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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.curator.framework.recipes.queue;
import com.google.common.base.Preconditions;
import java.util.concurrent.ThreadFactory;
/**
* Various policies/options for sharding. Usage:
* QueueSharderPolicies.builder().foo().bar().build();
*/
public class QueueSharderPolicies
{
private int newQueueThreshold;
private int thresholdCheckMs;
private int maxQueues;
private ThreadFactory threadFactory;
private static final int DEFAULT_QUEUE_THRESHOLD = 10000;
private static final int DEFAULT_THRESHOLD_CHECK_MS = 30000;
private static final int DEFAULT_MAX_QUEUES = 10;
public static class Builder
{
private QueueSharderPolicies policies = new QueueSharderPolicies();
/**
* Change the queue threshold. This is the number of items that causes
* a new queue to be added. The default is {@link QueueSharderPolicies#DEFAULT_QUEUE_THRESHOLD}
*
* @param newQueueThreshold new value
* @return this
*/
public Builder newQueueThreshold(int newQueueThreshold)
{
Preconditions.checkArgument(newQueueThreshold > 0, "newQueueThreshold must be a positive number");
policies.newQueueThreshold = newQueueThreshold;
return this;
}
/**
* Change the threshold check. This is how often the queue sizes are checked. The default
* is {@link QueueSharderPolicies#DEFAULT_THRESHOLD_CHECK_MS}
*
* @param thresholdCheckMs period in milliseconds
* @return this
*/
public Builder thresholdCheckMs(int thresholdCheckMs)
{
Preconditions.checkArgument(thresholdCheckMs > 0, "thresholdCheckMs must be a positive number");
policies.thresholdCheckMs = thresholdCheckMs;
return this;
}
/**
* Change the maximum number of queues to create. The default value is {@link QueueSharderPolicies#DEFAULT_MAX_QUEUES}
*
* @param maxQueues the new max
* @return this
*/
public Builder maxQueues(int maxQueues)
{
Preconditions.checkArgument(maxQueues > 0, "thresholdCheckMs must be a positive number");
policies.maxQueues = maxQueues;
return this;
}
/**
* Change the thread factory that's used to create the sharder's thread
*
* @param threadFactory new factory
* @return this
*/
public Builder threadFactory(ThreadFactory threadFactory)
{
policies.threadFactory = Preconditions.checkNotNull(threadFactory, "threadFactory cannot be null");
return this;
}
public QueueSharderPolicies build()
{
try
{
return policies;
}
finally
{
policies = new QueueSharderPolicies();
}
}
private Builder()
{
}
}
/**
* Allocate a new builder
*
* @return builder
*/
public static Builder builder()
{
return new Builder();
}
int getNewQueueThreshold()
{
return newQueueThreshold;
}
int getThresholdCheckMs()
{
return thresholdCheckMs;
}
int getMaxQueues()
{
return maxQueues;
}
ThreadFactory getThreadFactory()
{
return threadFactory;
}
private QueueSharderPolicies()
{
this.newQueueThreshold = DEFAULT_QUEUE_THRESHOLD;
this.thresholdCheckMs = DEFAULT_THRESHOLD_CHECK_MS;
this.maxQueues = DEFAULT_MAX_QUEUES;
this.threadFactory = QueueBuilder.defaultThreadFactory;
}
}