org.apache.flume.event.EventHelper Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.flume.event;
import java.io.ByteArrayOutputStream;
import java.util.Arrays;
import org.apache.commons.io.HexDump;
import org.apache.flume.Event;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class EventHelper {
private static final String HEXDUMP_OFFSET = "00000000";
private static final String EOL = System.getProperty("line.separator", "\n");
private static final int DEFAULT_MAX_BYTES = 16;
private static final Logger LOGGER = LoggerFactory
.getLogger(EventHelper.class);
public static String dumpEvent(Event event) {
return dumpEvent(event, DEFAULT_MAX_BYTES);
}
public static String dumpEvent(Event event, int maxBytes) {
StringBuilder buffer = new StringBuilder();
if (event == null || event.getBody() == null) {
buffer.append("null");
} else if (event.getBody().length == 0) {
// do nothing... in this case, HexDump.dump() will throw an exception
} else {
byte[] body = event.getBody();
byte[] data = Arrays.copyOf(body, Math.min(body.length, maxBytes));
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
HexDump.dump(data, 0, out, 0);
String hexDump = new String(out.toByteArray());
// remove offset since it's not relevant for such a small dataset
if (hexDump.startsWith(HEXDUMP_OFFSET)) {
hexDump = hexDump.substring(HEXDUMP_OFFSET.length());
}
buffer.append(hexDump);
} catch (Exception e) {
if (LOGGER.isInfoEnabled()) {
LOGGER.info("Exception while dumping event", e);
}
buffer.append("...Exception while dumping: ").append(e.getMessage());
}
String result = buffer.toString();
if (result.endsWith(EOL) && buffer.length() > EOL.length()) {
buffer.delete(buffer.length() - EOL.length(), buffer.length()).toString();
}
}
return "{ headers:" + event.getHeaders() + " body:" + buffer + " }";
}
}