyGetterAnnotationProcessor.java

@@ -0,0 +1,14 @@
+package com.ooooo.cache;
+
+import java.util.function.Supplier;
+
+/**
+ * @author <a href="https://github.com/ooooo-youwillsee">ooooo</a>
+ * @since 1.0.0
+ */
+public interface Cache<T> {
+
+  T get(String key);
+
+  void put(String key, Supplier<T> supplier);
+}

spring-boot-annotationProcessor/src/main/resources/META-INF/services/javax.annotation.processing.Processor renamed to demo-java-annotationProcessor/src/main/resources/META-INF/services/javax.annotation.processing.Processor

@@ -0,0 +1,35 @@
+package com.ooooo.cache.impl;
+
+import com.ooooo.cache.Cache;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+
+/**
+ * @author <a href="https://github.com/ooooo-youwillsee">ooooo</a>
+ * @since 1.0.0
+ */
+public class SafeCacheImpl1<T> implements Cache<T> {
+
+  private final Map<String, T> map = new HashMap<>();
+
+  @Override
+  public synchronized T get(String key) {
+    return map.get(key);
+  }
+
+  /**
+   * 因为使用 synchronized, 导致性能太低了
+   * 比如 A -> AValue, B -> BValue, 这两个操作应该是互不影响的，
+   * 但是现在锁是同一个，所以性能不高
+   *
+   * @param key
+   * @param supplier
+   */
+  @Override
+  public synchronized void put(String key, Supplier<T> supplier) {
+    if (!map.containsKey(key)) {
+      map.put(key, supplier.get());
+    }
+  }
+}

spring-boot-annotationProcessor/src/main/resources/User.java renamed to demo-java-annotationProcessor/src/main/resources/User.java

@@ -0,0 +1,39 @@
+package com.ooooo.cache.impl;
+
+import com.ooooo.cache.Cache;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+
+/**
+ * @author <a href="https://github.com/ooooo-youwillsee">ooooo</a>
+ * @since 1.0.0
+ */
+public class SafeCacheImpl2<T> implements Cache<T> {
+
+  private final Map<String, T> map = new HashMap<>();
+
+  @Override
+  public synchronized T get(String key) {
+    return map.get(key);
+  }
+
+  /**
+   * 因为使用 synchronized, 导致性能太低了
+   * 比如 A -> AValue, B -> BValue, 这两个操作应该是互不影响的，
+   * 但是现在锁是同一个，所以性能不高
+   *
+   * @param key
+   * @param supplier
+   */
+  @Override
+  public void put(String key, Supplier<T> supplier) {
+    if (!map.containsKey(key)) {
+      synchronized (this) {
+        if (!map.containsKey(key)) {
+          map.put(key, supplier.get());
+        }
+      }
+    }
+  }
+}