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Redis based In-Memory Data Grid for Java
/**
* Copyright (c) 2013-2021 Nikita Koksharov
*
* 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 org.redisson;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.redisson.api.RBinaryStream;
import org.redisson.api.RFuture;
import org.redisson.client.codec.ByteArrayCodec;
import org.redisson.client.codec.LongCodec;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.command.CommandAsyncExecutor;
import org.redisson.misc.CompletableFutureWrapper;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousByteChannel;
import java.nio.channels.CompletionHandler;
import java.nio.channels.SeekableByteChannel;
import java.util.Arrays;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.Future;
/**
*
* @author Nikita Koksharov
*
*/
public class RedissonBinaryStream extends RedissonBucket implements RBinaryStream {
class RedissonOutputStream extends OutputStream {
@Override
public void write(int b) throws IOException {
write(new byte[] {(byte) b});
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
byte[] dest;
if (b.length == len && off == 0) {
dest = b;
} else {
dest = new byte[len];
System.arraycopy(b, off, dest, 0, len);
}
get(commandExecutor.writeAsync(getRawName(), codec, RedisCommands.APPEND, getRawName(), dest));
}
}
class RedissonInputStream extends InputStream {
private long index;
private long mark;
@Override
public long skip(long n) throws IOException {
long k = size() - index;
if (n < k) {
k = n;
if (n < 0) {
k = 0;
}
}
index += k;
return k;
}
@Override
public synchronized void mark(int readlimit) {
mark = index;
}
@Override
public synchronized void reset() throws IOException {
index = mark;
}
@Override
public int available() throws IOException {
return (int) (size() - index);
}
@Override
public boolean markSupported() {
return true;
}
@Override
public int read() throws IOException {
byte[] b = new byte[1];
int len = read(b);
if (len == -1) {
return -1;
}
return b[0] & 0xff;
}
@Override
public int read(byte[] b, int off, final int len) throws IOException {
if (len == 0) {
return 0;
}
if (b == null) {
throw new NullPointerException();
}
if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
}
byte[] data = get(commandExecutor.readAsync(getRawName(), codec, RedisCommands.GETRANGE, getRawName(), index, index+len-1));
if (data.length == 0) {
return -1;
}
index += len;
System.arraycopy(data, 0, b, off, data.length);
return data.length;
}
}
class RedissonByteChannel implements SeekableByteChannel {
int position;
@Override
public int read(ByteBuffer dst) throws IOException {
byte[] data = get(commandExecutor.readAsync(getRawName(), codec, RedisCommands.GETRANGE,
getRawName(), position, position+dst.remaining()-1));
if (data.length == 0) {
return -1;
}
position += data.length;
dst.put(data);
return data.length;
}
@Override
public int write(ByteBuffer src) throws IOException {
ByteBuf b = Unpooled.wrappedBuffer(src);
get(commandExecutor.writeAsync(getRawName(), codec, RedisCommands.SETRANGE, getRawName(), position, b));
position += b.readableBytes();
return b.readableBytes();
}
@Override
public long position() throws IOException {
return position;
}
@Override
public SeekableByteChannel position(long newPosition) throws IOException {
this.position = (int) newPosition;
return this;
}
@Override
public long size() throws IOException {
return RedissonBinaryStream.this.size();
}
@Override
public SeekableByteChannel truncate(long size) throws IOException {
get(commandExecutor.evalWriteAsync(getRawName(), LongCodec.INSTANCE, RedisCommands.EVAL_VOID,
"local len = redis.call('strlen', KEYS[1]); " +
"if tonumber(ARGV[1]) >= len then " +
"return;" +
"end;"
+ "local limitedValue = redis.call('getrange', KEYS[1], 0, tonumber(ARGV[1])-1); "
+ "redis.call('set', KEYS[1], limitedValue); ",
Arrays.asList(getRawName()), size));
return this;
}
@Override
public boolean isOpen() {
return true;
}
@Override
public void close() throws IOException {
}
}
public class RedissonAsynchronousByteChannel implements AsynchronousByteChannel {
volatile int position;
public long position() {
return position;
}
public void position(long newPosition) {
this.position = (int) newPosition;
}
@Override
public void read(ByteBuffer dst, A attachment, CompletionHandler handler) {
RFuture res = (RFuture) read(dst);
res.whenComplete((r, e) -> {
if (e != null) {
handler.failed(e, attachment);
} else {
handler.completed(r, attachment);
}
});
}
@Override
public Future read(ByteBuffer dst) {
RFuture res = commandExecutor.readAsync(getRawName(), codec, RedisCommands.GETRANGE,
getRawName(), position, position + dst.remaining() - 1);
CompletionStage f = res.thenApply(data -> {
if (data.length == 0) {
return -1;
}
position += data.length;
dst.put(data);
return data.length;
});
return new CompletableFutureWrapper<>(f);
}
@Override
public void write(ByteBuffer src, A attachment, CompletionHandler handler) {
RFuture res = (RFuture) write(src);
res.whenComplete((r, e) -> {
if (e != null) {
handler.failed(e, attachment);
} else {
handler.completed(r, attachment);
}
});
}
@Override
public Future write(ByteBuffer src) {
ByteBuf b = Unpooled.wrappedBuffer(src);
RFuture res = commandExecutor.writeAsync(getRawName(), codec, RedisCommands.SETRANGE, getRawName(), position, b);
CompletionStage f = res.thenApply(r -> {
position += b.readableBytes();
return b.readableBytes();
});
return new CompletableFutureWrapper<>(f);
}
@Override
public boolean isOpen() {
return true;
}
@Override
public void close() throws IOException {
}
}
protected RedissonBinaryStream(CommandAsyncExecutor connectionManager, String name) {
super(ByteArrayCodec.INSTANCE, connectionManager, name);
}
@Override
public InputStream getInputStream() {
return new RedissonInputStream();
}
@Override
public OutputStream getOutputStream() {
return new RedissonOutputStream();
}
@Override
public SeekableByteChannel getChannel() {
return new RedissonByteChannel();
}
@Override
public AsynchronousByteChannel getAsynchronousChannel() {
return new RedissonAsynchronousByteChannel();
}
}