/*
 * 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.camel.component.google.pubsub;

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

import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.layout.PatternLayout;

class OrphanChannelLogAppender extends AbstractAppender {

    private final List<String> messages = Collections.synchronizedList(new ArrayList<>());

    OrphanChannelLogAppender() {
        super("OrphanChannelLogAppender", null, PatternLayout.createDefaultLayout(), false, Property.EMPTY_ARRAY);
        start();
    }

    @Override
    public void append(LogEvent event) {
        messages.add(event.getMessage().getFormattedMessage());
    }

    List<String> getMessages() {
        return Collections.unmodifiableList(messages);
    }

    void reset() {
        messages.clear();
    }
}
