com.netflix.spinnaker.echo.pipelinetriggers.health.MonitoredPollerHealth.java Source code

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Here is the source code for com.netflix.spinnaker.echo.pipelinetriggers.health.MonitoredPollerHealth.java

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/*
 * Copyright 2015 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 com.netflix.spinnaker.echo.pipelinetriggers.health;

import com.netflix.spinnaker.echo.pipelinetriggers.MonitoredPoller;
import lombok.val;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.health.AbstractHealthIndicator;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.stereotype.Component;

import java.time.Duration;
import java.time.Instant;
import java.time.ZoneId;

import static java.time.Instant.now;
import static java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME;
import static java.time.temporal.ChronoUnit.SECONDS;
import static org.apache.commons.lang3.time.DurationFormatUtils.formatDurationWords;

/**
 * A {@link HealthIndicator} implementation that monitors an instance of {@link MonitoredPoller}.
 * <p>
 * The health status is based on whether the poller is running and how long ago it last polled. If twice the polling
 * interval has passed since the last poll the poller is considered _down_.
 */
@Component
public class MonitoredPollerHealth extends AbstractHealthIndicator {

    private final MonitoredPoller poller;

    @Autowired
    public MonitoredPollerHealth(MonitoredPoller poller) {
        this.poller = poller;
    }

    @Override
    protected void doHealthCheck(Health.Builder builder) {
        if (!poller.isRunning()) {
            builder.outOfService();
        } else {
            polledRecently(builder);
        }
    }

    private void polledRecently(Health.Builder builder) {
        Instant lastPollTimestamp = poller.getLastPollTimestamp();
        if (lastPollTimestamp == null) {
            builder.unknown();
        } else {
            val timeSinceLastPoll = Duration.between(lastPollTimestamp, now());
            builder.withDetail("last.polled",
                    formatDurationWords(timeSinceLastPoll.toMillis(), true, true) + " ago");
            builder.withDetail("last.polled.at",
                    ISO_LOCAL_DATE_TIME.format(lastPollTimestamp.atZone(ZoneId.systemDefault())));
            if (timeSinceLastPoll.compareTo(Duration.of(poller.getPollingIntervalSeconds() * 2, SECONDS)) <= 0) {
                builder.up();
            } else {
                builder.down();
            }
        }
    }
}