| /* |
| * 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. |
| */ |
| |
| /* |
| * @author max |
| */ |
| package com.intellij.util.io.storage; |
| |
| import com.intellij.openapi.Disposable; |
| import com.intellij.openapi.Forceable; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.util.io.FileUtilRt; |
| import com.intellij.util.io.PagePool; |
| import com.intellij.util.io.RandomAccessDataFile; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| class DataTable implements Disposable, Forceable { |
| private static final Logger LOG = Logger.getInstance("com.intellij.util.io.storage.DataTable"); |
| |
| private static final int HEADER_SIZE = 32; |
| private static final int DIRTY_MAGIC = 0x12ad34e4; |
| private static final int SAFELY_CLOSED_MAGIC = 0x1f2f3f4f; |
| |
| private final RandomAccessDataFile myFile; |
| private volatile int myWasteSize; |
| |
| private static final int HEADER_MAGIC_OFFSET = 0; |
| private static final int HEADER_WASTE_SIZE_OFFSET = 4; |
| private boolean myIsDirty = false; |
| |
| public DataTable(final File filePath, final PagePool pool) throws IOException { |
| myFile = new RandomAccessDataFile(filePath, pool); |
| if (myFile.length() == 0) { |
| markDirty(); |
| } |
| else { |
| readInHeader(filePath); |
| } |
| } |
| |
| public boolean isCompactNecessary() { |
| return ((double)myWasteSize)/myFile.length() > 0.25 && myWasteSize > 3 * FileUtilRt.MEGABYTE; |
| } |
| |
| private void readInHeader(File filePath) throws IOException { |
| int magic = myFile.getInt(HEADER_MAGIC_OFFSET); |
| if (magic != SAFELY_CLOSED_MAGIC) { |
| myFile.dispose(); |
| throw new IOException("Records table for '" + filePath + "' haven't been closed correctly. Rebuild required."); |
| } |
| myWasteSize = myFile.getInt(HEADER_WASTE_SIZE_OFFSET); |
| } |
| |
| public void readBytes(long address, byte[] bytes) { |
| myFile.get(address, bytes, 0, bytes.length); |
| } |
| |
| public void writeBytes(long address, byte[] bytes) { |
| writeBytes(address, bytes, 0, bytes.length); |
| } |
| |
| public void writeBytes(long address, byte[] bytes, int off, int len) { |
| markDirty(); |
| myFile.put(address, bytes, off, len); |
| } |
| |
| public long allocateSpace(int len) { |
| final long result = Math.max(myFile.length(), HEADER_SIZE); |
| |
| // Fill them in so we won't give out wrong address from allocateSpace() next time if they still not finished writing to allocated page |
| long newLenght = result + len; |
| writeBytes(newLenght - 1, new byte[]{0}); |
| long actualLenght = myFile.length(); |
| if (actualLenght != newLenght) { |
| LOG.error("Failed to resize the storage at: " + myFile.getFile() + ". Required: " + newLenght + ", actual: " + actualLenght); |
| } |
| return result; |
| } |
| |
| public void reclaimSpace(int len) { |
| if (len > 0) { |
| markDirty(); |
| myWasteSize += len; |
| } |
| } |
| |
| @Override |
| public void dispose() { |
| if (!myFile.isDisposed()) { |
| markClean(); |
| myFile.dispose(); |
| } |
| } |
| |
| @Override |
| public void force() { |
| markClean(); |
| myFile.force(); |
| } |
| |
| public boolean flushSome(int maxPages) { |
| myFile.flushSomePages(maxPages); |
| if (!myFile.isDirty()) { |
| force(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean isDirty() { |
| return myIsDirty || myFile.isDirty(); |
| } |
| |
| private void markClean() { |
| if (myIsDirty) { |
| myIsDirty = false; |
| fillInHeader(SAFELY_CLOSED_MAGIC, myWasteSize); |
| } |
| } |
| |
| private void markDirty() { |
| if (!myIsDirty) { |
| myIsDirty = true; |
| fillInHeader(DIRTY_MAGIC, 0); |
| } |
| } |
| |
| private void fillInHeader(int magic, int wasteSize) { |
| myFile.putInt(HEADER_MAGIC_OFFSET, magic); |
| myFile.putInt(HEADER_WASTE_SIZE_OFFSET, wasteSize); |
| } |
| |
| public int getWaste() { |
| return myWasteSize; |
| } |
| |
| public long getFileSize() { |
| return myFile.length(); |
| } |
| } |