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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.sampler.node;
import me.lucko.spark.common.sampler.window.ProtoTimeEncoder;
import me.lucko.spark.common.util.MethodDisambiguator;
import me.lucko.spark.proto.SparkSamplerProtos;
import org.checkerframework.checker.nullness.qual.Nullable;
import java.util.Objects;
/**
* Represents a stack trace element within the {@link AbstractNode node} structure.
*/
public final class StackTraceNode extends AbstractNode {
/**
* Magic number to denote "no present" line number for a node.
*/
public static final int NULL_LINE_NUMBER = -1;
/** A description of the element */
private final Description description;
public StackTraceNode(Description description) {
this.description = description;
}
public String getClassName() {
return this.description.className;
}
public String getMethodName() {
return this.description.methodName;
}
public String getMethodDescription() {
return this.description.methodDescription;
}
public int getLineNumber() {
return this.description.lineNumber;
}
public int getParentLineNumber() {
return this.description.parentLineNumber;
}
public SparkSamplerProtos.StackTraceNode toProto(MergeMode mergeMode, ProtoTimeEncoder timeEncoder, Iterable<Integer> childrenRefs) {
SparkSamplerProtos.StackTraceNode.Builder proto = SparkSamplerProtos.StackTraceNode.newBuilder()
.setClassName(this.description.className)
.setMethodName(this.description.methodName);
double[] times = encodeTimesForProto(timeEncoder);
for (double time : times) {
proto.addTimes(time);
}
if (this.description.lineNumber >= 0) {
proto.setLineNumber(this.description.lineNumber);
}
if (mergeMode.separateParentCalls() && this.description.parentLineNumber >= 0) {
proto.setParentLineNumber(this.description.parentLineNumber);
}
if (this.description.methodDescription != null) {
proto.setMethodDesc(this.description.methodDescription);
} else {
mergeMode.getMethodDisambiguator().disambiguate(this)
.map(MethodDisambiguator.MethodDescription::getDesc)
.ifPresent(proto::setMethodDesc);
}
proto.addAllChildrenRefs(childrenRefs);
return proto.build();
}
/**
* Function to construct a {@link StackTraceNode.Description} from a stack trace element
* of type {@code T}.
*
* @param <T> the stack trace element type, e.g. {@link java.lang.StackTraceElement}
*/
@FunctionalInterface
public interface Describer<T> {
/**
* Create a description for the given element.
*
* @param element the element
* @param parent the parent element
* @return the description
*/
Description describe(T element, @Nullable T parent);
}
/**
* Encapsulates the attributes of a {@link StackTraceNode}.
*/
public static final class Description {
private final String className;
private final String methodName;
// async-profiler
private final String methodDescription;
// Java
private final int lineNumber;
private final int parentLineNumber;
private final int hash;
// Constructor used by the Java sampler
public Description(String className, String methodName, int lineNumber, int parentLineNumber) {
this.className = className;
this.methodName = methodName;
this.methodDescription = null;
this.lineNumber = lineNumber;
this.parentLineNumber = parentLineNumber;
this.hash = Objects.hash(this.className, this.methodName, this.lineNumber, this.parentLineNumber);
}
// Constructor used by the async-profiler sampler
public Description(String className, String methodName, String methodDescription) {
this.className = className;
this.methodName = methodName;
this.methodDescription = methodDescription;
this.lineNumber = StackTraceNode.NULL_LINE_NUMBER;
this.parentLineNumber = StackTraceNode.NULL_LINE_NUMBER;
this.hash = Objects.hash(this.className, this.methodName, this.methodDescription);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Description description = (Description) o;
return this.hash == description.hash &&
this.lineNumber == description.lineNumber &&
this.parentLineNumber == description.parentLineNumber &&
this.className.equals(description.className) &&
this.methodName.equals(description.methodName) &&
Objects.equals(this.methodDescription, description.methodDescription);
}
@Override
public int hashCode() {
return this.hash;
}
}
}
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