package com.codahale.metrics.logback;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.Appender;
import ch.qos.logback.core.UnsynchronizedAppenderBase;
import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.SharedMetricRegistries;

import static com.codahale.metrics.MetricRegistry.name;

A Logback Appender which has six meters, one for each logging level and one for the total number of statements being logged. The meter names are the logging level names appended to the name of the appender. /**
 * A Logback {@link Appender} which has six meters, one for each logging level and one for the total
 * number of statements being logged. The meter names are the logging level names appended to the
 * name of the appender.
 */
public class InstrumentedAppender extends UnsynchronizedAppenderBase<ILoggingEvent> {
    private final MetricRegistry registry;
    public static final String DEFAULT_REGISTRY = "logback-metrics";
    public static final String REGISTRY_PROPERTY_NAME = "metrics.logback.registry";

    private Meter all;
    private Meter trace;
    private Meter debug;
    private Meter info;
    private Meter warn;
    private Meter error;


    
Create a new instrumented appender using the given registry name.
/**
     * Create a new instrumented appender using the given registry name.
     */
    public InstrumentedAppender() {
        this(System.getProperty(REGISTRY_PROPERTY_NAME, DEFAULT_REGISTRY));
    }

    
Create a new instrumented appender using the given registry name.
Params:
registryName – the name of the registry in SharedMetricRegistries/**
     * Create a new instrumented appender using the given registry name.
     *
     * @param registryName the name of the registry in {@link SharedMetricRegistries}
     */
    public InstrumentedAppender(String registryName) {
        this(SharedMetricRegistries.getOrCreate(registryName));
    }

    
Create a new instrumented appender using the given registry.
Params:
registry – the metric registry/**
     * Create a new instrumented appender using the given registry.
     *
     * @param registry the metric registry
     */
    public InstrumentedAppender(MetricRegistry registry) {
        this.registry = registry;
        setName(Appender.class.getName());
    }

    @Override
    public void start() {
        this.all = registry.meter(name(getName(), "all"));
        this.trace = registry.meter(name(getName(), "trace"));
        this.debug = registry.meter(name(getName(), "debug"));
        this.info = registry.meter(name(getName(), "info"));
        this.warn = registry.meter(name(getName(), "warn"));
        this.error = registry.meter(name(getName(), "error"));
        super.start();
    }

    @Override
    protected void append(ILoggingEvent event) {
        all.mark();
        switch (event.getLevel().toInt()) {
            case Level.TRACE_INT:
                trace.mark();
                break;
            case Level.DEBUG_INT:
                debug.mark();
                break;
            case Level.INFO_INT:
                info.mark();
                break;
            case Level.WARN_INT:
                warn.mark();
                break;
            case Level.ERROR_INT:
                error.mark();
                break;
            default:
                break;
        }
    }
}