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/*
* Copyright (c) 2016-2021 VMware Inc. or its affiliates, All Rights Reserved.
*
* Licensed 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
*
* https://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 reactor.util;
import java.util.function.Supplier;
/**
* Logger interface designed for internal Reactor usage.
*/
public interface Logger {
/**
* A kind of {@link java.util.function.Predicate} and {@link Supplier} mix, provides two
* variants of a message {@link String} depending on the level of detail desired.
*/
@FunctionalInterface
interface ChoiceOfMessageSupplier {
/**
* Provide two possible versions of a message {@link String}, depending on the
* level of detail desired.
*
* @param isVerbose {@code true} for higher level of detail, {@code false} for lower level of detail
* @return the message {@link String} according to the passed level of detail
*/
String get(boolean isVerbose);
}
/**
* Return the name of this Logger instance.
* @return name of this logger instance
*/
String getName();
/**
* Is the logger instance enabled for the TRACE level?
*
* @return True if this Logger is enabled for the TRACE level,
* false otherwise.
*/
boolean isTraceEnabled();
/**
* Log a message at the TRACE level.
*
* @param msg the message string to be logged
*/
void trace(String msg);
/**
* Log a message at the TRACE level according to the specified format
* and arguments.
*
* This form avoids superfluous string concatenation when the logger
* is disabled for the TRACE level. However, this variant incurs the hidden
* (and relatively small) cost of creating an Object[] before invoking the method,
* even if this logger is disabled for TRACE.
*
* @param format the format string
* @param arguments a list of 3 or more arguments
*/
void trace(String format, Object... arguments);
/**
* Log an exception (throwable) at the TRACE level with an
* accompanying message.
*
* @param msg the message accompanying the exception
* @param t the exception (throwable) to log
*/
void trace(String msg, Throwable t);
/**
* Is the logger instance enabled for the DEBUG level?
*
* @return True if this Logger is enabled for the DEBUG level,
* false otherwise.
*/
boolean isDebugEnabled();
/**
* Log a message at the DEBUG level.
*
* @param msg the message string to be logged
*/
void debug(String msg);
/**
* Log a message at the DEBUG level according to the specified format
* and arguments.
*
* This form avoids superfluous string concatenation when the logger
* is disabled for the DEBUG level. However, this variant incurs the hidden
* (and relatively small) cost of creating an Object[] before invoking the method,
* even if this logger is disabled for DEBUG.
*
* @param format the format string
* @param arguments a list of 3 or more arguments
*/
void debug(String format, Object... arguments);
/**
* Log an exception (throwable) at the DEBUG level with an
* accompanying message.
*
* @param msg the message accompanying the exception
* @param t the exception (throwable) to log
*/
void debug(String msg, Throwable t);
/**
* Is the logger instance enabled for the INFO level?
*
* @return True if this Logger is enabled for the INFO level,
* false otherwise.
*/
boolean isInfoEnabled();
/**
* Log a message at the INFO level.
*
* @param msg the message string to be logged
*/
void info(String msg);
/**
* Log a message at the INFO level according to the specified format
* and arguments.
*
* This form avoids superfluous string concatenation when the logger
* is disabled for the INFO level. However, this variant incurs the hidden
* (and relatively small) cost of creating an Object[] before invoking the method,
* even if this logger is disabled for INFO.
*
* @param format the format string
* @param arguments a list of 3 or more arguments
*/
void info(String format, Object... arguments);
/**
* Log an exception (throwable) at the INFO level with an
* accompanying message.
*
* @param msg the message accompanying the exception
* @param t the exception (throwable) to log
*/
void info(String msg, Throwable t);
/**
* Convenience method to log a message that is different according to the log level.
* In priority, DEBUG level is used if {@link #isDebugEnabled()}.
* Otherwise, INFO level is used (unless {@link #isInfoEnabled()} is false).
*
* This can be used to log different level of details according to the active
* log level.
*
* @param messageSupplier the {@link ChoiceOfMessageSupplier} invoked in priority
* with {@code true} for the DEBUG level message, or {@code false} for INFO level
* @see #info(String)
*/
default void infoOrDebug(ChoiceOfMessageSupplier messageSupplier) {
if (isDebugEnabled()) {
debug(messageSupplier.get(true));
}
else if (isInfoEnabled()) {
info(messageSupplier.get(false));
}
}
/**
* Convenience method to log an exception (throwable), with an accompanying
* message that is different according to the log level.
* In priority, DEBUG level is used if {@link #isDebugEnabled()}.
* Otherwise, INFO level is used (unless {@link #isInfoEnabled()} is false).
*
* This can be used to log different level of details according to the active
* log level.
*
* @param messageSupplier the {@link ChoiceOfMessageSupplier} invoked in priority
* with {@code true} for the DEBUG level message, or {@code false} for INFO level
* @param cause the {@link Throwable} the original exception to be logged
* @see #info(String, Throwable)
*/
default void infoOrDebug(ChoiceOfMessageSupplier messageSupplier, Throwable cause) {
if (isDebugEnabled()) {
debug(messageSupplier.get(true), cause);
}
else if (isInfoEnabled()) {
info(messageSupplier.get(false), cause);
}
}
/**
* Is the logger instance enabled for the WARN level?
