Line data    Source code

       1             : // Copyright (C) 2018 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.logging;
      16             : 
      17             : import com.google.common.base.MoreObjects;
      18             : import com.google.common.collect.ImmutableList;
      19             : import java.util.ArrayList;
      20             : import java.util.List;
      21             : 
      22             : /**
      23             :  * Thread-safe store for performance log records.
      24             :  *
      25             :  * <p>This class is intended to keep track of performance log records in {@link LoggingContext}. It
      26             :  * needs to be thread-safe because it gets shared between threads when the logging context is copied
      27             :  * to another thread (see {@link LoggingContextAwareRunnable} and {@link
      28             :  * LoggingContextAwareCallable}. In this case the logging contexts of both threads share the same
      29             :  * instance of this class. This is important since performance log records are processed only at the
      30             :  * end of a request and performance log records that are created in another thread should not get
      31             :  * lost.
      32             :  */
      33         148 : public class MutablePerformanceLogRecords {
      34         148 :   private final ArrayList<PerformanceLogRecord> performanceLogRecords = new ArrayList<>();
      35             : 
      36             :   public synchronized void add(PerformanceLogRecord record) {
      37           3 :     performanceLogRecords.add(record);
      38           3 :   }
      39             : 
      40             :   public synchronized void set(List<PerformanceLogRecord> records) {
      41           1 :     performanceLogRecords.clear();
      42           1 :     performanceLogRecords.addAll(records);
      43           1 :   }
      44             : 
      45             :   public synchronized ImmutableList<PerformanceLogRecord> list() {
      46          98 :     return ImmutableList.copyOf(performanceLogRecords);
      47             :   }
      48             : 
      49             :   public boolean isEmtpy() {
      50          15 :     return performanceLogRecords.isEmpty();
      51             :   }
      52             : 
      53             :   @Override
      54             :   public String toString() {
      55           0 :     return MoreObjects.toStringHelper(this)
      56           0 :         .add("performanceLogRecords", performanceLogRecords)
      57           0 :         .toString();
      58             :   }
      59             : }