75 lines
1.8 KiB
Java
75 lines
1.8 KiB
Java
package it.cavallium.dbengine.database.disk;
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import java.io.IOException;
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import org.apache.lucene.index.DirectoryReader;
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import org.apache.lucene.index.IndexCommit;
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import org.apache.lucene.search.IndexSearcher;
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public class LuceneIndexSnapshot {
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private final IndexCommit snapshot;
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private boolean initialized;
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private boolean failed;
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private boolean closed;
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private DirectoryReader indexReader;
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private IndexSearcher indexSearcher;
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public LuceneIndexSnapshot(IndexCommit snapshot) {
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this.snapshot = snapshot;
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}
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public IndexCommit getSnapshot() {
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return snapshot;
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}
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/**
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* Can be called only if the snapshot has not been closed
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* @throws IllegalStateException if closed or failed
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*/
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public synchronized DirectoryReader getIndexReader() throws IllegalStateException {
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openDirectoryIfNeeded();
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return indexReader;
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}
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/**
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* Can be called only if the snapshot has not been closed
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* @throws IllegalStateException if closed or failed
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*/
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public synchronized IndexSearcher getIndexSearcher() throws IllegalStateException {
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openDirectoryIfNeeded();
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return indexSearcher;
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}
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private synchronized void openDirectoryIfNeeded() throws IllegalStateException {
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if (closed) {
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throw new IllegalStateException("Snapshot is closed");
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}
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if (failed) {
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throw new IllegalStateException("Snapshot failed to open");
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}
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if (!initialized) {
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try {
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indexReader = DirectoryReader.open(snapshot);
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indexSearcher = new IndexSearcher(indexReader);
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initialized = true;
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} catch (IOException e) {
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failed = true;
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throw new RuntimeException(e);
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}
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}
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}
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public synchronized void close() throws IOException {
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closed = true;
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if (initialized && !failed) {
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indexReader.close();
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indexReader = null;
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indexSearcher = null;
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}
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}
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}
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