/**
* Copyright 2012 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.
*/
package com.netflix.hystrix.strategy.properties;
import com.netflix.hystrix.HystrixCollapser;
import com.netflix.hystrix.HystrixCollapserKey;
import com.netflix.hystrix.HystrixCollapserProperties;
import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixCommandProperties;
import com.netflix.hystrix.HystrixThreadPool;
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.HystrixThreadPoolProperties;
import com.netflix.hystrix.HystrixTimerThreadPoolProperties;
import com.netflix.hystrix.strategy.HystrixPlugins;
/**
* Abstract class with default implementations of factory methods for properties used by various components of Hystrix.
* <p>
* See {@link HystrixPlugins} or the Hystrix GitHub Wiki for information on configuring plugins: <a
* href="https://github.com/Netflix/Hystrix/wiki/Plugins">https://github.com/Netflix/Hystrix/wiki/Plugins</a>.
*/
public abstract class HystrixPropertiesStrategy {
/**
* Construct an implementation of {@link HystrixCommandProperties} for {@link HystrixCommand} instances with {@link HystrixCommandKey}.
* <p>
* <b>Default Implementation</b>
* <p>
* Constructs instance of {@link HystrixPropertiesCommandDefault}.
*
* @param commandKey
* {@link HystrixCommandKey} representing the name or type of {@link HystrixCommand}
* @param builder
* {@link com.netflix.hystrix.HystrixCommandProperties.Setter} with default overrides as injected from the {@link HystrixCommand} implementation.
* <p>
* The builder will return NULL for each value if no override was provided.
* @return Implementation of {@link HystrixCommandProperties}
*/
public HystrixCommandProperties getCommandProperties(HystrixCommandKey commandKey, HystrixCommandProperties.Setter builder) {
return new HystrixPropertiesCommandDefault(commandKey, builder);
}
/**
* Cache key used for caching the retrieval of {@link HystrixCommandProperties} implementations.
* <p>
* Typically this would return <code>HystrixCommandKey.name()</code> but can be done differently if required.
* <p>
* For example, null can be returned which would cause it to not cache and invoke {@link #getCommandProperties} for each {@link HystrixCommand} instantiation (not recommended).
* <p>
* <b>Default Implementation</b>
* <p>
* Returns {@link HystrixCommandKey#name()}
*
* @param commandKey command key used in determining command's cache key
* @param builder builder for {@link HystrixCommandProperties} used in determining command's cache key
* @return String value to be used as the cache key of a {@link HystrixCommandProperties} implementation.
*/
public String getCommandPropertiesCacheKey(HystrixCommandKey commandKey, HystrixCommandProperties.Setter builder) {
return commandKey.name();
}
/**
* Construct an implementation of {@link HystrixThreadPoolProperties} for {@link HystrixThreadPool} instances with {@link HystrixThreadPoolKey}.
* <p>
* <b>Default Implementation</b>
* <p>
* Constructs instance of {@link HystrixPropertiesThreadPoolDefault}.
*
* @param threadPoolKey
* {@link HystrixThreadPoolKey} representing the name or type of {@link HystrixThreadPool}
* @param builder
* {@link com.netflix.hystrix.HystrixThreadPoolProperties.Setter} with default overrides as injected via {@link HystrixCommand} to the {@link HystrixThreadPool} implementation.
* <p>
* The builder will return NULL for each value if no override was provided.
*
* @return Implementation of {@link HystrixThreadPoolProperties}
*/
public HystrixThreadPoolProperties getThreadPoolProperties(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolProperties.Setter builder) {
return new HystrixPropertiesThreadPoolDefault(threadPoolKey, builder);
}
/**
* Cache key used for caching the retrieval of {@link HystrixThreadPoolProperties} implementations.
* <p>
* Typically this would return <code>HystrixThreadPoolKey.name()</code> but can be done differently if required.
* <p>
* For example, null can be returned which would cause it to not cache and invoke {@link #getThreadPoolProperties} for each {@link HystrixThreadPool} instantiation (not recommended).
* <p>
* <b>Default Implementation</b>
* <p>
* Returns {@link HystrixThreadPoolKey#name()}
*
* @param threadPoolKey thread pool key used in determining thread pool's cache key
* @param builder builder for {@link HystrixThreadPoolProperties} used in determining thread pool's cache key
* @return String value to be used as the cache key of a {@link HystrixThreadPoolProperties} implementation.
*/
public String getThreadPoolPropertiesCacheKey(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolProperties.Setter builder) {
return threadPoolKey.name();
}
/**
* Construct an implementation of {@link HystrixCollapserProperties} for {@link HystrixCollapser} instances with {@link HystrixCollapserKey}.
* <p>
* <b>Default Implementation</b>
* <p>
* Constructs instance of {@link HystrixPropertiesCollapserDefault}.
*
* @param collapserKey
* {@link HystrixCollapserKey} representing the name or type of {@link HystrixCollapser}
* @param builder
* {@link com.netflix.hystrix.HystrixCollapserProperties.Setter} with default overrides as injected to the {@link HystrixCollapser} implementation.
* <p>
* The builder will return NULL for each value if no override was provided.
*
* @return Implementation of {@link HystrixCollapserProperties}
*/
public HystrixCollapserProperties getCollapserProperties(HystrixCollapserKey collapserKey, HystrixCollapserProperties.Setter builder) {
return new HystrixPropertiesCollapserDefault(collapserKey, builder);
}
/**
* Cache key used for caching the retrieval of {@link HystrixCollapserProperties} implementations.
* <p>
* Typically this would return <code>HystrixCollapserKey.name()</code> but can be done differently if required.
* <p>
* For example, null can be returned which would cause it to not cache and invoke {@link #getCollapserProperties} for each {@link HystrixCollapser} instantiation (not recommended).
* <p>
* <b>Default Implementation</b>
* <p>
* Returns {@link HystrixCollapserKey#name()}
*
* @param collapserKey collapser key used in determining collapser's cache key
* @param builder builder for {@link HystrixCollapserProperties} used in determining collapser's cache key
* @return String value to be used as the cache key of a {@link HystrixCollapserProperties} implementation.
*/
public String getCollapserPropertiesCacheKey(HystrixCollapserKey collapserKey, HystrixCollapserProperties.Setter builder) {
return collapserKey.name();
}
/**
* Construct an implementation of {@link com.netflix.hystrix.HystrixTimerThreadPoolProperties} for configuration of the timer thread pool
* that handles timeouts and collapser logic.
* <p>
* Constructs instance of {@link HystrixPropertiesTimerThreadPoolDefault}.
*
*
* @return Implementation of {@link com.netflix.hystrix.HystrixTimerThreadPoolProperties}
*/
public HystrixTimerThreadPoolProperties getTimerThreadPoolProperties() {
return new HystrixPropertiesTimerThreadPoolDefault();
}
}