126 lines
2.4 KiB
Java
126 lines
2.4 KiB
Java
package it.cavallium.dbengine.lucene.directory;
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import org.apache.lucene.store.BufferedChecksum;
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import org.apache.lucene.store.IndexOutput;
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import org.apache.lucene.util.Accountable;
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import java.io.IOException;
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import java.util.Collection;
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import java.util.zip.CRC32;
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import java.util.zip.Checksum;
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/**
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* Created by wens on 16-3-10.
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*/
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public class RocksdbOutputStream extends IndexOutput implements Accountable {
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private final int bufferSize;
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private long position;
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private final byte[] currentBuffer;
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private int currentBufferIndex;
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private boolean dirty;
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private final Checksum crc;
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private final RocksdbFileStore store;
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private final String name;
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public RocksdbOutputStream(String name, RocksdbFileStore store, int bufferSize, boolean checksum) {
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super("RocksdbOutputStream(name=" + name + ")", name);
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this.name = name;
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this.store = store;
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this.bufferSize = bufferSize;
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this.currentBuffer = new byte[this.bufferSize];
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this.position = 0;
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this.dirty = false;
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if (checksum) {
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crc = new BufferedChecksum(new CRC32());
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} else {
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crc = null;
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}
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}
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@Override
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public void close() throws IOException {
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if (dirty) {
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flush();
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}
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//store.close();
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}
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private void flush() throws IOException {
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store.append(name, currentBuffer, 0, currentBufferIndex);
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currentBufferIndex = 0;
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dirty = false;
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}
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@Override
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public long getFilePointer() {
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return position;
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}
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@Override
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public long getChecksum() {
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if (crc != null) {
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return crc.getValue();
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} else {
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throw new IllegalStateException("crc is null");
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}
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}
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@Override
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public void writeByte(byte b) throws IOException {
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if (crc != null) {
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crc.update(b);
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}
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if (currentBufferIndex == bufferSize) {
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flush();
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}
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currentBuffer[currentBufferIndex++] = b;
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position++;
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dirty = true;
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}
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@Override
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public void writeBytes(byte[] b, int offset, int length) throws IOException {
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if (crc != null) {
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crc.update(b, offset, length);
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}
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int f = offset;
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int n = length;
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do {
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if (currentBufferIndex == bufferSize) {
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flush();
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}
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int r = Math.min(bufferSize - currentBufferIndex, n);
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System.arraycopy(b, f, currentBuffer, currentBufferIndex, r);
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f += r;
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currentBufferIndex += r;
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position += r;
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n -= r;
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dirty = true;
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} while (n != 0);
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}
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@Override
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public long ramBytesUsed() {
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return position;
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}
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@Override
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public Collection<Accountable> getChildResources() {
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return null;
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}
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} |