| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * 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 com.intellij.util.io; |
| |
| import com.intellij.openapi.util.io.FileUtilRt; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| |
| public class ReadWriteDirectBufferWrapper extends DirectBufferWrapper { |
| @NonNls private static final String RW = "rw"; |
| |
| protected ReadWriteDirectBufferWrapper(final File file, final long offset, final long length) { |
| super(file, offset, length); |
| assert length <= Integer.MAX_VALUE : length; |
| } |
| |
| @Override |
| protected ByteBuffer create() throws IOException { |
| final RandomAccessFile file = createFile(); |
| try { |
| final FileChannel channel = file.getChannel(); |
| try { |
| channel.position(myPosition); |
| final ByteBuffer buffer = ByteBuffer.allocateDirect((int)myLength); |
| channel.read(buffer); |
| return buffer; |
| } |
| finally { |
| channel.close(); |
| } |
| } |
| finally { |
| file.close(); |
| } |
| } |
| |
| private RandomAccessFile createFile() throws FileNotFoundException { |
| return FileUtilRt.doIOOperation(new FileUtilRt.RepeatableIOOperation<RandomAccessFile, FileNotFoundException>() { |
| @Nullable |
| @Override |
| public RandomAccessFile execute(boolean finalAttempt) throws FileNotFoundException { |
| try { |
| return new RandomAccessFile(myFile, RW); |
| } catch (FileNotFoundException ex) { |
| if (!finalAttempt) return null; |
| throw ex; |
| } |
| } |
| }); |
| } |
| |
| @Override |
| public void flush() { |
| final ByteBuffer buffer = getCachedBuffer(); |
| if (buffer == null || !isDirty()) return; |
| |
| try { |
| final RandomAccessFile file = createFile(); |
| try { |
| final FileChannel channel = file.getChannel(); |
| try { |
| channel.position(myPosition); |
| buffer.rewind(); |
| channel.write(buffer); |
| myDirty = false; |
| } |
| finally { |
| channel.close(); |
| } |
| } |
| finally { |
| file.close(); |
| } |
| } |
| catch (IOException e) { |
| LOG.error(e); |
| } |
| } |
| } |