io.mantisrx.server.master.MantisAuditLogWriter Maven / Gradle / Ivy
/*
* Copyright 2019 Netflix, Inc.
*
* 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 io.mantisrx.server.master;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.Observer;
import rx.Subscriber;
import rx.functions.Action0;
import rx.observers.SerializedObserver;
import rx.schedulers.Schedulers;
import rx.subjects.PublishSubject;
public class MantisAuditLogWriter {
private static final Logger logger = LoggerFactory.getLogger(MantisAuditLogWriter.class);
private static MantisAuditLogWriter instance;
private final PublishSubject subject;
private final int backPressureBufferSize = 1000;
private MantisAuditLogWriter(Subscriber subscriber) {
subject = PublishSubject.create();
subject
.onBackpressureBuffer(backPressureBufferSize, new Action0() {
@Override
public void call() {
logger.warn("Exceeded back pressure buffer of " + backPressureBufferSize);
}
})
.observeOn(Schedulers.computation())
.subscribe(subscriber);
}
public static void initialize(Subscriber subscriber) {
instance = new MantisAuditLogWriter(subscriber);
}
public static MantisAuditLogWriter getInstance() {
if (instance == null)
throw new IllegalStateException(MantisAuditLogWriter.class.getName() + " must be initialized before use");
return instance;
}
public Observer getObserver() {
return new SerializedObserver<>(subject);
}
}