*
* @return True if this Logger is enabled for the WARN level,
* false otherwise.
*/
boolean isWarnEnabled();
/**
* Log a message at the WARN level.
*
* @param msg the message string to be logged
*/
void warn(String msg);
/**
* Log a message at the WARN level according to the specified format
* and arguments.
*
* This form avoids superfluous string concatenation when the logger
* is disabled for the WARN level. However, this variant incurs the hidden
* (and relatively small) cost of creating an Object[] before invoking the method,
* even if this logger is disabled for WARN.
*
* @param format the format string
* @param arguments a list of 3 or more arguments
*/
void warn(String format, Object... arguments);
/**
* Log an exception (throwable) at the WARN level with an
* accompanying message.
*
* @param msg the message accompanying the exception
* @param t the exception (throwable) to log
*/
void warn(String msg, Throwable t);
/**
* Convenience method to log a message that is different according to the log level.
* In priority, DEBUG level is used if {@link #isDebugEnabled()}.
* Otherwise, WARN level is used (unless {@link #isWarnEnabled()} is false).
*
* This can be used to log different level of details according to the active
* log level.
*
* @param messageSupplier the {@link ChoiceOfMessageSupplier} invoked in priority
* with {@code true} for the DEBUG level message, or {@code false} for WARN level
* @see #warn(String)
*/
default void warnOrDebug(ChoiceOfMessageSupplier messageSupplier) {
if (isDebugEnabled()) {
debug(messageSupplier.get(true));
}
else if (isWarnEnabled()) {
warn(messageSupplier.get(false));
}
}
/**
* Convenience method to log an exception (throwable), with an accompanying
* message that is different according to the log level.
* In priority, DEBUG level is used if {@link #isDebugEnabled()}.
* Otherwise, WARN level is used (unless {@link #isWarnEnabled()} is false).
*
* This can be used to log different level of details according to the active
* log level.
*
* @param messageSupplier the {@link ChoiceOfMessageSupplier} invoked in priority
* with {@code true} for the DEBUG level message, or {@code false} for WARN level
* @param cause the {@link Throwable} the original exception to be logged
* @see #warn(String, Throwable)
*/
default void warnOrDebug(ChoiceOfMessageSupplier messageSupplier, Throwable cause) {
if (isDebugEnabled()) {
debug(messageSupplier.get(true), cause);
}
else if (isWarnEnabled()) {
warn(messageSupplier.get(false), cause);
}
}
/**
* Is the logger instance enabled for the ERROR level?
*
* @return True if this Logger is enabled for the ERROR level,
* false otherwise.
*/
boolean isErrorEnabled();
/**
* Log a message at the ERROR level.
*
* @param msg the message string to be logged
*/
void error(String msg);
/**
* Log a message at the ERROR level according to the specified format
* and arguments.
*
* This form avoids superfluous string concatenation when the logger
* is disabled for the ERROR level. However, this variant incurs the hidden
* (and relatively small) cost of creating an Object[] before invoking the method,
* even if this logger is disabled for ERROR.
*
* @param format the format string
* @param arguments a list of 3 or more arguments
*/
void error(String format, Object... arguments);
/**
* Log an exception (throwable) at the ERROR level with an
* accompanying message.
*
* @param msg the message accompanying the exception
* @param t the exception (throwable) to log
*/
void error(String msg, Throwable t);
/**
* Convenience method to log a message that is different according to the log level.
* In priority, DEBUG level is used if {@link #isDebugEnabled()}.
* Otherwise, ERROR level is used (unless {@link #isErrorEnabled()} is false).
*
* This can be used to log different level of details according to the active
* log level.
*
* @param messageSupplier the {@link ChoiceOfMessageSupplier} invoked in priority
* with {@code true} for the DEBUG level message, or {@code false} for ERROR level
* @see #error(String)
*/
default void errorOrDebug(ChoiceOfMessageSupplier messageSupplier) {
if (isDebugEnabled()) {
debug(messageSupplier.get(true));
}
else if (isErrorEnabled()) {
error(messageSupplier.get(false));
}
}
/**
* Convenience method to log an exception (throwable), with an accompanying
* message that is different according to the log level.
* In priority, DEBUG level is used if {@link #isDebugEnabled()}.
* Otherwise, ERROR level is used (unless {@link #isErrorEnabled()} is false).
*
* This can be used to log different level of details according to the active
* log level.
*
* @param messageSupplier the {@link ChoiceOfMessageSupplier} invoked in priority
* with {@code true} for the DEBUG level message, or {@code false} for ERROR level
* @param cause the {@link Throwable} the original exception to be logged
* @see #error(String, Throwable)
*/
default void errorOrDebug(ChoiceOfMessageSupplier messageSupplier, Throwable cause) {
if (isDebugEnabled()) {
debug(messageSupplier.get(true), cause);
}
else if (isErrorEnabled()) {
error(messageSupplier.get(false), cause);
}
}
}