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Context.java
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Context.java
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/*
* Copyright 2019, OpenTelemetry Authors
*
* 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 io.opentelemetry.context;
public final class Context {
private final io.grpc.Context ctx;
private Context(io.grpc.Context ctx) {
this.ctx = ctx;
}
public static Context current() {
return new Context(io.grpc.Context.current());
}
public static Scope setCurrent(Context ctx) {
return new ScopeImpl(ctx);
}
public static <T> Context.Key<T> createKey(String name) {
return new Key<T>(io.grpc.Context.<T>key(name));
}
public <T> T getValue(Context.Key<T> key) {
return key.key().get(ctx);
}
public <T> Context setValue(Context.Key<T> key, T value) {
return new Context(ctx.withValue(key.key(), value));
}
public static final class Key<T> {
io.grpc.Context.Key<T> key;
private Key(io.grpc.Context.Key<T> key) {
this.key = key;
}
io.grpc.Context.Key<T> key() {
return key;
}
}
static final class ScopeImpl implements Scope {
private final io.grpc.Context ctx;
private final io.grpc.Context prevCtx;
public ScopeImpl(Context ctx) {
this.ctx = ctx.ctx;
this.prevCtx = ctx.ctx.attach();
}
@Override
public void close() {
ctx.detach(prevCtx);
}
}
}