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Data processing utilities for ClickHouse
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package com.clickhouse.data;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import com.clickhouse.data.stream.DeferredOutputStream;
import com.clickhouse.data.stream.EmptyOutputStream;
import com.clickhouse.data.stream.WrappedOutputStream;
/**
* Extended output stream for write optimization. It also acts as a factory
* class providing static methods for creating output stream as needed.
*/
public abstract class ClickHouseOutputStream extends OutputStream {
protected static final String ERROR_NULL_BYTES = "Non-null byte array is required";
protected static final String ERROR_REUSE_BUFFER = "Please pass a different byte array instead of the same internal buffer for reading";
protected static final String ERROR_STREAM_CLOSED = "Output stream has been closed";
public static final String TYPE_NAME = "OutputStream";
public static final int DEFAULT_BUFFER_SIZE = 4096;
/**
* Wraps the given output stream.
*
* @param stream pass-thru stream, could be null
* @param output non-null output stream
* @param bufferSize buffer size
* @param compression compression algorithm
* @param compressionLevel compression level
* @param postCloseAction custom action will be performed right after closing
* the wrapped output stream
* @return non-null wrapped output stream
*/
static ClickHouseOutputStream wrap(ClickHousePassThruStream stream, OutputStream output, int bufferSize,
ClickHouseCompression compression, int compressionLevel, Runnable postCloseAction) {
return ClickHouseCompressionAlgorithm.createOutputStream(stream, output, bufferSize, compression,
compressionLevel, postCloseAction);
}
/**
* Gets an empty output stream that consumes nothing and cannot be closed.
*
* @return empty output stream
*/
public static ClickHouseOutputStream empty() {
return EmptyOutputStream.INSTANCE;
}
/**
* Wraps the deferred output stream.
*
* @param deferredOutput non-null deferred output stream
* @param bufferSize buffer size which is always greater than zero(usually
* 4096 or larger)
* @param postCloseAction custom action will be performed right after closing
* the input stream
* @return wrapped output
*/
public static ClickHouseOutputStream of(ClickHouseDeferredValue deferredOutput, int bufferSize,
Runnable postCloseAction) {
return new WrappedOutputStream(null, new DeferredOutputStream(deferredOutput), bufferSize, postCloseAction); // NOSONAR
}
/**
* Wraps the given pass-thru stream as output stream.
*
* @param stream non-null pass-thru stream
* @param postCloseAction custom action will be performed right after closing
* the output stream
* @param bufferSize buffer size which is always greater than zero(usually
* 4096 or larger)
* @return wrapped output
*/
public static ClickHouseOutputStream of(ClickHousePassThruStream stream, int bufferSize, Runnable postCloseAction) {
if (stream == null || !stream.hasOutput()) {
throw new IllegalArgumentException("Non-null pass-thru stream with output is required");
}
return stream.newOutputStream(bufferSize, postCloseAction);
}
/**
* Wraps the given output stream.
*
* @param output output stream
* @return wrapped output, or the same output if it's instance of
* {@link ClickHouseOutputStream}
*/
public static ClickHouseOutputStream of(OutputStream output) {
return of(output, DEFAULT_BUFFER_SIZE, null, -1, null);
}
/**
* Wraps the given output stream.
*
* @param output output stream
* @param bufferSize buffer size which is always greater than zero(usually 4096
* or larger)
* @return wrapped output, or the same output if it's instance of
* {@link ClickHouseOutputStream}
*/
public static ClickHouseOutputStream of(OutputStream output, int bufferSize) {
return of(output, bufferSize, null, -1, null);
}
/**
* Wraps the given output stream.
