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/**
* 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.client.api;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.pulsar.common.classification.InterfaceAudience;
import org.apache.pulsar.common.classification.InterfaceStability;
/**
* KeyShared policy for KeyShared subscription.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class KeySharedPolicy {
protected KeySharedMode keySharedMode;
protected boolean allowOutOfOrderDelivery = false;
public static final int DEFAULT_HASH_RANGE_SIZE = 2 << 15;
public static KeySharedPolicyAutoSplit autoSplitHashRange() {
return new KeySharedPolicyAutoSplit();
}
public static KeySharedPolicySticky stickyHashRange() {
return new KeySharedPolicySticky();
}
public abstract void validate();
/**
* If enabled, it will relax the ordering requirement, allowing the broker to send out-of-order messages in case of
* failures. This will make it faster for new consumers to join without being stalled by an existing slow consumer.
*
* <p>In this case, a single consumer will still receive all the keys, but they may be coming in different orders.
*
* @param allowOutOfOrderDelivery
* whether to allow for out of order delivery
* @return KeySharedPolicy instance
*/
public KeySharedPolicy setAllowOutOfOrderDelivery(boolean allowOutOfOrderDelivery) {
this.allowOutOfOrderDelivery = allowOutOfOrderDelivery;
return this;
}
public boolean isAllowOutOfOrderDelivery() {
return allowOutOfOrderDelivery;
}
public KeySharedMode getKeySharedMode() {
return this.keySharedMode;
}
public int getHashRangeTotal() {
return DEFAULT_HASH_RANGE_SIZE;
}
/**
* Sticky attach topic with fixed hash range.
*
* <p>Total hash range size is 65536, using the sticky hash range policy should ensure that the provided ranges by
* all consumers can cover the total hash range [0, 65535]. If not, while broker dispatcher can't find the consumer
* for message, the cursor will rewind.
*/
public static class KeySharedPolicySticky extends KeySharedPolicy {
protected final List<Range> ranges;
KeySharedPolicySticky() {
this.keySharedMode = KeySharedMode.STICKY;
this.ranges = new ArrayList<>();
}
public KeySharedPolicySticky ranges(List<Range> ranges) {
this.ranges.addAll(ranges);
return this;
}
public KeySharedPolicySticky ranges(Range... ranges) {
this.ranges.addAll(Arrays.asList(ranges));
return this;
}
@Override
public void validate() {
if (ranges.isEmpty()) {
throw new IllegalArgumentException("Ranges for KeyShared policy must not be empty.");
}
for (int i = 0; i < ranges.size(); i++) {
Range range1 = ranges.get(i);
if (range1.getStart() < 0 || range1.getEnd() >= DEFAULT_HASH_RANGE_SIZE) {
throw new IllegalArgumentException("Ranges must be [0, 65535] but provided range is " + range1);
}
for (int j = 0; j < ranges.size(); j++) {
Range range2 = ranges.get(j);
if (i != j && range1.intersect(range2) != null) {
throw new IllegalArgumentException("Ranges for KeyShared policy with overlap between " + range1
+ " and " + range2);
}
}
}
}
public List<Range> getRanges() {
return ranges;
}
}
/**
* Auto split hash range key shared policy.
*/
public static class KeySharedPolicyAutoSplit extends KeySharedPolicy {
KeySharedPolicyAutoSplit() {
this.keySharedMode = KeySharedMode.AUTO_SPLIT;
}
@Override
public void validate() {
// do nothing here
}
}
}