| /** |
| * 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.common.policies.impl; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import com.google.common.base.Objects; |
| import java.util.SortedSet; |
| import org.apache.pulsar.common.policies.AutoFailoverPolicy; |
| import org.apache.pulsar.common.policies.data.AutoFailoverPolicyData; |
| import org.apache.pulsar.common.policies.data.AutoFailoverPolicyType; |
| import org.apache.pulsar.common.policies.data.BrokerStatus; |
| |
| /** |
| * Implementation of min available policy. |
| */ |
| public class MinAvailablePolicy extends AutoFailoverPolicy { |
| private static final String MIN_LIMIT_KEY = "min_limit"; |
| private static final String USAGE_THRESHOLD_KEY = "usage_threshold"; |
| private static final int MAX_USAGE_THRESHOLD = 100; |
| |
| @SuppressWarnings("checkstyle:MemberName") |
| public int min_limit; |
| @SuppressWarnings("checkstyle:MemberName") |
| public int usage_threshold; |
| |
| MinAvailablePolicy(int minLimit, int usageThreshold) { |
| this.min_limit = minLimit; |
| this.usage_threshold = usageThreshold; |
| } |
| |
| public MinAvailablePolicy(AutoFailoverPolicyData policyData) { |
| checkArgument(policyData.policy_type.equals(AutoFailoverPolicyType.min_available)); |
| checkArgument(policyData.parameters.containsKey(MIN_LIMIT_KEY)); |
| checkArgument(policyData.parameters.containsKey(USAGE_THRESHOLD_KEY)); |
| this.min_limit = Integer.parseInt(policyData.parameters.get(MIN_LIMIT_KEY)); |
| this.usage_threshold = Integer.parseInt(policyData.parameters.get(USAGE_THRESHOLD_KEY)); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(min_limit, usage_threshold); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof MinAvailablePolicy) { |
| MinAvailablePolicy other = (MinAvailablePolicy) obj; |
| return Objects.equal(min_limit, other.min_limit) && Objects.equal(usage_threshold, other.usage_threshold); |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean isBrokerAvailable(BrokerStatus brokerStatus) { |
| return brokerStatus.isActive() |
| && (usage_threshold == MAX_USAGE_THRESHOLD || brokerStatus.getLoadFactor() < usage_threshold); |
| } |
| |
| @Override |
| public boolean shouldFailoverToSecondary(SortedSet<BrokerStatus> primaryCandidates) { |
| int numAvailablePrimaryBrokers = 0; |
| for (BrokerStatus brkStatus : primaryCandidates) { |
| if (isBrokerAvailable(brkStatus)) { |
| numAvailablePrimaryBrokers++; |
| } |
| } |
| |
| return numAvailablePrimaryBrokers < this.min_limit; |
| } |
| |
| @Override |
| public boolean shouldFailoverToSecondary(int totalPrimaryCandidates) { |
| return totalPrimaryCandidates < this.min_limit; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("[policy_type=min_available min_limit=%s usage_threshold=%s]", min_limit, usage_threshold); |
| } |
| } |