pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/ErrorNotifierImpl.java

/*
 * 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 org.apache.pulsar.functions.worker;

import java.util.concurrent.atomic.AtomicReference;

public class ErrorNotifierImpl implements ErrorNotifier {

    private static final long serialVersionUID = 1L;

    private final AtomicReference<Throwable> error = new AtomicReference<>();

    private volatile boolean isRunning;

    public ErrorNotifierImpl() {
        isRunning = true;
    }

    public synchronized void triggerError(Throwable th) {
        error.set(th);
        this.notify();
    }

    public synchronized void waitForError() throws Exception {
        while (isRunning && error.get() == null) {
            this.wait();
        }

        if (isRunning) {
            throw new Exception(error.get());
        }
    }

    @Override
    public synchronized void close() {
        isRunning = false;
        this.notify();
    }
}