Import atomix/{storage,utils}

[controller.git] / third-party / atomix / utils / src / main / java / io / atomix / utils / serializer / KryoIOPool.java

diff --git a/third-party/atomix/utils/src/main/java/io/atomix/utils/serializer/KryoIOPool.java b/third-party/atomix/utils/src/main/java/io/atomix/utils/serializer/KryoIOPool.java
new file mode 100644 (file)
index 0000000..0f40cfc
--- /dev/null
+++ b/third-party/atomix/utils/src/main/java/io/atomix/utils/serializer/KryoIOPool.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2014-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.atomix.utils.serializer;
+
+import java.lang.ref.SoftReference;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.function.Function;
+
+abstract class KryoIOPool<T> {
+
+  private final Queue<SoftReference<T>> queue = new ConcurrentLinkedQueue<>();
+
+  private T borrow(final int bufferSize) {
+    T element;
+    SoftReference<T> reference;
+    while ((reference = queue.poll()) != null) {
+      if ((element = reference.get()) != null) {
+        return element;
+      }
+    }
+    return create(bufferSize);
+  }
+
+  protected abstract T create(final int bufferSize);
+
+  protected abstract boolean recycle(final T element);
+
+  <R> R run(final Function<T, R> function, final int bufferSize) {
+    final T element = borrow(bufferSize);
+    try {
+      return function.apply(element);
+    } finally {
+      if (recycle(element)) {
+        queue.offer(new SoftReference<>(element));
+      }
+    }
+  }
+}