Java tutorial
/* * Copyright (c) 2016 Yahoo Inc. * Licensed under the terms of the Apache version 2.0 license. * See LICENSE file for terms. */ package com.yahoo.yqlplus.engine.sources; import com.google.common.collect.ImmutableList; import com.google.inject.Inject; import com.yahoo.yqlplus.api.Source; import com.yahoo.yqlplus.api.annotations.Query; import com.yahoo.yqlplus.api.trace.Tracer; import com.yahoo.yqlplus.engine.java.Person; import java.util.List; public class TracingSource implements Source { private final Tracer tracer; @Inject TracingSource(Tracer tracer) { this.tracer = tracer; } @Query public List<Person> scan() { try (Tracer trace = tracer.start("MINE", "MINE")) { trace.fine("Done scanning"); return ImmutableList.of(new Person("1", "joe", 0)); } } }