net.logstash.logback.composite.LogstashVersionJsonProvider Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of logstash-logback-encoder Show documentation

Logback encoder which will output events as Logstash-compatible JSON

There is a newer version: 8.0

Show newest version

/**
 * 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 net.logstash.logback.composite;

import java.io.IOException;

import net.logstash.logback.fieldnames.LogstashCommonFieldNames;

import com.fasterxml.jackson.core.JsonGenerator;

import ch.qos.logback.access.spi.IAccessEvent;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.spi.DeferredProcessingAware;

/**
 * Writes a numerical version field.
 * This is intended to be the logstash JSON format version.
 * 
 * By default, the version is {@value #DEFAULT_VERSION}.
 *
 * @param  type of event ({@link ILoggingEvent} or {@link IAccessEvent}).
 */
public class LogstashVersionJsonProvider extends AbstractFieldJsonProvider implements FieldNamesAware {
    
    public static final String FIELD_VERSION = "@version";
    
    public static final int DEFAULT_VERSION = 1;
    
    private int version = DEFAULT_VERSION;
    
    public LogstashVersionJsonProvider() {
        setFieldName(FIELD_VERSION);
    }

    @Override
    public void writeTo(JsonGenerator generator, Event event) throws IOException {
        JsonWritingUtils.writeNumberField(generator, getFieldName(), version);
    }
    
    @Override
    public void setFieldNames(LogstashCommonFieldNames fieldNames) {
        setFieldName(fieldNames.getVersion());
    }
    
    public int getVersion() {
        return version;
    }
    
    public void setVersion(int version) {
        this.version = version;
    }

}