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Kieker: Application Performance Monitoring and Dynamic Software Analysis
/***************************************************************************
* Copyright 2022 Kieker Project (http://kieker-monitoring.net)
*
* 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
*
* 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 kieker.monitoring.timer;
import java.util.Date;
import java.util.Locale;
import java.util.concurrent.TimeUnit;
import kieker.common.configuration.Configuration;
/**
* A timer implementation, counting in milliseconds since a specified offset.
*
* @author Jan Waller
*
* @since 1.5
*/
public final class SystemMilliTimer extends AbstractTimeSource {
/** The name of the configuration for the offset. */
public static final String CONFIG_OFFSET = SystemMilliTimer.class.getName() + ".offset";
/** The name of the configuration for the time unit (0 = nanoseconds, 1 = microseconds, 2 = milliseconds, 3 = seconds). */
public static final String CONFIG_UNIT = SystemMilliTimer.class.getName() + ".unit";
private final long offset;
private final TimeUnit timeunit;
/**
* Creates a new instance of this class using the given parameters.
*
* @param configuration
* The configuration for this timer.
*/
public SystemMilliTimer(final Configuration configuration) {
super(configuration);
if (configuration.getStringProperty(CONFIG_OFFSET).length() == 0) {
this.offset = System.currentTimeMillis();
} else {
this.offset = configuration.getLongProperty(CONFIG_OFFSET);
}
this.timeunit = configuration.getEnumProperty(CONFIG_UNIT, TimeUnit.class, TimeUnit.MILLISECONDS);
}
@Override
public long getTime() {
return this.timeunit.convert(System.currentTimeMillis() - this.offset, TimeUnit.MILLISECONDS);
}
@Override
public long getOffset() {
return this.timeunit.convert(this.offset, TimeUnit.MILLISECONDS);
}
@Override
public TimeUnit getTimeUnit() {
return this.timeunit;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(64);
sb.append("Time in ").append(this.timeunit.toString().toLowerCase(Locale.ENGLISH)).append(" (with milliseconds precision) since ")
.append(new Date(this.offset));
return sb.toString();
}
}
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