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LabelContextProvider.java
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LabelContextProvider.java
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/*
* Copyright (c) 2018,2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* 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 org.eclipse.microprofile.context.tck.contexts.label.spi;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.microprofile.context.tck.contexts.label.Label;
import org.eclipse.microprofile.concurrent.spi.ThreadContextController;
import org.eclipse.microprofile.concurrent.spi.ThreadContextProvider;
import org.eclipse.microprofile.concurrent.spi.ThreadContextSnapshot;
/**
* This is a fake all-in-one context provider that is created by the test suite.
* This context type captures/clears/propagates/restores an immutable label (a String) that is associated with a thread.
*/
public class LabelContextProvider implements ThreadContextProvider {
/**
* Cleared context is the empty string.
*/
@Override
public ThreadContextSnapshot clearedContext(Map<String, String> props) {
return snapshot("");
}
/**
* Save the current context.
*/
@Override
public ThreadContextSnapshot currentContext(Map<String, String> props) {
return snapshot(Label.get());
}
@Override
public String getThreadContextType() {
return Label.CONTEXT_NAME;
}
/**
* Construct a snapshot of context for the specified 'label'
*/
private ThreadContextSnapshot snapshot(String label) {
return () -> {
String labelToRestore = Label.get();
AtomicBoolean restored = new AtomicBoolean();
// Construct an instance that restores the previous context that was on the thread
// prior to applying the specified 'label' as the new context.
ThreadContextController contextRestorer = () -> {
if (restored.compareAndSet(false, true)) {
Label.set(labelToRestore);
}
else {
throw new IllegalStateException();
}
};
Label.set(label);
return contextRestorer;
};
}
}