*
* @param output output stream
* @param bufferSize buffer size which is always greater than zero(usually
* 4096 or larger)
* @param compression compression algorithm, null or
* {@link ClickHouseCompression#NONE} means no
* compression
* @param level compression level
* @param postCloseAction custom action will be performed right after closing
* the output stream
* @return wrapped output, or the same output if it's instance of
* {@link ClickHouseOutputStream}
*/
public static ClickHouseOutputStream of(OutputStream output, int bufferSize, ClickHouseCompression compression,
int level, Runnable postCloseAction) {
final ClickHouseOutputStream chOutput;
if (output == null) {
chOutput = EmptyOutputStream.INSTANCE;
} else if (compression == null || compression == ClickHouseCompression.NONE) {
chOutput = output != EmptyOutputStream.INSTANCE && output instanceof ClickHouseOutputStream
? (ClickHouseOutputStream) output
: new WrappedOutputStream(null, output, bufferSize, postCloseAction);
} else {
chOutput = wrap(null, output, bufferSize, compression, level, postCloseAction);
}
return chOutput;
}
protected final ClickHousePassThruStream stream;
protected final Runnable postCloseAction;
protected volatile boolean closed;
protected ClickHouseOutputStream(ClickHousePassThruStream stream, Runnable postCloseAction) {
this.stream = stream != null ? stream : ClickHousePassThruStream.NULL;
this.postCloseAction = postCloseAction;
this.closed = false;
}
protected void ensureOpen() throws IOException {
if (closed) {
throw new IOException(ERROR_STREAM_CLOSED);
}
}
/**
* Gets underlying file.
*
* @return non-null underlying file
*/
public ClickHouseFile getUnderlyingFile() {
return stream instanceof ClickHouseFile ? ((ClickHouseFile) stream) : ClickHouseFile.NULL;
}
/**
* Gets underlying stream.
*
* @return non-null underlying stream
*/
public ClickHousePassThruStream getUnderlyingStream() {
return stream;
}
/**
* Checks if there's underlying output stream. Same as
* {@code getUnderlyingStream().hasOutput()}.
*
* @return true if there's underlying output stream; false otherwise
*/
public boolean hasUnderlyingStream() {
return stream.hasOutput();
}
/**
* Transfers bytes into output stream without creating a copy.
*
* @param bytes non-null byte array
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
* @deprecated will be dropped in 0.5, please use
* {@link #writeBuffer(ClickHouseByteBuffer)} instead
*/
@Deprecated
public final ClickHouseOutputStream transferBytes(byte[] bytes) throws IOException {
return transferBytes(bytes, 0, bytes.length);
}
/**
* Transfer bytes into output stream without creating a copy.
*
* @param buffer non-null byte buffer
* @param length bytes to write
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
* @deprecated will be dropped in 0.5, please use
* {@link #writeBuffer(ClickHouseByteBuffer)} instead
*/
@Deprecated
public ClickHouseOutputStream transferBytes(ByteBuffer buffer, int length) throws IOException {
if (buffer == null || length < 0) {
throw new IllegalArgumentException("Non-null ByteBuffer and positive length are required");
}
byte[] bytes;
if (buffer.hasArray()) {
bytes = buffer.array();
} else {
bytes = new byte[length];
buffer.get(bytes);
}
return transferBytes(bytes, 0, length);
}
/**
* Transfers the given bytes into output stream, without creating a copy as in
* {@link #writeBytes(byte[], int, int)}.
*
* @param bytes non-null byte array
* @param offset offset of the byte array
* @param length bytes to write
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
* @deprecated will be dropped in 0.5, please use
* {@link #writeBuffer(ClickHouseByteBuffer)} instead
*/
@Deprecated
public abstract ClickHouseOutputStream transferBytes(byte[] bytes, int offset, int length) throws IOException;
@Override
public final void write(int b) throws IOException {
writeByte((byte) (0xFF & b));
}
@Override
public final void write(byte[] b) throws IOException {
writeBytes(b, 0, b.length);
}
@Override
public final void write(byte[] b, int off, int len) throws IOException {
writeBytes(b, off, len);
}
/**
* Checks if the output stream has been closed or not.
*
* @return true if the output stream has been closed; false otherwise
*/
public boolean isClosed() {
return closed;
}
@Override
public void close() throws IOException {
if (closed) {
return;
}
try {
flush();
} finally {
closed = true;
ClickHouseDataStreamFactory.handleCustomAction(postCloseAction);
}
}
/**
* Writes a byte (true=1, false=0) into output stream.
