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Refactor the context and entry to support asynchronous invocation chain
Signed-off-by: Eric Zhao <[email protected]>
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sentinel-core/src/main/java/com/alibaba/csp/sentinel/AsyncEntry.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * 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; | ||
|
|
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| import com.alibaba.csp.sentinel.context.Context; | ||
| import com.alibaba.csp.sentinel.slotchain.ProcessorSlot; | ||
| import com.alibaba.csp.sentinel.slotchain.ResourceWrapper; | ||
|
|
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| /** | ||
| * The entry for asynchronous resources. | ||
| * | ||
| * @author Eric Zhao | ||
| * @since 0.2.0 | ||
| */ | ||
| public class AsyncEntry extends CtEntry { | ||
|
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| private Context asyncContext; | ||
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| AsyncEntry(ResourceWrapper resourceWrapper, ProcessorSlot<Object> chain, Context context) { | ||
| super(resourceWrapper, chain, context); | ||
| } | ||
|
|
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| /** | ||
| * Remove current entry from local context, but does not exit. | ||
| */ | ||
| void cleanCurrentEntryInLocal() { | ||
| Context originalContext = context; | ||
| if (originalContext != null) { | ||
| Entry curEntry = originalContext.getCurEntry(); | ||
| if (curEntry == this) { | ||
| Entry parent = this.parent; | ||
| originalContext.setCurEntry(parent); | ||
| if (parent != null) { | ||
| ((CtEntry)parent).child = null; | ||
| } | ||
| } else { | ||
| throw new IllegalStateException("Bad async context state"); | ||
| } | ||
| } | ||
| } | ||
|
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| public Context getAsyncContext() { | ||
| return asyncContext; | ||
| } | ||
|
|
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| /** | ||
| * The async context should not be initialized until the node for current resource has been set to current entry. | ||
| */ | ||
| void initAsyncContext() { | ||
| if (asyncContext == null) { | ||
| this.asyncContext = Context.newAsyncContext(context.getEntranceNode(), context.getName()) | ||
| .setOrigin(context.getOrigin()) | ||
| .setCurEntry(this); | ||
| } else { | ||
| throw new IllegalStateException("Duplicate initialize of async context"); | ||
| } | ||
| } | ||
|
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| @Override | ||
| protected void clearEntryContext() { | ||
| super.clearEntryContext(); | ||
| this.asyncContext = null; | ||
| } | ||
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| @Override | ||
| protected Entry trueExit(int count, Object... args) throws ErrorEntryFreeException { | ||
| exitForContext(asyncContext, count, args); | ||
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| return parent; | ||
| } | ||
| } |
103 changes: 103 additions & 0 deletions
103
sentinel-core/src/main/java/com/alibaba/csp/sentinel/CtEntry.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * 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; | ||
|
|
||
| import com.alibaba.csp.sentinel.context.Context; | ||
| import com.alibaba.csp.sentinel.context.ContextUtil; | ||
| import com.alibaba.csp.sentinel.node.Node; | ||
| import com.alibaba.csp.sentinel.slotchain.ProcessorSlot; | ||
| import com.alibaba.csp.sentinel.slotchain.ResourceWrapper; | ||
|
|
||
| /** | ||
| * Linked entry within current context. | ||
| * | ||
| * @author jialiang.linjl | ||
| * @author Eric Zhao | ||
| */ | ||
| class CtEntry extends Entry { | ||
|
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| protected Entry parent = null; | ||
| protected Entry child = null; | ||
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| protected ProcessorSlot<Object> chain; | ||
| protected Context context; | ||
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| CtEntry(ResourceWrapper resourceWrapper, ProcessorSlot<Object> chain, Context context) { | ||
| super(resourceWrapper); | ||
| this.chain = chain; | ||
| this.context = context; | ||
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| setUpEntryFor(context); | ||
| } | ||
|
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| private void setUpEntryFor(Context context) { | ||
| this.parent = context.getCurEntry(); | ||
| if (parent != null) { | ||
| ((CtEntry)parent).child = this; | ||
| } | ||
| context.setCurEntry(this); | ||
| } | ||
|
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| @Override | ||
| public void exit(int count, Object... args) throws ErrorEntryFreeException { | ||
| trueExit(count, args); | ||
| } | ||
|
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| protected void exitForContext(Context context, int count, Object... args) throws ErrorEntryFreeException { | ||
| if (context != null) { | ||
| if (context.getCurEntry() != this) { | ||
| // Clean previous call stack. | ||
| CtEntry e = (CtEntry)context.getCurEntry(); | ||
| while (e != null) { | ||
| e.exit(count, args); | ||
| e = (CtEntry)e.parent; | ||
| } | ||
| throw new ErrorEntryFreeException("The order of entry free is can't be paired with the order of entry"); | ||
| } else { | ||
| if (chain != null) { | ||
| chain.exit(context, resourceWrapper, count, args); | ||
| } | ||
| // Restore the call stack. | ||
| context.setCurEntry(parent); | ||
| if (parent != null) { | ||
| ((CtEntry)parent).child = null; | ||
| } | ||
| if (parent == null) { | ||
| // Auto-created entry indicates immediate exit. | ||
| ContextUtil.exit(); | ||
| } | ||
| // Clean the reference of context in current entry to avoid duplicate exit. | ||
| clearEntryContext(); | ||
| } | ||
| } | ||
| } | ||
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| protected void clearEntryContext() { | ||
| this.context = null; | ||
| } | ||
|
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| @Override | ||
| protected Entry trueExit(int count, Object... args) throws ErrorEntryFreeException { | ||
| exitForContext(context, count, args); | ||
|
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| return parent; | ||
| } | ||
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| @Override | ||
| public Node getLastNode() { | ||
| return parent == null ? null : parent.getCurNode(); | ||
| } | ||
| } |
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