| /* |
| * Copyright 2016, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package io.grpc; |
| |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * A {@link ThreadLocal}-based context storage implementation. Used by default. |
| */ |
| final class ThreadLocalContextStorage extends Context.Storage { |
| private static final Logger log = Logger.getLogger(ThreadLocalContextStorage.class.getName()); |
| |
| /** |
| * Currently bound context. |
| */ |
| private static final ThreadLocal<Context> localContext = new ThreadLocal<Context>(); |
| |
| @Override |
| public void attach(Context toAttach) { |
| localContext.set(toAttach); |
| } |
| |
| @Override |
| public void detach(Context toDetach, Context toRestore) { |
| if (current() != toDetach) { |
| // Log a severe message instead of throwing an exception as the context to attach is assumed |
| // to be the correct one and the unbalanced state represents a coding mistake in a lower |
| // layer in the stack that cannot be recovered from here. |
| log.log(Level.SEVERE, "Context was not attached when detaching", |
| new Throwable().fillInStackTrace()); |
| } |
| attach(toRestore); |
| } |
| |
| @Override |
| public Context current() { |
| return localContext.get(); |
| } |
| } |