*
* @param b boolean value to write
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeBoolean(boolean b) throws IOException {
return writeByte(b ? (byte) 1 : (byte) 0);
}
/**
* Writes a single byte into output stream.
*
* @param b byte to write
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public abstract ClickHouseOutputStream writeByte(byte b) throws IOException;
/**
* Writes bytes into output stream.
*
* @param buffer non-null byte buffer
* @param length bytes to write
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeBytes(ByteBuffer buffer, int length) throws IOException {
if (buffer == null || length < 0) {
throw new IllegalArgumentException("Non-null ByteBuffer and positive length are required");
}
byte[] bytes;
if (buffer.hasArray()) {
bytes = buffer.array();
} else {
bytes = new byte[length];
buffer.get(bytes);
}
return writeBytes(bytes, 0, length);
}
/**
* Writes bytes into output stream.
*
* @param bytes non-null byte array
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public final ClickHouseOutputStream writeBytes(byte[] bytes) throws IOException {
return writeBytes(bytes, 0, bytes.length);
}
/**
* Writes copy of given bytes into output stream.
*
* @param bytes non-null byte array
* @param offset offset of the byte array
* @param length bytes to write
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public abstract ClickHouseOutputStream writeBytes(byte[] bytes, int offset, int length) throws IOException;
/**
* Writes bytes into output stream. Unlike
* {@link #writeBytes(byte[], int, int)}, which always writes bytes into a
* fixed-size buffer first, this may skip the internal buffer for less memory
* footprint and better performance.
*
* @param buffer wrapped byte array with offset and limit
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeBuffer(ClickHouseByteBuffer buffer) throws IOException {
if (buffer == null || buffer.isEmpty()) {
return this;
}
return writeBytes(buffer.array(), buffer.position(), buffer.length());
}
/**
* Writes bytes using custom writer.
*
* @param writer non-null data writer
* @return current output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public abstract ClickHouseOutputStream writeCustom(ClickHouseDataUpdater writer) throws IOException;
/**
* Writes string into the output stream. Nothing will happen when {@code value}
* is
* null or empty.
*
* @param value string to write
* @param charset charset, null is treated as {@link StandardCharsets#UTF_8}
* @return this output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeString(String value, Charset charset) throws IOException {
if (value == null || value.isEmpty()) {
return writeByte((byte) 0);
} else {
byte[] bytes = value.getBytes(charset != null ? charset : StandardCharsets.UTF_8);
int len = bytes.length;
writeVarInt(len);
return writeBytes(bytes, 0, len);
}
}
/**
* Writes ascii string into output stream. {@link #writeVarInt(int)} will be
* called
* automatically before writing the string.
*
* @param value ascii string to write
* @return this output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeAsciiString(String value) throws IOException {
return writeString(value, StandardCharsets.US_ASCII);
}
/**
* Writes unicode string into output stream. {@link #writeVarInt(int)} will be
* called
* automatically before writing the string.
*
* @param value unicode string to write
* @return this output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeUnicodeString(String value) throws IOException {
return writeString(value, StandardCharsets.UTF_8);
}
/**
* Writes varint into output stream.
*
* @param value varint
* @return this output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeVarInt(int value) throws IOException {
return writeUnsignedVarInt(value);
}
/**
* Writes varint into output stream.
*
* @param value varint
* @return this output stream
* @throws IOException when failed to write value into output stream, not able
* to sent all bytes, or operate on a closed stream
*/
public ClickHouseOutputStream writeUnsignedVarInt(long value) throws IOException {
// https://github.com/ClickHouse/ClickHouse/blob/abe314feecd1647d7c2b952a25da7abf5c19f352/src/IO/VarInt.h#L187
int i = 0;
for (; i < 9; i++) {
byte b = (byte) (value & 0x7F);
if (value > 0x7F) {
b |= 0x80;
}
value >>= 7;
writeByte(b);
if (value == 0) {
break;
}
}
return this;
}
}