/** Initialize this index, assuming that it has not already been initialized. */
public void initializeIndex() {
synchronized (indexStore) {
if (hasBeenInitialized) {
return;
}
hasBeenInitialized = true;
indexStore.clear();
if (!initializeIndexFrom(getIndexFile())) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("Clearing index after failing to read from index file");
}
indexStore.clear();
if (!initializeBundledLibraries()) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("Failed to initialize bundled libraries");
}
return;
}
if (!indexUserLibraries()) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("Clearing index after failing to index user libraries");
}
indexStore.clear();
initializeBundledLibraries();
}
}
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("After initializing the index");
}
}
}
/**
* Initialize this index to contain information about the bundled libraries. The index store is
* expected to have been cleared before invoking this method.
*
* @return {@code true} if the bundled libraries were successfully indexed
*/
private boolean initializeBundledLibraries() {
synchronized (indexStore) {
hasBeenInitialized = true;
if (!initializeIndexFrom(getInitialIndexFile())) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("Clearing index after failing to read from initial index file");
}
indexStore.clear();
if (!indexBundledLibraries()) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("Clearing index after failing to index bundled libraries");
}
indexStore.clear();
return false;
}
// TODO(brianwilkerson) Restore the following line once we figure out how to know that the
// bundled libraries (and only the bundled libraries) have been indexed.
// writeIndexTo(getInitialIndexFile());
}
}
return true;
}
/** Write index statistics to the log. */
public void logIndexStats(String message) {
int relationshipCount;
int attributeCount;
int elementCount;
int resourceCount;
synchronized (indexStore) {
relationshipCount = indexStore.getRelationshipCount();
attributeCount = indexStore.getAttributeCount();
elementCount = indexStore.getElementCount();
resourceCount = indexStore.getResourceCount();
}
DartCore.logInformation(
message
+ ": "
+ relationshipCount
+ " relationships and "
+ attributeCount
+ " attributes in "
+ elementCount
+ " elements in "
+ resourceCount
+ " resources");
}
/**
* Initialize this index from the given file.
*
* @param indexFile the file from which this index is to be initialized
* @return <code>true</code> if the index was correctly initialized
*/
private boolean initializeIndexFrom(File indexFile) {
if (indexFile == null) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
DartCore.logInformation("Index file was null");
}
return false;
} else if (!indexFile.exists()) {
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
DartCore.logInformation("Index file " + indexFile.getAbsolutePath() + " does not exist");
}
return false;
}
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
DartCore.logInformation(
"About to initialize the index from file "
+ indexFile.getAbsolutePath()
+ " (size = "
+ indexFile.getTotalSpace()
+ " bytes)");
}
try {
boolean wasRead = readIndexFrom(indexFile);
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("After initializing the index from file " + indexFile.getAbsolutePath());
}
synchronized (indexStore) {
return wasRead && indexStore.getResourceCount() > 0;
}
} catch (Exception exception) {
DartCore.logError("Could not read index file " + indexFile.getAbsolutePath(), exception);
}
if (DartCoreDebug.TRACE_INDEX_STATISTICS) {
logIndexStats("Deleting corrupted index file " + indexFile.getAbsolutePath());
}
try {
indexFile.delete();
} catch (Exception exception) {
DartCore.logError(
"Could not delete corrupt index file " + indexFile.getAbsolutePath(), exception);
}
return false;
}
/**
* Write the contents of this index to the given output stream.
*
* @param output the output stream to which this index will be written
* @throws IOException if the index could not be written to the given output stream
*/
private void writeIndex(ObjectOutputStream output) throws IOException {
IndexWriter writer = indexStore.createIndexWriter();
writer.writeIndex(output);
}
/**
* Read the contents of this index from the given input stream.
*
* @param input the input stream from which this index will be read
* @return {@code true} if the file was correctly read
* @throws IOException if the index could not be read from the given input stream
*/
private boolean readIndex(ObjectInputStream input) throws IOException {
IndexReader reader = indexStore.createIndexReader();
return reader.readIndex(input);
}
/**
* Return the number of relationships that are currently recorded in this index.
*
* @return the number of relationships that are currently recorded in this index
*/
public int getRelationshipCount() {
synchronized (indexStore) {
return indexStore.getRelationshipCount();
}
}