/*
* Copyright 2012-2017 the original author or authors.
*
* 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 org.springframework.boot.actuate.metrics.buffer;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
/**
* Base class used to manage a map of {@link Buffer} objects.
*
* @param <B> The buffer type
* @author Dave Syer
* @author Phillip Webb
*/
abstract class Buffers<B extends Buffer<?>> {
private final ConcurrentHashMap<String, B> buffers = new ConcurrentHashMap<>();
public void forEach(final Predicate<String> predicate,
final BiConsumer<String, B> consumer) {
this.buffers.forEach(new BiConsumer<String, B>() {
@Override
public void accept(String name, B value) {
if (predicate.test(name)) {
consumer.accept(name, value);
}
}
});
}
public B find(final String name) {
return this.buffers.get(name);
}
public int count() {
return this.buffers.size();
}
protected final void doWith(final String name, final Consumer<B> consumer) {
B buffer = this.buffers.get(name);
if (buffer == null) {
buffer = this.buffers.computeIfAbsent(name, new Function<String, B>() {
@Override
public B apply(String name) {
return createBuffer();
}
});
}
consumer.accept(buffer);
}
protected abstract B createBuffer();
}