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diff --git a/java/core/src/main/java/com/google/protobuf/BufferAllocator.java b/java/core/src/main/java/com/google/protobuf/BufferAllocator.java
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+++ b/java/core/src/main/java/com/google/protobuf/BufferAllocator.java
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import java.nio.ByteBuffer;
+
+/**
+ * An object responsible for allocation of buffers. This is an extension point to enable buffer
+ * pooling within an application.
+ */
+@ExperimentalApi
+public abstract class BufferAllocator {
+  private static final BufferAllocator UNPOOLED =
+      new BufferAllocator() {
+        @Override
+        public AllocatedBuffer allocateHeapBuffer(int capacity) {
+          return AllocatedBuffer.wrap(new byte[capacity]);
+        }
+
+        @Override
+        public AllocatedBuffer allocateDirectBuffer(int capacity) {
+          return AllocatedBuffer.wrap(ByteBuffer.allocateDirect(capacity));
+        }
+      };
+
+  /**
+   * Returns an unpooled buffer allocator, which will create a new buffer for each request.
+   */
+  public static BufferAllocator unpooled() {
+    return UNPOOLED;
+  }
+
+  /**
+   * Allocates a buffer with the given capacity that is backed by an array on the heap.
+   */
+  public abstract AllocatedBuffer allocateHeapBuffer(int capacity);
+
+  /**
+   * Allocates a direct (i.e. non-heap) buffer with the given capacity.
+   */
+  public abstract AllocatedBuffer allocateDirectBuffer(int capacity);
+}
+