io.fabric8.kubernetes.client.dsl.internal.JobOperationsImpl Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 Red Hat, 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.fabric8.kubernetes.client.dsl.internal;

import com.squareup.okhttp.OkHttpClient;
import io.fabric8.kubernetes.api.model.extensions.DoneableJob;
import io.fabric8.kubernetes.api.model.extensions.Job;
import io.fabric8.kubernetes.api.model.extensions.JobList;
import io.fabric8.kubernetes.client.Config;
import io.fabric8.kubernetes.client.KubernetesClientException;
import io.fabric8.kubernetes.client.dsl.ClientScaleableResource;
import io.fabric8.kubernetes.client.dsl.Reaper;
import io.fabric8.kubernetes.client.dsl.base.HasMetadataOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

public class JobOperationsImpl extends HasMetadataOperation>
  implements ClientScaleableResource {

  static final transient Logger LOG = LoggerFactory.getLogger(JobOperationsImpl.class);

  public JobOperationsImpl(OkHttpClient client, Config config, String namespace) {
    this(client, config, "v1beta1", namespace, null, true, null, null, false, -1, new TreeMap(), new TreeMap(), new TreeMap(), new TreeMap(), new TreeMap());
  }

  public JobOperationsImpl(OkHttpClient client, Config config, String apiVersion, String namespace, String name, Boolean cascading, Job item, String resourceVersion, Boolean reloadingFromServer, long gracePeriodSeconds, Map labels, Map labelsNot, Map labelsIn, Map labelsNotIn, Map fields) {
    super(client, config, "extensions", apiVersion, "jobs", namespace, name, cascading, item, resourceVersion, reloadingFromServer, gracePeriodSeconds, labels, labelsNot, labelsIn, labelsNotIn, fields);
    reaper = new JobReaper(this);
  }

  @Override
  public ClientScaleableResource load(InputStream is) {
    try {
      Job item = unmarshal(is, Job.class);
      return new JobOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), getName(), isCascading(), item, getResourceVersion(), isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields());
    } catch (Throwable t) {
      throw KubernetesClientException.launderThrowable(t);
    }
  }

  @Override
  public ClientScaleableResource fromServer() {
    return new JobOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), getName(), isCascading(), getItem(), getResourceVersion(), true, getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields());
  }

  @Override
  public Job scale(int count) {
    return scale(count, false);
  }

  @Override
  public Job scale(int count, boolean wait) {
    Job res = cascading(false).edit().editSpec().withParallelism(count).endSpec().done();
    if (wait) {
      waitUntilJobIsScaled();
      res = getMandatory();
    }
    return res;
  }

  /**
   * Lets wait until there are enough Ready pods of the given Job
   */
  private void waitUntilJobIsScaled() {
    final CountDownLatch countDownLatch = new CountDownLatch(1);

    final AtomicReference atomicJob = new AtomicReference<>();

    final Runnable jobPoller = new Runnable() {
      public void run() {
        Job job = getMandatory();
        atomicJob.set(job);
        if (Objects.equals(job.getSpec().getParallelism(), job.getStatus().getActive())) {
          countDownLatch.countDown();
        } else {
          LOG.debug("Only {}/{} pods scheduled for Job: {} in namespace: {} seconds so waiting...",
            job.getStatus().getActive(), job.getSpec().getParallelism(), job.getMetadata().getName(), namespace);
        }
      }
    };

    ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
    ScheduledFuture poller = executor.scheduleWithFixedDelay(jobPoller, 0, POLL_INTERVAL_MS, TimeUnit.MILLISECONDS);
    try {
      countDownLatch.await(getConfig().getScaleTimeout(), TimeUnit.MILLISECONDS);
      executor.shutdown();
    } catch (InterruptedException e) {
      poller.cancel(true);
      executor.shutdown();
      LOG.error("Only {}/{} pod(s) ready for Job: {} in namespace: {} - giving up",
        atomicJob.get().getStatus().getActive(), atomicJob.get().getSpec().getParallelism(), atomicJob.get().getMetadata().getName(), namespace);
    }
  }

  private static class JobReaper implements Reaper {
    private JobOperationsImpl oper;

    public JobReaper(JobOperationsImpl oper) {
      this.oper = oper;
    }

    @Override
    public void reap() {
      oper.scale(0, true);
    }
  }
}