new trace context

Author: jiaqi-g

pinot-core/src/main/java/com/linkedin/pinot/core/trace/TraceCallable.java

@@ -0,0 +1,63 @@
+/**
+ * Copyright (C) 2014-2015 LinkedIn Corp. ([email protected])
+ *
+ * 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 com.linkedin.pinot.core.trace;
+
+import com.linkedin.pinot.common.request.InstanceRequest;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.Callable;
+
+/**
+ * Wrap a {@link Callable} so that the thread executes this job
+ * will be automatically registered/unregistered to/from a request.
+ *
+ */
+public abstract class TraceCallable<V> implements Callable<V> {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(TraceCallable.class);
+
+  private final InstanceRequest request;
+  private final TraceContext.Trace parent;
+
+  public TraceCallable(InstanceRequest request, TraceContext.Trace parent) {
+    if (request == null) {
+      LOGGER.warn("Passing null requestId to TraceRunnable, maybe forget to register the request in current thread.");
+    }
+    this.request = request;
+    this.parent = parent;
+  }
+
+  /**
+   * Only works when the calling thread has registered the requestId
+   */
+  public TraceCallable() {
+    this(TraceContext.getRequestForCurrentThread(), TraceContext.getLocalTraceForCurrentThread());
+  }
+
+  @Override
+  public V call() throws Exception {
+    TraceContext.registerThreadToRequest(request, parent);
+    try {
+      return callJob();
+    } finally {
+      TraceContext.unregisterThreadFromRequest();
+    }
+  }
+
+  public abstract V callJob() throws Exception;
+
+}