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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.utils;
import java.io.PrintStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public interface OutputHandler
{
// called when an important info need to be displayed
void output(String msg);
default void output(String msg, Object ... args)
{
output(String.format(msg, args));
}
// called when a less important info need to be displayed
void debug(String msg);
default void debug(String msg, Object ... args)
{
debug(String.format(msg, args));
}
// called when the user needs to be warn
void warn(String msg);
void warn(Throwable th, String msg);
default void warn(Throwable th)
{
warn(th, th.getMessage());
}
default void warn(Throwable th, String msg, Object... args)
{
warn(th, String.format(msg, args));
}
default void warn(String msg, Object ... args)
{
warn(String.format(msg, args));
}
class LogOutput implements OutputHandler
{
private static Logger logger = LoggerFactory.getLogger(LogOutput.class);
public void output(String msg)
{
logger.info(msg);
}
public void debug(String msg)
{
logger.trace(msg);
}
public void warn(String msg)
{
logger.warn(msg);
}
public void warn(Throwable th, String msg)
{
logger.warn(msg, th);
}
}
class SystemOutput implements OutputHandler
{
public final boolean debug;
public final boolean printStack;
public final PrintStream warnOut;
public SystemOutput(boolean debug, boolean printStack)
{
this(debug, printStack, false);
}
public SystemOutput(boolean debug, boolean printStack, boolean logWarnToStdErr)
{
this.debug = debug;
this.printStack = printStack;
this.warnOut = logWarnToStdErr ? System.err : System.out;
}
public void output(String msg)
{
System.out.println(msg);
}
public void debug(String msg)
{
if (debug)
System.out.println(msg);
}
public void warn(String msg)
{
warn((Throwable) null, msg);
}
public void warn(Throwable th, String msg)
{
warnOut.println("WARNING: " + msg);
if (printStack && th != null)
th.printStackTrace(warnOut);
}
}
}