Remove most of atomix.utils.memory

[controller.git] / third-party / atomix / utils / src / main / java / io / atomix / utils / memory / MappedMemoryAllocator.java

diff --git a/third-party/atomix/utils/src/main/java/io/atomix/utils/memory/MappedMemoryAllocator.java b/third-party/atomix/utils/src/main/java/io/atomix/utils/memory/MappedMemoryAllocator.java
deleted file mode 100644 (file)
index 7a3a270..0000000
--- a/third-party/atomix/utils/src/main/java/io/atomix/utils/memory/MappedMemoryAllocator.java
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * Copyright 2017-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.memory;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.nio.channels.FileChannel;
-import java.util.concurrent.atomic.AtomicInteger;
-
-/**
- * Mapped memory allocator.
- * <p>
- * The mapped memory allocator provides direct memory access to memory mapped from a file on disk. The mapped allocator
- * supports allocating memory in any {@link FileChannel.MapMode}. Once the file is mapped and the
- * memory has been allocated, the mapped allocator provides the memory address of the underlying
- * {@link java.nio.MappedByteBuffer} for access via {@link sun.misc.Unsafe}.
- *
- * @author <a href="http://github.com/kuujo">Jordan Halterman</a>
- */
-public class MappedMemoryAllocator implements MemoryAllocator<MappedMemory> {
-  public static final FileChannel.MapMode DEFAULT_MAP_MODE = FileChannel.MapMode.READ_WRITE;
-
-  private final AtomicInteger referenceCount = new AtomicInteger();
-  private final RandomAccessFile file;
-  private final FileChannel channel;
-  private final FileChannel.MapMode mode;
-  private final long offset;
-
-  public MappedMemoryAllocator(File file) {
-    this(file, DEFAULT_MAP_MODE, 0);
-  }
-
-  public MappedMemoryAllocator(File file, FileChannel.MapMode mode) {
-    this(file, mode, 0);
-  }
-
-  public MappedMemoryAllocator(File file, FileChannel.MapMode mode, long offset) {
-    this(createFile(file, mode), mode, offset);
-  }
-
-  public MappedMemoryAllocator(RandomAccessFile file, FileChannel.MapMode mode, long offset) {
-    if (file == null) {
-      throw new NullPointerException("file cannot be null");
-    }
-    if (mode == null) {
-      throw new NullPointerException("mode cannot be null");
-    }
-    if (offset < 0) {
-      throw new IllegalArgumentException("offset cannot be negative");
-    }
-    this.file = file;
-    this.channel = this.file.getChannel();
-    this.mode = mode;
-    this.offset = offset;
-  }
-
-  private static RandomAccessFile createFile(File file, FileChannel.MapMode mode) {
-    if (file == null) {
-      throw new NullPointerException("file cannot be null");
-    }
-    if (mode == null) {
-      mode = DEFAULT_MAP_MODE;
-    }
-    try {
-      return new RandomAccessFile(file, parseMode(mode));
-    } catch (IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-
-  private static String parseMode(FileChannel.MapMode mode) {
-    if (mode == FileChannel.MapMode.READ_ONLY) {
-      return "r";
-    } else if (mode == FileChannel.MapMode.READ_WRITE) {
-      return "rw";
-    }
-    throw new IllegalArgumentException("unsupported map mode");
-  }
-
-  @Override
-  public MappedMemory allocate(int size) {
-    try {
-      if (file.length() < size) {
-        file.setLength(size);
-      }
-      referenceCount.incrementAndGet();
-      return new MappedMemory(channel.map(mode, offset, size), this);
-    } catch (IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-
-  @Override
-  public MappedMemory reallocate(MappedMemory memory, int size) {
-    MappedMemory newMemory = allocate(size);
-    memory.free();
-    return newMemory;
-  }
-
-  public void close() {
-    try {
-      file.close();
-    } catch (IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-
-  /**
-   * Releases a reference from the allocator.
-   */
-  void release() {
-    if (referenceCount.decrementAndGet() == 0) {
-      close();
-    }
-  }
-
-}