/*
 * 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.logging.log4j.core.appender.db.jdbc;

import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.util.Booleans;

/**
 * This Appender writes logging events to a relational database using standard JDBC mechanisms. It takes a list of
 * {@link ColumnConfig}s with which it determines how to save the event data into the appropriate columns in the table.
 * A {@link ConnectionSource} plugin instance instructs the appender (and {@link JdbcDatabaseManager}) how to connect to
 * the database. This appender can be reconfigured at run time.
 *
 * @see ColumnConfig
 * @see ConnectionSource
 */
@Plugin(name = "JDBC", category = "Core", elementType = Appender.ELEMENT_TYPE, printObject = true)
public final class JdbcAppender extends AbstractDatabaseAppender<JdbcDatabaseManager> {

    private final String description;

    private JdbcAppender(final String name, final Filter filter, final boolean ignoreExceptions,
                         final JdbcDatabaseManager manager) {
        super(name, filter, ignoreExceptions, manager);
        this.description = this.getName() + "{ manager=" + this.getManager() + " }";
    }

    @Override
    public String toString() {
        return this.description;
    }

    /**
     * Factory method for creating a JDBC appender within the plugin manager.
     *
     * @param name The name of the appender.
     * @param ignore If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
     *               they are propagated to the caller.
     * @param filter The filter, if any, to use.
     * @param connectionSource The connections source from which database connections should be retrieved.
     * @param bufferSize If an integer greater than 0, this causes the appender to buffer log events and flush whenever
     *                   the buffer reaches this size.
     * @param tableName The name of the database table to insert log events into.
     * @param columnConfigs Information about the columns that log event data should be inserted into and how to insert
     *                      that data.
     * @return a new JDBC appender.
     */
    @PluginFactory
    public static JdbcAppender createAppender(
            @PluginAttribute("name") final String name,
            @PluginAttribute("ignoreExceptions") final String ignore,
            @PluginElement("Filter") final Filter filter,
            @PluginElement("ConnectionSource") final ConnectionSource connectionSource,
            @PluginAttribute("bufferSize") final String bufferSize,
            @PluginAttribute("tableName") final String tableName,
            @PluginElement("ColumnConfigs") final ColumnConfig[] columnConfigs) {

        final int bufferSizeInt = AbstractAppender.parseInt(bufferSize, 0);
        final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);

        final StringBuilder managerName = new StringBuilder("jdbcManager{ description=").append(name)
                .append(", bufferSize=").append(bufferSizeInt).append(", connectionSource=")
                .append(connectionSource.toString()).append(", tableName=").append(tableName).append(", columns=[ ");

        int i = 0;
        for (final ColumnConfig column : columnConfigs) {
            if (i++ > 0) {
                managerName.append(", ");
            }
            managerName.append(column.toString());
        }

        managerName.append(" ] }");

        final JdbcDatabaseManager manager = JdbcDatabaseManager.getJDBCDatabaseManager(
                managerName.toString(), bufferSizeInt, connectionSource, tableName, columnConfigs
        );
        if (manager == null) {
            return null;
        }

        return new JdbcAppender(name, filter, ignoreExceptions, manager);
    }
}
