Copyright 2016 Netflix, 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.
/**
 * Copyright 2016 Netflix, Inc.
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 com.netflix.hystrix.config;

import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.HystrixThreadPoolProperties;

public class HystrixThreadPoolConfiguration {
    private final HystrixThreadPoolKey threadPoolKey;
    private final int coreSize;
    private final int maximumSize;
    private final int actualMaximumSize;
    private final int maxQueueSize;
    private final int queueRejectionThreshold;
    private final int keepAliveTimeInMinutes;
    private final boolean allowMaximumSizeToDivergeFromCoreSize;
    private final int rollingCounterNumberOfBuckets;
    private final int rollingCounterBucketSizeInMilliseconds;

    private HystrixThreadPoolConfiguration(HystrixThreadPoolKey threadPoolKey, int coreSize, int maximumSize, int actualMaximumSize, int maxQueueSize, int queueRejectionThreshold,
                                           int keepAliveTimeInMinutes, boolean allowMaximumSizeToDivergeFromCoreSize, int rollingCounterNumberOfBuckets,
                                           int rollingCounterBucketSizeInMilliseconds) {
        this.threadPoolKey = threadPoolKey;
        this.allowMaximumSizeToDivergeFromCoreSize = allowMaximumSizeToDivergeFromCoreSize;
        this.coreSize = coreSize;
        this.maximumSize = maximumSize;
        this.actualMaximumSize = actualMaximumSize;
        this.maxQueueSize = maxQueueSize;
        this.queueRejectionThreshold = queueRejectionThreshold;
        this.keepAliveTimeInMinutes = keepAliveTimeInMinutes;
        this.rollingCounterNumberOfBuckets = rollingCounterNumberOfBuckets;
        this.rollingCounterBucketSizeInMilliseconds = rollingCounterBucketSizeInMilliseconds;
    }

    private HystrixThreadPoolConfiguration(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolProperties threadPoolProperties) {
        this(threadPoolKey, threadPoolProperties.coreSize().get(),
                threadPoolProperties.maximumSize().get(), threadPoolProperties.actualMaximumSize(),
                threadPoolProperties.maxQueueSize().get(), threadPoolProperties.queueSizeRejectionThreshold().get(),
                threadPoolProperties.keepAliveTimeMinutes().get(), threadPoolProperties.getAllowMaximumSizeToDivergeFromCoreSize().get(),
                threadPoolProperties.metricsRollingStatisticalWindowBuckets().get(),
                threadPoolProperties.metricsRollingStatisticalWindowInMilliseconds().get());
    }

    public static HystrixThreadPoolConfiguration sample(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolProperties threadPoolProperties) {
        return new HystrixThreadPoolConfiguration(threadPoolKey, threadPoolProperties);
    }

    public HystrixThreadPoolKey getThreadPoolKey() {
        return threadPoolKey;
    }

    public int getCoreSize() {
        return coreSize;
    }

    
Simple getter that returns what the `maximumSize` property is configured as
Returns:
/**
     * Simple getter that returns what the `maximumSize` property is configured as
     * @return
     */
    public int getMaximumSize() {
        return maximumSize;
    }

    
Given all of the thread pool configuration, what is the actual maximumSize applied to the thread pool.
Cases:
1) allowMaximumSizeToDivergeFromCoreSize == false: maximumSize is set to coreSize
2) allowMaximumSizeToDivergeFromCoreSize == true, maximumSize >= coreSize: thread pool has different core/max sizes, so return the configured max
3) allowMaximumSizeToDivergeFromCoreSize == true, maximumSize < coreSize: threadpool incorrectly configured, use coreSize for max size
Returns:
actually configured maximum size of threadpool/**
     * Given all of the thread pool configuration, what is the actual maximumSize applied to the thread pool.
     *
     * Cases:
     * 1) allowMaximumSizeToDivergeFromCoreSize == false: maximumSize is set to coreSize
     * 2) allowMaximumSizeToDivergeFromCoreSize == true, maximumSize >= coreSize: thread pool has different core/max sizes, so return the configured max
     * 3) allowMaximumSizeToDivergeFromCoreSize == true, maximumSize < coreSize: threadpool incorrectly configured, use coreSize for max size
     * @return actually configured maximum size of threadpool
     */
    public int getActualMaximumSize() {
        return this.actualMaximumSize;
    }

    public int getMaxQueueSize() {
        return maxQueueSize;
    }

    public int getQueueRejectionThreshold() {
        return queueRejectionThreshold;
    }

    public int getKeepAliveTimeInMinutes() {
        return keepAliveTimeInMinutes;
    }

    public boolean getAllowMaximumSizeToDivergeFromCoreSize() {
        return allowMaximumSizeToDivergeFromCoreSize;
    }

    public int getRollingCounterNumberOfBuckets() {
        return rollingCounterNumberOfBuckets;
    }

    public int getRollingCounterBucketSizeInMilliseconds() {
        return rollingCounterBucketSizeInMilliseconds;
    }
}