/*
* 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 gobblin.metrics.reporter;
import java.util.Set;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigValueFactory;
import gobblin.metrics.InnerMetricContext;
import gobblin.metrics.MetricContext;
import gobblin.metrics.RootMetricContext;
import gobblin.metrics.context.filter.ContextFilter;
/**
* {@link ContextFilter} that accepts {@link MetricContext} based on whether the name has the correct prefix.
*/
public class PrefixContextFilter implements ContextFilter {
public static final String PREFIX_FILTER = "text.context.filter.prefix.string";
public static Config setPrefixString(Config config, String prefix) {
return config.withValue(PREFIX_FILTER, ConfigValueFactory.fromAnyRef(prefix));
}
private final String prefix;
public PrefixContextFilter(Config config) {
this.prefix = config.getString(PREFIX_FILTER);
}
@Override public Set<MetricContext> getMatchingContexts() {
Set<MetricContext> contexts = Sets.newHashSet();
addContextsRecursively(contexts, RootMetricContext.get());
return ImmutableSet.copyOf(contexts);
}
@Override public boolean matches(MetricContext metricContext) {
return metricContext.getName().startsWith(this.prefix);
}
@Override public boolean shouldReplaceByParent(InnerMetricContext removedMetricContext) {
return false;
}
private void addContextsRecursively(Set<MetricContext> matchingContexts, MetricContext context) {
if(matches(context)) {
matchingContexts.add(context);
}
for(MetricContext context1 : context.getChildContextsAsMap().values()) {
addContextsRecursively(matchingContexts, context1);
}
}
}