// Path: api/src/main/java/io/opencensus/trace/ContextHandle.java
// public interface ContextHandle {
// 
//   ContextHandle attach();
// 
//   void detach(ContextHandle contextHandle);
// }
// 
// Path: api/src/main/java/io/opencensus/trace/ContextManager.java
// public interface ContextManager {
// 
//   ContextHandle currentContext();
// 
//   ContextHandle withValue(ContextHandle contextHandle, @javax.annotation.Nullable Span span);
// 
//   Span getValue(ContextHandle contextHandle);
// }


import io.grpc.Context;
import io.opencensus.internal.Provider;
import io.opencensus.trace.ContextHandle;
import io.opencensus.trace.ContextManager;
import io.opencensus.trace.Span;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/*
 * Copyright 2016-17, OpenCensus 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.opencensus.trace.unsafe;


public class ContextHandleUtils {

  // No instance of this class.
  private ContextHandleUtils() {}

  private static final Logger LOGGER = Logger.getLogger(ContextHandleUtils.class.getName());
  private static final ContextManager CONTEXT_MANAGER =
      loadContextManager(ContextManager.class.getClassLoader());

  private static ContextManager loadContextManager(@Nullable ClassLoader classLoader) {
    try {
      return Provider.createInstance(
          Class.forName(
              "io.opentelemetry.opencensusshim.OpenTelemetryContextManager",
              /*initialize=*/ true,
              classLoader),
          ContextManager.class);
    } catch (ClassNotFoundException e) {
      LOGGER.log(
          Level.FINE,
          "Couldn't load full implementation for OpenTelemetry context manager, now loading "
              + "original implementation.",
          e);
    }
    return new ContextManagerImpl();
  }

// Path: api/src/main/java/io/opencensus/trace/ContextHandle.java
// public interface ContextHandle {
// 
//   ContextHandle attach();
// 
//   void detach(ContextHandle contextHandle);
// }
// 
// Path: api/src/main/java/io/opencensus/trace/ContextManager.java
// public interface ContextManager {
// 
//   ContextHandle currentContext();
// 
//   ContextHandle withValue(ContextHandle contextHandle, @javax.annotation.Nullable Span span);
// 
//   Span getValue(ContextHandle contextHandle);
// }


// Path: api/src/main/java/io/opencensus/trace/unsafe/ContextHandleUtils.java
import io.grpc.Context;
import io.opencensus.internal.Provider;
import io.opencensus.trace.ContextHandle;
import io.opencensus.trace.ContextManager;
import io.opencensus.trace.Span;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;

/*
 * Copyright 2016-17, OpenCensus 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.opencensus.trace.unsafe;


public class ContextHandleUtils {

  // No instance of this class.
  private ContextHandleUtils() {}

  private static final Logger LOGGER = Logger.getLogger(ContextHandleUtils.class.getName());
  private static final ContextManager CONTEXT_MANAGER =
      loadContextManager(ContextManager.class.getClassLoader());

  private static ContextManager loadContextManager(@Nullable ClassLoader classLoader) {
    try {
      return Provider.createInstance(
          Class.forName(
              "io.opentelemetry.opencensusshim.OpenTelemetryContextManager",
              /*initialize=*/ true,
              classLoader),
          ContextManager.class);
    } catch (ClassNotFoundException e) {
      LOGGER.log(
          Level.FINE,
          "Couldn't load full implementation for OpenTelemetry context manager, now loading "
              + "original implementation.",
          e);
    }
    return new ContextManagerImpl();
  }

  public static ContextHandle currentContext() {