Examples of org.apache.lucene.search.CachingCollector$SegStart

org.apache.lucene.search.CachingCollector
Caches all docs, and optionally also scores, coming from a search, and is then able to replay them to another collector. You specify the max RAM this class may use. Once the collection is done, call {@link #isCached}. If this returns true, you can use {@link #replay} against anew collector. If it returns false, this means too much RAM was required and you must instead re-run the original search.
NOTE: this class consumes 4 (or 8 bytes, if scoring is cached) per collected document. If the result set is large this can easily be a very substantial amount of RAM!
NOTE: this class caches at least 128 documents before checking RAM limits.
See the Lucene contrib/grouping module for more details including a full code example.
@lucene.experimental

    
  }


  public void testBasic() throws Exception {
    for (boolean cacheScores : new boolean[] { false, true }) {
      CachingCollector cc = CachingCollector.create(new NoOpCollector(false), cacheScores, 1);
      cc.setScorer(new MockScorer());
      
      // collect 1000 docs
      for (int i = 0; i < 1000; i++) {
        cc.collect(i);
      }
      
      // now replay them
      cc.replay(new Collector() {
        int prevDocID = -1;
        
        @Override
        public void setScorer(Scorer scorer) throws IOException {}

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      });
    }
  }
  
  public void testIllegalStateOnReplay() throws Exception {
    CachingCollector cc = CachingCollector.create(new NoOpCollector(false), true, 50 * ONE_BYTE);
    cc.setScorer(new MockScorer());
    
    // collect 130 docs, this should be enough for triggering cache abort.
    for (int i = 0; i < 130; i++) {
      cc.collect(i);
    }
    
    assertFalse("CachingCollector should not be cached due to low memory limit", cc.isCached());
    
    try {
      cc.replay(new NoOpCollector(false));
      fail("replay should fail if CachingCollector is not cached");
    } catch (IllegalStateException e) {
      // expected
    }
  }

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  public void testIllegalCollectorOnReplay() throws Exception {
    // tests that the Collector passed to replay() has an out-of-order mode that
    // is valid with the Collector passed to the ctor
    
    // 'src' Collector does not support out-of-order
    CachingCollector cc = CachingCollector.create(new NoOpCollector(false), true, 50 * ONE_BYTE);
    cc.setScorer(new MockScorer());
    for (int i = 0; i < 10; i++) cc.collect(i);
    cc.replay(new NoOpCollector(true)); // this call should not fail
    cc.replay(new NoOpCollector(false)); // this call should not fail


    // 'src' Collector supports out-of-order
    cc = CachingCollector.create(new NoOpCollector(true), true, 50 * ONE_BYTE);
    cc.setScorer(new MockScorer());
    for (int i = 0; i < 10; i++) cc.collect(i);
    cc.replay(new NoOpCollector(true)); // this call should not fail
    try {
      cc.replay(new NoOpCollector(false)); // this call should fail
      fail("should have failed if an in-order Collector was given to replay(), " +
          "while CachingCollector was initialized with out-of-order collection");
    } catch (IllegalArgumentException e) {
      // ok
    }

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    // set RAM limit enough for 150 docs + random(10000)
    int numDocs = random.nextInt(10000) + 150;
    for (boolean cacheScores : new boolean[] { false, true }) {
      int bytesPerDoc = cacheScores ? 8 : 4;
      CachingCollector cc = CachingCollector.create(new NoOpCollector(false),
          cacheScores, bytesPerDoc * ONE_BYTE * numDocs);
      cc.setScorer(new MockScorer());
      for (int i = 0; i < numDocs; i++) cc.collect(i);
      assertTrue(cc.isCached());
      
      // The 151's document should terminate caching
      cc.collect(numDocs);
      assertFalse(cc.isCached());
    }
  }

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  }


  public void testNoWrappedCollector() throws Exception {
    for (boolean cacheScores : new boolean[] { false, true }) {
      // create w/ null wrapped collector, and test that the methods work
      CachingCollector cc = CachingCollector.create(true, cacheScores, 50 * ONE_BYTE);
      cc.setNextReader(null, 0);
      cc.setScorer(new MockScorer());
      cc.collect(0);
      
      assertTrue(cc.isCached());
      cc.replay(new NoOpCollector(true));
    }
  }

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