tkalkirill commented on code in PR #4900: URL: https://github.com/apache/ignite-3/pull/4900#discussion_r1884988614
########## modules/core/src/main/java/org/apache/ignite/internal/tostring/IgniteLogThrottle.java: ########## @@ -0,0 +1,532 @@ +/* + * 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.ignite.internal.tostring; + +import static org.apache.ignite.internal.util.ArrayUtils.OBJECT_EMPTY_ARRAY; +import static org.apache.ignite.internal.util.ArrayUtils.nullOrEmpty; + +import java.util.Objects; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentMap; +import java.util.concurrent.TimeUnit; +import org.apache.ignite.internal.lang.IgniteStringFormatter; +import org.apache.ignite.internal.logger.IgniteLogger; +import org.apache.ignite.internal.util.FastTimestamps; +import org.jetbrains.annotations.Nullable; + +/** + * Log throttle. + * + * <p>Errors are logged only if they were not logged for the last {@link #THROTTLE_TIMEOUT_MILLIS} milliseconds. Note that not only error + * messages are checked for duplicates, but also exception classes.</p> + */ +public class IgniteLogThrottle { + /** Throttle timeout in milliseconds (value is 5 min). */ + private static final long THROTTLE_TIMEOUT_MILLIS = TimeUnit.MINUTES.toMillis(5); + + /** Log messages. */ + private static final ConcurrentMap<LogThrottleKey, Long> MESSAGES_MAP = new ConcurrentHashMap<>(128, 0.75f); + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void error(IgniteLogger log, String msg) { + error(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void error(IgniteLogger log, String msg, @Nullable Throwable e) { + error(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String msg, Object... params) { + error(log, msg, (Throwable) null, params); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.ERROR, params); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void error(IgniteLogger log, String throttleKey, String msg) { + error(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + * @param e Error (optional). + */ + public static void error(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + error(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String throttleKey, String msg, Object... params) { + error(log, throttleKey, msg, null, params); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.ERROR, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void warn(IgniteLogger log, String msg) { + warn(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void warn(IgniteLogger log, String msg, @Nullable Throwable e) { + warn(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String msg, Object... params) { + warn(log, msg, (Throwable) null, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.WARN, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void warn(IgniteLogger log, String throttleKey, String msg) { + warn(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + * @param e Error (optional). + */ + public static void warn(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + warn(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String throttleKey, String msg, Object... params) { + warn(log, throttleKey, msg, null, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.WARN, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void info(IgniteLogger log, String msg) { + info(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void info(IgniteLogger log, String msg, @Nullable Throwable e) { + info(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String msg, Object... params) { + info(log, msg, (Throwable) null, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param e Error (optional). + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.INFO, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void info(IgniteLogger log, String throttleKey, String msg) { + info(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param e Error (optional). + * @param msg Message. + */ + public static void info(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + info(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String throttleKey, String msg, Object... params) { + info(log, throttleKey, msg, null, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.INFO, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void debug(IgniteLogger log, String msg) { + debug(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void debug(IgniteLogger log, String msg, @Nullable Throwable e) { + debug(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String msg, Object... params) { + debug(log, msg, (Throwable) null, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param e Error (optional). + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.DEBUG, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg) { + debug(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param e Error (optional). + * @param msg Message. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + debug(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg, Object... params) { + debug(log, throttleKey, msg, null, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.DEBUG, params); + } + + /** Clears cached messages. */ + public static void clean() { Review Comment: There is no longer a method. ########## modules/core/src/main/java/org/apache/ignite/internal/tostring/IgniteLogThrottle.java: ########## @@ -0,0 +1,532 @@ +/* + * 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.ignite.internal.tostring; + +import static org.apache.ignite.internal.util.ArrayUtils.OBJECT_EMPTY_ARRAY; +import static org.apache.ignite.internal.util.ArrayUtils.nullOrEmpty; + +import java.util.Objects; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentMap; +import java.util.concurrent.TimeUnit; +import org.apache.ignite.internal.lang.IgniteStringFormatter; +import org.apache.ignite.internal.logger.IgniteLogger; +import org.apache.ignite.internal.util.FastTimestamps; +import org.jetbrains.annotations.Nullable; + +/** + * Log throttle. + * + * <p>Errors are logged only if they were not logged for the last {@link #THROTTLE_TIMEOUT_MILLIS} milliseconds. Note that not only error + * messages are checked for duplicates, but also exception classes.</p> + */ +public class IgniteLogThrottle { + /** Throttle timeout in milliseconds (value is 5 min). */ + private static final long THROTTLE_TIMEOUT_MILLIS = TimeUnit.MINUTES.toMillis(5); + + /** Log messages. */ + private static final ConcurrentMap<LogThrottleKey, Long> MESSAGES_MAP = new ConcurrentHashMap<>(128, 0.75f); + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void error(IgniteLogger log, String msg) { + error(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void error(IgniteLogger log, String msg, @Nullable Throwable e) { + error(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String msg, Object... params) { + error(log, msg, (Throwable) null, params); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.ERROR, params); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void error(IgniteLogger log, String throttleKey, String msg) { + error(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + * @param e Error (optional). + */ + public static void error(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + error(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String throttleKey, String msg, Object... params) { + error(log, throttleKey, msg, null, params); + } + + /** + * Logs error if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void error(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.ERROR, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void warn(IgniteLogger log, String msg) { + warn(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void warn(IgniteLogger log, String msg, @Nullable Throwable e) { + warn(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String msg, Object... params) { + warn(log, msg, (Throwable) null, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.WARN, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void warn(IgniteLogger log, String throttleKey, String msg) { + warn(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + * @param e Error (optional). + */ + public static void warn(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + warn(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String throttleKey, String msg, Object... params) { + warn(log, throttleKey, msg, null, params); + } + + /** + * Logs warn if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void warn(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.WARN, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void info(IgniteLogger log, String msg) { + info(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void info(IgniteLogger log, String msg, @Nullable Throwable e) { + info(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String msg, Object... params) { + info(log, msg, (Throwable) null, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param e Error (optional). + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.INFO, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void info(IgniteLogger log, String throttleKey, String msg) { + info(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param e Error (optional). + * @param msg Message. + */ + public static void info(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + info(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String throttleKey, String msg, Object... params) { + info(log, throttleKey, msg, null, params); + } + + /** + * Logs info if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void info(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.INFO, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param msg Message. + */ + public static void debug(IgniteLogger log, String msg) { + debug(log, msg, (Throwable) null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param msg Message. + * @param e Error (optional). + */ + public static void debug(IgniteLogger log, String msg, @Nullable Throwable e) { + debug(log, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String msg, Object... params) { + debug(log, msg, (Throwable) null, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param e Error (optional). + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String msg, @Nullable Throwable e, Object... params) { + log(log, e, null, msg, LogLevel.DEBUG, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg) { + debug(log, throttleKey, msg, null, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param e Error (optional). + * @param msg Message. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e) { + debug(log, throttleKey, msg, e, OBJECT_EMPTY_ARRAY); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg, Object... params) { + debug(log, throttleKey, msg, null, params); + } + + /** + * Logs debug if needed. + * + * @param log Logger. + * @param throttleKey Messages with the same key will be throttled. + * @param msg Message pattern. + * @param e Error (optional). + * @param params List of arguments to be substituted in place of formatting anchors. + */ + public static void debug(IgniteLogger log, String throttleKey, String msg, @Nullable Throwable e, Object... params) { + log(log, e, throttleKey, msg, LogLevel.DEBUG, params); + } + + /** Clears cached messages. */ + public static void clean() { Review Comment: Deleted it. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: notifications-unsubscr...@ignite.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
