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This module provides a Microsoft Application Insights appender implementation for Log4j 1.2 framework
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/*
 * ApplicationInsights-Java
 * Copyright (c) Microsoft Corporation
 * All rights reserved.
 *
 * MIT License
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the ""Software""), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

package com.microsoft.applicationinsights.log4j.v1_2;

import com.microsoft.applicationinsights.internal.common.LogTelemetryClientProxy;
import com.microsoft.applicationinsights.internal.common.TelemetryClientProxy;
import com.microsoft.applicationinsights.internal.logger.InternalLogger;
import com.microsoft.applicationinsights.log4j.v1_2.internal.ApplicationInsightsLogEvent;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

public class ApplicationInsightsAppender extends AppenderSkeleton {

    // region Members

    private boolean isInitialized = false;
    private String instrumentationKey;
    private TelemetryClientProxy telemetryClientProxy;

    // endregion Members

    // region Public methods

    public TelemetryClientProxy getTelemetryClientProxy() {
        return this.telemetryClientProxy;
    }

    /**
     * Sets the instrumentation key.
     * This method is used by Log4j system initializer when reading configuration.
     * @param key The instrumentation key.
     */
    public void setInstrumentationKey(String key) {
        this.instrumentationKey = key;
    }

    /**
     * Subclasses of AppenderSkeleton should implement this
     * method to perform actual logging. See also {@link #doAppend
     * AppenderSkeleton.doAppend} method.
     */
    @Override
    protected void append(LoggingEvent event) {
        if (this.closed || !this.isInitialized) {

            // TODO: trace that closed or not initialized.
            return;
        }

        try {
            ApplicationInsightsLogEvent aiEvent = new ApplicationInsightsLogEvent(event);
            this.telemetryClientProxy.sendEvent(aiEvent);
        } catch (Exception e) {
            // Appender failure must not fail the running application.
            // TODO: Assert.Debug/warning on exception?
        }
    }

    /**
     * Release any allocated resources.
     */
    @Override
    public void close() {
        // No resources to release.
    }

    /**
     * This Appender converts the LoggingEvent it receives into a text string and
     * requires the layout format string to do so.
     */
    @Override
    public boolean requiresLayout() {
        return true;
    }

    /**
     * This method is being called on object initialization.
     */
    @Override
    public void activateOptions() {
        super.activateOptions();

        try {
            this.telemetryClientProxy = new LogTelemetryClientProxy(this.instrumentationKey);
            this.isInitialized = true;
        } catch (Exception e) {
            // Appender failure must not fail the running application.
            this.isInitialized = false;
            InternalLogger.INSTANCE.error("Failed to initialize appender with exception: %s.", e.getMessage());
        }
    }

    // endregion Public methods
}