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ThreadLocalRequestContextStorage.java
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ThreadLocalRequestContextStorage.java
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/*
* Copyright 2020 LINE Corporation
*
* LINE Corporation 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:
*
* https://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.linecorp.armeria.common;
import static com.linecorp.armeria.internal.common.RequestContextUtil.newIllegalContextPoppingException;
import static java.util.Objects.requireNonNull;
import com.linecorp.armeria.common.annotation.Nullable;
import io.netty.util.concurrent.FastThreadLocal;
import io.netty.util.internal.InternalThreadLocalMap;
enum ThreadLocalRequestContextStorage implements RequestContextStorage {
INSTANCE;
private static final FastThreadLocal<RequestContext> context = new FastThreadLocal<>();
@Nullable
@Override
@SuppressWarnings("unchecked")
public <T extends RequestContext> T push(RequestContext toPush) {
requireNonNull(toPush, "toPush");
final InternalThreadLocalMap map = InternalThreadLocalMap.get();
final RequestContext oldCtx = context.get(map);
context.set(map, toPush);
return (T) oldCtx;
}
@Override
public void pop(RequestContext current, @Nullable RequestContext toRestore) {
requireNonNull(current, "current");
final InternalThreadLocalMap map = InternalThreadLocalMap.get();
final RequestContext contextInThreadLocal = context.get(map);
if (current != contextInThreadLocal) {
throw newIllegalContextPoppingException(current, contextInThreadLocal);
}
context.set(map, toRestore);
}
@Nullable
@Override
@SuppressWarnings("unchecked")
public <T extends RequestContext> T currentOrNull() {
return (T) context.get();
}
}