org.openprovenance.prov.log.MyAppenderWrapper.ignoreme Maven / Gradle / Ivy

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package org.openprovenance.prov.log;

import org.apache.logging.log4j.Appender;
import org.apache.logging.log4j.AppenderSkeleton;
import org.apache.logging.log4j.spi.AppenderAttachable;
import org.apache.logging.log4j.spi.LoggingEvent;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;

public class MyAppenderWrapper extends AppenderSkeleton implements AppenderAttachable {
    private EventAction action;
    
    public MyAppenderWrapper(EventAction action) {
        this.action=action;
    }
    public MyAppenderWrapper() {
        this.action=null;
    }   
    private final List appenders = new ArrayList();

    public void close() {
        synchronized (appenders) {
            for (Appender appender : appenders) {
                appender.close();
            }
        }
    }

    public boolean requiresLayout() {
        return false;
    }

    public void addAppender(Appender appender) {
        synchronized (appenders) {
            appenders.add(appender);
        }
    }

    public Enumeration getAllAppenders() {
        return Collections.enumeration(appenders);
    }

    public Appender getAppender(String name) {
        synchronized (appenders) {
            for (Appender appender : appenders) {
                if (appender.getName().equals(name)) {
                    return appender;
                }
            }
        }
        return null;
    }

    public boolean isAttached(Appender appender) {
        synchronized (appenders) {
            for (Appender wrapped : appenders) {
                if (wrapped.equals(appender)) {
                    return true;
                }
            }
            return false;
        }
    }

    public void removeAllAppenders() {
        synchronized (appenders) {
            appenders.clear();
        }
    }

    public void removeAppender(Appender appender) {
        synchronized (appenders) {
            for (Iterator i = appenders.iterator(); i.hasNext(); ) {
                if (i.next().equals(appender)) {
                    i.remove();
                }
            }
        }
    }

    public void removeAppender(String name) {
        synchronized (appenders) {
            for (Iterator i = appenders.iterator(); i.hasNext(); ) {
                if (i.next().getName().equals(name)) {
                    i.remove();
                }
            }
        }
    }

    
    protected void append_original(LoggingEvent event) {
        String modifiedMessage = String.format("**** Message modified by MyAppenderWrapper ****\n\n%s\n\n**** Finished modified message ****", event.getMessage());
        LoggingEvent modifiedEvent = new LoggingEvent(event.getFQNOfLoggerClass(), event.getLogger(), event.getTimeStamp(), event.getLevel(), modifiedMessage,
                                                      event.getThreadName(), event.getThrowableInformation(), event.getNDC(), event.getLocationInformation(),
                                                      event.getProperties());

        synchronized (appenders) {
            for (Appender appender : appenders) {
                appender.doAppend(modifiedEvent);
            }
        }
    }
    
    @Override
    protected void append(LoggingEvent event) {
        if (action!=null) action.perform(event);
        synchronized (appenders) {
            for (Appender appender : appenders) {
                appender.doAppend(event);
            }
        }
    }

}