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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.loganalysis.item;
     17 
     18 import org.json.JSONArray;
     19 import org.json.JSONException;
     20 import org.json.JSONObject;
     21 
     22 import java.util.HashMap;
     23 import java.util.Map;
     24 import java.util.Set;
     25 
     26 /**
     27  * An {@link IItem} used to cpuinfo.
     28  */
     29 public class CpuInfoItem implements IItem {
     30     /** Constant for JSON output */
     31     public static final String PROCESSES_KEY = "processes";
     32     /** Constant for JSON output */
     33     public static final String PID_KEY = "pid";
     34     /** Constant for JSON output */
     35     public static final String PERCENT_KEY = "percent";
     36     /** Constant for JSON output */
     37     public static final String NAME_KEY = "name";
     38 
     39     private Map<Integer, Row> mRows = new HashMap<Integer, Row>();
     40 
     41     private static class Row {
     42         public double percent;
     43         public String name;
     44     }
     45 
     46     /**
     47      * {@inheritDoc}
     48      */
     49     @Override
     50     public IItem merge(IItem other) throws ConflictingItemException {
     51         throw new ConflictingItemException("CpuInfo items cannot be merged");
     52     }
     53 
     54     /**
     55      * {@inheritDoc}
     56      */
     57     @Override
     58     public boolean isConsistent(IItem other) {
     59         return false;
     60     }
     61 
     62     /**
     63      * {@inheritDoc}
     64      */
     65     @Override
     66     public JSONObject toJson() {
     67         JSONObject object = new JSONObject();
     68         JSONArray processes = new JSONArray();
     69         for (int pid : getPids()) {
     70             JSONObject proc = new JSONObject();
     71             try {
     72                 proc.put(PID_KEY, pid);
     73                 proc.put(PERCENT_KEY, getPercent(pid));
     74                 proc.put(NAME_KEY, getName(pid));
     75                 processes.put(proc);
     76             } catch (JSONException e) {
     77                 // ignore
     78             }
     79         }
     80 
     81         try {
     82             object.put(PROCESSES_KEY, processes);
     83         } catch (JSONException e) {
     84             // ignore
     85         }
     86         return object;
     87     }
     88 
     89     /**
     90      * Get a set of PIDs seen in the cpuinfo output.
     91      */
     92     public Set<Integer> getPids() {
     93         return mRows.keySet();
     94     }
     95 
     96     /**
     97      * Add a row from the cpuinfo output to the {@link CpuInfoItem}.
     98      *
     99      * @param pid The PID from the output
    100      * @param percent The percentage of CPU usage by the process
    101      * @param name The process name
    102      */
    103     public void addRow(int pid, double percent, String name) {
    104         Row row = new Row();
    105         row.percent = percent;
    106         row.name = name;
    107         mRows.put(pid, row);
    108     }
    109 
    110     /**
    111      * Get the percentage of CPU usage by a given PID.
    112      */
    113     public double getPercent(int pid) {
    114         return mRows.get(pid).percent;
    115     }
    116 
    117     /**
    118      * Get the process name for a given PID.
    119      */
    120     public String getName(int pid) {
    121         return mRows.get(pid).name;
    122     }
    123 }
    124