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BufferContextSnapshot.java
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BufferContextSnapshot.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 org.eclipse.microprofile.context.tck.contexts.buffer.Buffer;
import org.eclipse.microprofile.concurrent.spi.ThreadContextController;
import org.eclipse.microprofile.concurrent.spi.ThreadContextSnapshot;
/**
* Represents a saved 'buffer' instance.
*/
public class BufferContextSnapshot implements ThreadContextSnapshot {
private final StringBuffer buffer;
BufferContextSnapshot(StringBuffer buffer) {
this.buffer = buffer;
}
/**
* Apply the requested buffer context to the current thread,
* first storing a copying of the buffer that was previously associated with the thread,
* to later be restored via the returned ThreadContextController.
*/
@Override
public ThreadContextController begin() {
ThreadContextController contextRestorer = new BufferContextRestorer();
Buffer.set(buffer == null ? new StringBuffer() : buffer);
return contextRestorer;
}
// For easier debug
@Override
public String toString() {
String s = "BufferContextSnapshot@" + Integer.toHexString(System.identityHashCode(this));
if (buffer == null) {
s += " CLEARED";
}
else {
s += " for StringBuffer@" + Integer.toHexString(System.identityHashCode(buffer)) + ": " + buffer.toString();
}
return s;
}
}