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Support extensible slot chain builder using SPI mechanism (alibaba#145)
- Support extensible `SlotChainBuilder` using SPI mechanism - Add a `SlotChainProvider` to load slot chain builder and create new slot chains Signed-off-by: Eric Zhao <sczyh16@gmail.com>
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sentinel-core/src/main/java/com/alibaba/csp/sentinel/slotchain/SlotChainProvider.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Copyright 1999-2018 Alibaba Group Holding Ltd. | ||
| * | ||
| * 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.alibaba.csp.sentinel.slotchain; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.ServiceLoader; | ||
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| import com.alibaba.csp.sentinel.log.RecordLog; | ||
| import com.alibaba.csp.sentinel.slots.DefaultSlotChainBuilder; | ||
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| /** | ||
| * A provider for creating slot chains via resolved slot chain builder SPI. | ||
| * | ||
| * @author Eric Zhao | ||
| * @since 0.2.0 | ||
| */ | ||
| public final class SlotChainProvider { | ||
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| private static volatile SlotChainBuilder builder = null; | ||
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| private static final ServiceLoader<SlotChainBuilder> LOADER = ServiceLoader.load(SlotChainBuilder.class); | ||
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| /** | ||
| * The load and pick process is not thread-safe, but it's okay since the method should be only invoked | ||
| * via {@code lookProcessChain} in {@link com.alibaba.csp.sentinel.CtSph} under lock. | ||
| * | ||
| * @return new created slot chain | ||
| */ | ||
| public static ProcessorSlotChain newSlotChain() { | ||
| if (builder != null) { | ||
| return builder.build(); | ||
| } | ||
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| resolveSlotChainBuilder(); | ||
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| if (builder == null) { | ||
| RecordLog.warn("[SlotChainProvider] Wrong state when resolving slot chain builder, using default"); | ||
| builder = new DefaultSlotChainBuilder(); | ||
| } | ||
| return builder.build(); | ||
| } | ||
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| private static void resolveSlotChainBuilder() { | ||
| List<SlotChainBuilder> list = new ArrayList<SlotChainBuilder>(); | ||
| boolean hasOther = false; | ||
| for (SlotChainBuilder builder : LOADER) { | ||
| if (builder.getClass() != DefaultSlotChainBuilder.class) { | ||
| hasOther = true; | ||
| list.add(builder); | ||
| } | ||
| } | ||
| if (hasOther) { | ||
| builder = list.get(0); | ||
| } else { | ||
| // No custom builder, using default. | ||
| builder = new DefaultSlotChainBuilder(); | ||
| } | ||
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| RecordLog.info("[SlotChainProvider] Global slot chain builder resolved: " | ||
| + builder.getClass().getCanonicalName()); | ||
| } | ||
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| private SlotChainProvider() {} | ||
| } |
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.../src/main/resources/META-INF/services/com.alibaba.csp.sentinel.slotchain.SlotChainBuilder
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| Original file line number | Diff line number | Diff line change |
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| # Default slot chain builder | ||
| com.alibaba.csp.sentinel.slots.DefaultSlotChainBuilder |