content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.activemq.util;
  
  import java.io.File;
  import java.io.FileDescriptor;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.RandomAccessFile;
  import java.nio.channels.FileChannel;
  
  public class RecoverableRandomAccessFile implements java.io.DataOutput, java.io.DataInput, java.io.Closeable {
  
      private static final boolean SKIP_METADATA_UPDATE =
          Boolean.getBoolean("org.apache.activemq.kahaDB.files.skipMetadataUpdate");
  
      RandomAccessFile raf;
      File file;
      String mode;
      final boolean isSkipMetadataUpdate;
  
      public RecoverableRandomAccessFile(File file, String mode, boolean skipMetadataUpdate) throws FileNotFoundException {
          this.file = file;
          this.mode = mode;
          raf = new RandomAccessFile(file, mode);
          isSkipMetadataUpdate = skipMetadataUpdate;
      }
  
      public RecoverableRandomAccessFile(File file, String mode) throws FileNotFoundException {
          this(file, mode, SKIP_METADATA_UPDATE);
      }
  
      public RecoverableRandomAccessFile(String name, String mode) throws FileNotFoundException {
          this(new File(name), mode);
      }
  
      public RandomAccessFile getRaf() throws IOException {
          if (raf == null) {
              raf = new RandomAccessFile(file, mode);
          }
          return raf;
      }
  
      protected void handleException() throws IOException {
          try {
              if (raf != null) {
                  raf.close();
              }
          } catch (Throwable ignore) {
          } finally {
              raf = null;
          }
      }
  
      @Override
      public void close() throws IOException {
          if (raf != null) {
              raf.close();
          }
      }
  
      @Override
      public void readFully(byte[] bytes) throws IOException {
          try {
              getRaf().readFully(bytes);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void readFully(byte[] bytes, int i, int i2) throws IOException {
          try {
              getRaf().readFully(bytes, i, i2);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public int skipBytes(int i) throws IOException {
          try {
              return getRaf().skipBytes(i);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public boolean readBoolean() throws IOException {
          try {
              return getRaf().readBoolean();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public byte readByte() throws IOException {
          try {
              return getRaf().readByte();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public int readUnsignedByte() throws IOException {
          try {
              return getRaf().readUnsignedByte();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public short readShort() throws IOException {
          try {
              return getRaf().readShort();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public int readUnsignedShort() throws IOException {
          try {
              return getRaf().readUnsignedShort();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public char readChar() throws IOException {
          try {
              return getRaf().readChar();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public int readInt() throws IOException {
          try {
              return getRaf().readInt();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public long readLong() throws IOException {
          try {
              return getRaf().readLong();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public float readFloat() throws IOException {
          try {
              return getRaf().readFloat();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public double readDouble() throws IOException {
          try {
              return getRaf().readDouble();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public String readLine() throws IOException {
          try {
              return getRaf().readLine();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public String readUTF() throws IOException {
          try {
              return getRaf().readUTF();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void write(int i) throws IOException {
          try {
              getRaf().write(i);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void write(byte[] bytes) throws IOException {
          try {
              getRaf().write(bytes);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void write(byte[] bytes, int i, int i2) throws IOException {
          try {
              getRaf().write(bytes, i, i2);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeBoolean(boolean b) throws IOException {
          try {
              getRaf().writeBoolean(b);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeByte(int i) throws IOException {
          try {
              getRaf().writeByte(i);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeShort(int i) throws IOException {
          try {
              getRaf().writeShort(i);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeChar(int i) throws IOException {
          try {
              getRaf().writeChar(i);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeInt(int i) throws IOException {
          try {
              getRaf().writeInt(i);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeLong(long l) throws IOException {
          try {
              getRaf().writeLong(l);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeFloat(float v) throws IOException {
          try {
              getRaf().writeFloat(v);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeDouble(double v) throws IOException {
          try {
              getRaf().writeDouble(v);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeBytes(String s) throws IOException {
          try {
              getRaf().writeBytes(s);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeChars(String s) throws IOException {
          try {
              getRaf().writeChars(s);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      @Override
      public void writeUTF(String s) throws IOException {
          try {
              getRaf().writeUTF(s);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
  
      //RAF methods
      public long length() throws IOException {
          try {
              return getRaf().length();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      public void seek(long pos) throws IOException {
          try {
              getRaf().seek(pos);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      public FileDescriptor getFD() throws IOException {
          try {
              return getRaf().getFD();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      public void sync() throws IOException {
          try {
              getRaf().getChannel().force(!isSkipMetadataUpdate);;
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      public FileChannel getChannel() throws IOException {
          try {
              return getRaf().getChannel();
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      public int read(byte[] b, int off, int len) throws IOException {
          try {
              return getRaf().read(b, off, len);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  
      public int read(byte[] b) throws IOException {
          try {
              return getRaf().read(b);
          } catch (IOException ioe) {
              handleException();
              throw ioe;
          }
      }
  }
  