com.github.shyiko.mysql.binlog.io.BufferedSocketInputStream Maven / Gradle / Ivy
/*
* Copyright 2022 Ververica Inc.
*
* 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 com.github.shyiko.mysql.binlog.io;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Copied from https://github.com/osheroff/mysql-binlog-connector-java project to fix
* https://github.com/ververica/flink-cdc-connectors/issues/460.
*
* Line 50 and Line 70 ~ 72: Returns -1 means reach the end of InputStream. We should remove this
* class after we bumped a higher mysql-binlog-connector-java version where the
* https://github.com/osheroff/mysql-binlog-connector-java/issues/66 has been fixed.
*/
public class BufferedSocketInputStream extends FilterInputStream {
private byte[] buffer;
private int offset;
private int limit;
public BufferedSocketInputStream(InputStream in) {
this(in, 512 * 1024);
}
public BufferedSocketInputStream(InputStream in, int bufferSize) {
super(in);
this.buffer = new byte[bufferSize];
}
@Override
public int available() throws IOException {
return limit == -1 ? in.available() : limit - offset + in.available();
}
@Override
public int read() throws IOException {
if (offset < limit) {
return buffer[offset++] & 0xff;
}
offset = 0;
limit = in.read(buffer, 0, buffer.length);
return limit != -1 ? buffer[offset++] & 0xff : -1;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (offset >= limit) {
if (len >= buffer.length) {
return in.read(b, off, len);
}
offset = 0;
limit = in.read(buffer, 0, buffer.length);
if (limit == -1) {
return limit;
}
}
int bytesRemainingInBuffer = Math.min(len, limit - offset);
System.arraycopy(buffer, offset, b, off, bytesRemainingInBuffer);
offset += bytesRemainingInBuffer;
return bytesRemainingInBuffer;
}
}