private Header createHeader(
String binlogFile, LogHeader logHeader, String schemaName, String tableName) {
// header会做信息冗余,方便以后做检索或者过滤
Header.Builder headerBuilder = Header.newBuilder();
headerBuilder.setVersion(version);
headerBuilder.setLogfileName(binlogFile);
headerBuilder.setLogfileOffset(logHeader.getLogPos() - logHeader.getEventLen());
headerBuilder.setServerId(logHeader.getServerId());
headerBuilder.setServerenCode(UTF_8); // 经过java输出后所有的编码为unicode
headerBuilder.setExecuteTime(logHeader.getWhen() * 1000L);
headerBuilder.setSourceType(Type.MYSQL);
if (schemaName != null) {
headerBuilder.setSchemaName(StringUtils.lowerCase(schemaName));
}
if (tableName != null) {
headerBuilder.setTableName(StringUtils.lowerCase(tableName));
}
headerBuilder.setEventLength(logHeader.getEventLen());
return headerBuilder.build();
}
/** The time when the query started, in seconds since 1970. */
public final long getWhen() {
return header.getWhen();
}
/**
* The position of the next event in the master binary log, in bytes from the beginning of the
* file. In a binlog that is not a relay log, this is just the position of the next event, in
* bytes from the beginning of the file. In a relay log, this is the position of the next event in
* the master's binlog.
*/
public final long getLogPos() {
return header.getLogPos();
}
/** Server ID of the server that created the event. */
public final long getServerId() {
return header.getServerId();
}
/**
* The total size of this event, in bytes. In other words, this is the sum of the sizes of
* Common-Header, Post-Header, and Body.
*/
public final int getEventLen() {
return header.getEventLen();
}