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StandardLogRepository.java
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StandardLogRepository.java
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/*
* 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.nifi.logging.repository;
import org.apache.nifi.logging.ComponentLog;
import org.apache.nifi.logging.LogLevel;
import org.apache.nifi.logging.LogMessage;
import org.apache.nifi.logging.LogObserver;
import org.apache.nifi.logging.LogRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.helpers.MessageFormatter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class StandardLogRepository implements LogRepository {
private final Map<LogLevel, Collection<LogObserver>> observers = new HashMap<>();
private final Map<String, LogObserver> observerLookup = new HashMap<>();
private final ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock();
private final Lock readLock = rwLock.readLock();
private final Lock writeLock = rwLock.writeLock();
private final Logger logger = LoggerFactory.getLogger(StandardLogRepository.class);
private volatile ComponentLog componentLogger;
@Override
public void addLogMessage(final LogLevel level, final String message) {
addLogMessage(level, message, (Throwable) null);
}
@Override
public void addLogMessage(final LogLevel level, final String message, final Throwable t) {
final LogMessage logMessage = new LogMessage(System.currentTimeMillis(), level, message, t);
final Collection<LogObserver> logObservers = observers.get(level);
if (logObservers != null) {
for (LogObserver observer : logObservers) {
try {
observer.onLogMessage(logMessage);
} catch (final Throwable observerThrowable) {
logger.error("Failed to pass log message to Observer {} due to {}", observer, observerThrowable.toString());
}
}
}
}
@Override
public void addLogMessage(final LogLevel level, final String format, final Object[] params) {
replaceThrowablesWithMessage(params);
final String formattedMessage = MessageFormatter.arrayFormat(format, params).getMessage();
addLogMessage(level, formattedMessage);
}
@Override
public void addLogMessage(final LogLevel level, final String format, final Object[] params, final Throwable t) {
replaceThrowablesWithMessage(params);
final String formattedMessage = MessageFormatter.arrayFormat(format, params, t).getMessage();
addLogMessage(level, formattedMessage, t);
}
private void replaceThrowablesWithMessage(final Object[] params) {
for (int i = 0; i < params.length; i++) {
if(params[i] instanceof Throwable) {
params[i] = ((Throwable) params[i]).getLocalizedMessage();
}
}
}
@Override
public void setObservationLevel(String observerIdentifier, LogLevel level) {
writeLock.lock();
try {
final LogObserver observer = removeObserver(observerIdentifier);
if (observer != null) {
addObserver(observerIdentifier, level, observer);
}
} finally {
writeLock.unlock();
}
}
@Override
public LogLevel getObservationLevel(String observerIdentifier) {
readLock.lock();
try {
// ensure observer exists
if (!observerLookup.containsKey(observerIdentifier)) {
throw new IllegalStateException("The specified observer identifier does not exist.");
}
final LogObserver observer = observerLookup.get(observerIdentifier);
for (final LogLevel logLevel : LogLevel.values()) {
final Collection<LogObserver> levelObservers = observers.get(logLevel);
if (levelObservers != null && levelObservers.contains(observer)) {
return logLevel;
}
}
// at this point, the LogLevel must be NONE since we don't register observers for NONE
return LogLevel.NONE;
} finally {
readLock.unlock();
}
}
@Override
public void addObserver(final String observerIdentifier, final LogLevel minimumLevel, final LogObserver observer) {
writeLock.lock();
try {
// ensure observer does not exists
if (observerLookup.containsKey(observerIdentifier)) {
throw new IllegalStateException("The specified observer identifier (" + observerIdentifier + ") already exists.");
}
final LogLevel[] allLevels = LogLevel.values();
for (int i = minimumLevel.ordinal(); i < allLevels.length; i++) {
// no need to register an observer for NONE since that level will never be logged to by a component
if (i != LogLevel.NONE.ordinal()) {
Collection<LogObserver> collection = observers.get(allLevels[i]);
if (collection == null) {
collection = new ArrayList<>();
observers.put(allLevels[i], collection);
}
collection.add(observer);
}
}
observerLookup.put(observerIdentifier, observer);
} finally {
writeLock.unlock();
}
}
@Override
public LogObserver removeObserver(final String observerIdentifier) {
writeLock.lock();
try {
final LogObserver observer = observerLookup.get(observerIdentifier);
for (final Collection<LogObserver> collection : observers.values()) {
collection.remove(observer);
}
return observerLookup.remove(observerIdentifier);
} finally {
writeLock.unlock();
}
}
@Override
public void removeAllObservers() {
writeLock.lock();
try {
observers.clear();
observerLookup.clear();
} finally {
writeLock.unlock();
}
}
@Override
public void setLogger(final ComponentLog componentLogger) {
this.componentLogger = componentLogger;
}
@Override
public ComponentLog getLogger() {
return componentLogger;
}
private boolean hasObserver(final LogLevel logLevel) {
final Collection<LogObserver> logLevelObservers = observers.get(logLevel);
return (logLevelObservers != null && !logLevelObservers.isEmpty());
}
@Override
public boolean isDebugEnabled() {
return hasObserver(LogLevel.DEBUG);
}
@Override
public boolean isInfoEnabled() {
return hasObserver(LogLevel.INFO);
}
@Override
public boolean isWarnEnabled() {
return hasObserver(LogLevel.WARN);
}
@Override
public boolean isErrorEnabled() {
return hasObserver(LogLevel.ERROR);
}
}