| using System; |
| using System.Collections.Generic; |
| using System.Diagnostics; |
| |
| namespace Lucene.Net.Index |
| { |
| using InfoStream = Lucene.Net.Util.InfoStream; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| using ThreadState = Lucene.Net.Index.DocumentsWriterPerThreadPool.ThreadState; |
| |
| /// <summary> |
| /// <seealso cref="FlushPolicy"/> controls when segments are flushed from a RAM resident |
| /// internal data-structure to the <seealso cref="IndexWriter"/>s <seealso cref="Directory"/>. |
| /// <p> |
| /// Segments are traditionally flushed by: |
| /// <ul> |
| /// <li>RAM consumption - configured via |
| /// <seealso cref="IndexWriterConfig#setRAMBufferSizeMB(double)"/></li> |
| /// <li>Number of RAM resident documents - configured via |
| /// <seealso cref="IndexWriterConfig#setMaxBufferedDocs(int)"/></li> |
| /// </ul> |
| /// The policy also applies pending delete operations (by term and/or query), |
| /// given the threshold set in |
| /// <seealso cref="IndexWriterConfig#setMaxBufferedDeleteTerms(int)"/>. |
| /// <p> |
| /// <seealso cref="IndexWriter"/> consults the provided <seealso cref="FlushPolicy"/> to control the |
| /// flushing process. The policy is informed for each added or updated document |
| /// as well as for each delete term. Based on the <seealso cref="FlushPolicy"/>, the |
| /// information provided via <seealso cref="ThreadState"/> and |
| /// <seealso cref="DocumentsWriterFlushControl"/>, the <seealso cref="FlushPolicy"/> decides if a |
| /// <seealso cref="DocumentsWriterPerThread"/> needs flushing and mark it as flush-pending |
| /// via <seealso cref="DocumentsWriterFlushControl#setFlushPending"/>, or if deletes need |
| /// to be applied. |
| /// </summary> |
| /// <seealso cref= ThreadState </seealso> |
| /// <seealso cref= DocumentsWriterFlushControl </seealso> |
| /// <seealso cref= DocumentsWriterPerThread </seealso> |
| /// <seealso cref= IndexWriterConfig#setFlushPolicy(FlushPolicy) </seealso> |
| public abstract class FlushPolicy : ICloneable |
| { |
| protected internal LiveIndexWriterConfig IWConfig; |
| protected internal InfoStream InfoStream; |
| |
| /// <summary> |
| /// Called for each delete term. If this is a delete triggered due to an update |
| /// the given <seealso cref="ThreadState"/> is non-null. |
| /// <p> |
| /// Note: this method is called synchronized on the given |
| /// <seealso cref="DocumentsWriterFlushControl"/> and it is guaranteed that the calling |
| /// thread holds the lock on the given <seealso cref="ThreadState"/> |
| /// </summary> |
| public abstract void OnDelete(DocumentsWriterFlushControl control, ThreadState state); |
| |
| /// <summary> |
| /// Called for each document update on the given <seealso cref="ThreadState"/>'s |
| /// <seealso cref="DocumentsWriterPerThread"/>. |
| /// <p> |
| /// Note: this method is called synchronized on the given |
| /// <seealso cref="DocumentsWriterFlushControl"/> and it is guaranteed that the calling |
| /// thread holds the lock on the given <seealso cref="ThreadState"/> |
| /// </summary> |
| public virtual void OnUpdate(DocumentsWriterFlushControl control, ThreadState state) |
| { |
| OnInsert(control, state); |
| OnDelete(control, state); |
| } |
| |
| /// <summary> |
| /// Called for each document addition on the given <seealso cref="ThreadState"/>s |
| /// <seealso cref="DocumentsWriterPerThread"/>. |
| /// <p> |
| /// Note: this method is synchronized by the given |
| /// <seealso cref="DocumentsWriterFlushControl"/> and it is guaranteed that the calling |
| /// thread holds the lock on the given <seealso cref="ThreadState"/> |
| /// </summary> |
| public abstract void OnInsert(DocumentsWriterFlushControl control, ThreadState state); |
| |
| /// <summary> |
| /// Called by DocumentsWriter to initialize the FlushPolicy |
| /// </summary> |
| protected internal virtual void Init(LiveIndexWriterConfig indexWriterConfig) |
| { |
| lock (this) |
| { |
| this.IWConfig = indexWriterConfig; |
| InfoStream = indexWriterConfig.InfoStream; |
| } |
| } |
| |
| /// <summary> |
| /// Returns the current most RAM consuming non-pending <seealso cref="ThreadState"/> with |
| /// at least one indexed document. |
| /// <p> |
| /// this method will never return <code>null</code> |
| /// </summary> |
| protected internal virtual ThreadState FindLargestNonPendingWriter(DocumentsWriterFlushControl control, ThreadState perThreadState) |
| { |
| Debug.Assert(perThreadState.Dwpt.NumDocsInRAM > 0); |
| long maxRamSoFar = perThreadState.BytesUsed; |
| // the dwpt which needs to be flushed eventually |
| ThreadState maxRamUsingThreadState = perThreadState; |
| Debug.Assert(!perThreadState.FlushPending_Renamed, "DWPT should have flushed"); |
| IEnumerator<ThreadState> activePerThreadsIterator = control.AllActiveThreadStates(); |
| while (activePerThreadsIterator.MoveNext()) |
| { |
| ThreadState next = activePerThreadsIterator.Current; |
| if (!next.FlushPending_Renamed) |
| { |
| long nextRam = next.BytesUsed; |
| if (nextRam > maxRamSoFar && next.Dwpt.NumDocsInRAM > 0) |
| { |
| maxRamSoFar = nextRam; |
| maxRamUsingThreadState = next; |
| } |
| } |
| } |
| Debug.Assert(AssertMessage("set largest ram consuming thread pending on lower watermark")); |
| return maxRamUsingThreadState; |
| } |
| |
| private bool AssertMessage(string s) |
| { |
| if (InfoStream.IsEnabled("FP")) |
| { |
| InfoStream.Message("FP", s); |
| } |
| return true; |
| } |
| |
| public object Clone() |
| { |
| FlushPolicy clone; |
| |
| clone = (FlushPolicy)base.MemberwiseClone(); |
| clone.IWConfig = null; |
| clone.InfoStream = null; |
| return clone; |
| } |
| } |
| } |