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// Copyright 2014 The Bazel Authors. 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
//
// 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 com.google.devtools.build.lib.profiler;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import java.util.List;
/**
* A stat recorder that is able to look at the kind of object added and delegate to the appropriate
* {@link StatRecorder} based on a predicate.
*
* <p> Note that the predicates are evaluated in order and delegated only to the first one. That
* means that the most specific and cheapest predicates should be passed first.
*/
public class PredicateBasedStatRecorder implements StatRecorder {
private final Predicate[] predicates;
private final StatRecorder[] recorders;
public PredicateBasedStatRecorder(List<RecorderAndPredicate> stats) {
predicates = new Predicate[stats.size()];
recorders = new StatRecorder[stats.size()];
for (int i = 0; i < stats.size(); i++) {
RecorderAndPredicate stat = stats.get(i);
predicates[i] = stat.predicate;
recorders[i] = stat.recorder;
}
}
@SuppressWarnings("unchecked")
@Override
public void addStat(int duration, Object obj) {
String description = obj.toString();
for (int i = 0; i < predicates.length; i++) {
if (predicates[i].apply(description)) {
recorders[i].addStat(duration, obj);
return;
}
}
}
@Override
public boolean isEmpty() {
for (StatRecorder recorder : recorders) {
if (!recorder.isEmpty()) {
return false;
}
}
return true;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (StatRecorder recorder : recorders) {
if (recorder.isEmpty()) {
continue;
}
sb.append(recorder);
sb.append("\n");
}
return sb.toString();
}
/**
* A Wrapper of a {@code StatRecorder} and a {@code Predicate}. Objects that matches the predicate
* will be delegated to the StatRecorder.
*/
public static final class RecorderAndPredicate {
private final StatRecorder recorder;
private final Predicate<? super String> predicate;
public RecorderAndPredicate(StatRecorder recorder, Predicate<? super String> predicate) {
this.recorder = recorder;
this.predicate = predicate;
}
}
/** Returns all the delegate stat recorders. */
public ImmutableList<StatRecorder> getRecorders() {
return ImmutableList.<StatRecorder>builder().add(recorders).build();
}
}
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