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/*
* WarmRoast
* Copyright (C) 2013 Albert Pham <http://www.sk89q.com>
*
* 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 com.sk89q.warmroast;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Represents a node in the overall sampling stack.
*
* <p>The base implementation of this class is only used for the root of node structures. The
* {@link StackTraceNode} class is used for representing method calls in the structure.</p>
*/
public class StackNode implements Comparable<StackNode> {
/**
* The name of this node
*/
private final String name;
/**
* A map of this nodes children
*/
private final Map<String, StackNode> children = new HashMap<>();
/**
* The accumulated sample time for this node
*/
private long totalTime = 0;
public StackNode(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
public Collection<StackNode> getChildren() {
if (this.children.isEmpty()) {
return Collections.emptyList();
}
List<StackNode> list = new ArrayList<>(this.children.values());
list.sort(null);
return list;
}
private StackNode resolveChild(String name) {
return this.children.computeIfAbsent(name, StackNode::new);
}
private StackNode resolveChild(String className, String methodName) {
return this.children.computeIfAbsent(StackTraceNode.formName(className, methodName), name -> new StackTraceNode(className, methodName));
}
public long getTotalTime() {
return this.totalTime;
}
public void accumulateTime(long time) {
this.totalTime += time;
}
private void log(StackTraceElement[] elements, int skip, long time) {
accumulateTime(time);
if (elements.length - skip == 0) {
return;
}
StackTraceElement bottom = elements[elements.length - (skip + 1)];
resolveChild(bottom.getClassName(), bottom.getMethodName()).log(elements, skip + 1, time);
}
public void log(StackTraceElement[] elements, long time) {
log(elements, 0, time);
}
@Override
public int compareTo(StackNode o) {
return getName().compareTo(o.getName());
}
public JsonObject serialize() {
JsonObject ret = new JsonObject();
// append metadata about this node
ret.addProperty("name", getName());
appendMetadata(ret);
// include the total time recorded for this node
ret.addProperty("totalTime", getTotalTime());
// append child nodes, if any are present
Collection<StackNode> childNodes = getChildren();
if (!childNodes.isEmpty()) {
JsonArray children = new JsonArray();
for (StackNode child : childNodes) {
children.add(child.serialize());
}
ret.add("children", children);
}
return ret;
}
protected void appendMetadata(JsonObject obj) {
}
}
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