geode-core/src/main/java/org/apache/geode/internal/cache/persistence/MembershipChangeListener.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.geode.internal.cache.persistence;

import static org.apache.geode.internal.lang.SystemPropertyHelper.PERSISTENT_VIEW_RETRY_TIMEOUT_SECONDS;
import static org.apache.geode.internal.lang.SystemPropertyHelper.getProductIntegerProperty;

import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.Set;
import java.util.function.BooleanSupplier;

import org.apache.geode.CancelCriterion;
import org.apache.geode.distributed.internal.DistributionManager;
import org.apache.geode.distributed.internal.MembershipListener;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;

public class MembershipChangeListener implements MembershipListener, PersistentStateListener {
  private static final int POLL_INTERVAL_MILLIS = 100;

  private final Runnable warning;
  private final BooleanSupplier cancelCondition;
  private final Duration pollDuration;
  private final Duration warningDelay;

  private boolean membershipChanged;
  private boolean warned;

  public MembershipChangeListener(InternalPersistenceAdvisor persistenceAdvisor) {
    warningDelay = warningDelay(persistenceAdvisor);
    cancelCondition = cancelCondition(persistenceAdvisor);
    warning = persistenceAdvisor::logWaitingForMembers;
    pollDuration = pollDuration();
  }

  private Duration warningDelay(InternalPersistenceAdvisor persistenceAdvisor) {
    return Duration.ofSeconds(persistenceAdvisor.getCacheDistributionAdvisor()
        .getDistributionManager().getConfig().getAckWaitThreshold());
  }

  public synchronized void waitForChange() throws InterruptedException {
    Instant now = Instant.now();
    Instant timeoutTime = now.plus(pollDuration);
    Instant warningTime = now.plus(warningDelay);

    while (!membershipChanged && !cancelCondition.getAsBoolean()
        && Instant.now().isBefore(timeoutTime)) {
      warnOnceAfter(warningTime);
      wait(POLL_INTERVAL_MILLIS);
    }
    membershipChanged = false;
  }

  private void warnOnceAfter(Instant warningTime) {
    if (!warned && warningTime.isBefore(Instant.now())) {
      warning.run();
      warned = true;
    }
  }

  private synchronized void afterMembershipChange() {
    membershipChanged = true;
    notifyAll();
  }

  @Override
  public void memberJoined(DistributionManager distributionManager, InternalDistributedMember id) {
    afterMembershipChange();
  }

  @Override
  public void memberDeparted(DistributionManager distributionManager, InternalDistributedMember id,
      boolean crashed) {
    afterMembershipChange();
  }

  @Override
  public void memberSuspect(DistributionManager distributionManager, InternalDistributedMember id,
      InternalDistributedMember whoSuspected, String reason) {}

  @Override
  public void quorumLost(DistributionManager distributionManager,
      Set<InternalDistributedMember> failures, List<InternalDistributedMember> remaining) {}

  @Override
  public void memberOffline(InternalDistributedMember member, PersistentMemberID persistentID) {
    afterMembershipChange();
  }

  @Override
  public void memberOnline(InternalDistributedMember member, PersistentMemberID persistentID) {
    afterMembershipChange();
  }

  @Override
  public void memberRemoved(PersistentMemberID id, boolean revoked) {
    afterMembershipChange();
  }

  private static BooleanSupplier cancelCondition(InternalPersistenceAdvisor persistenceAdvisor) {
    CancelCriterion cancelCriterion =
        persistenceAdvisor.getCacheDistributionAdvisor().getAdvisee().getCancelCriterion();
    return () -> {
      persistenceAdvisor.checkInterruptedByShutdownAll();
      cancelCriterion.checkCancelInProgress(null);
      return persistenceAdvisor.isClosed();
    };
  }

  private static Duration pollDuration() {
    return Duration
        .ofSeconds(getProductIntegerProperty(PERSISTENT_VIEW_RETRY_TIMEOUT_SECONDS).orElse(5));
  }
}