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BufferContextRestorer.java
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BufferContextRestorer.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.buffer.spi;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.microprofile.context.tck.contexts.buffer.Buffer;
import org.eclipse.microprofile.concurrent.spi.ThreadContextController;
/**
* Restores a buffer context that was saved upon creation.
*/
public class BufferContextRestorer implements ThreadContextController {
private StringBuffer bufferToRestore = Buffer.get();
private AtomicBoolean restored = new AtomicBoolean();
/**
* Restore the buffer context that was saved upon construction of this instance.
*/
@Override
public void endContext() {
if (restored.compareAndSet(false, true)) {
Buffer.set(bufferToRestore);
}
else {
throw new IllegalStateException();
}
}
// For easier debug
@Override
public String toString() {
return "BufferContextRestorer@" + Integer.toHexString(System.identityHashCode(this)) +
" for StringBuffer@" + Integer.toHexString(System.identityHashCode(bufferToRestore)) +
": " + bufferToRestore.toString();
}
}