/**
* Returns an array containing a <code>TreeInfo</code> element for each <code>Tree</code> in the
* specified volume. If there is no volume with the specified name or if Persistit is not
* initialized then this method returns an empty array.
*
* @param volumeName The name (or unique partial name) of the volume for which information is
* being requested.
* @return The array
*/
@Override
public TreeInfo[] getTreeInfoArray(final String volumeName) throws RemoteException {
if (volumeName == null) {
return new TreeInfo[0];
}
final Volume volume = _persistit.getVolume(volumeName);
if (volume == null) return new TreeInfo[0];
try {
final String[] treeNames = volume.getTreeNames();
TreeInfo[] results = new TreeInfo[treeNames.length + 1];
int count = 0;
results[count++] = new TreeInfo(volume.getDirectoryTree());
for (int index = 0; index < treeNames.length; index++) {
final TreeInfo info = volume.getTreeInfo(treeNames[index]);
if (info != null) {
results[count++] = info;
}
}
if (count < results.length) {
final TreeInfo[] temp = new TreeInfo[count];
System.arraycopy(results, 0, temp, 0, count);
results = temp;
}
return results;
} catch (final PersistitException pe) {
throw new WrappedRemoteException(pe);
}
}
/**
* Return a <code>BufferInfo</code> reflecting the state of a page containing the specified key.
* The <code>volumeName</code> and <code>treeName</code> parameters specify a {@link Tree} in
* which to seach for the key. The <code>level</code> parameter indicates whether the data page,
* or one of the pages on the index path to that data page should be returned. Level 0 refers to
* the data path, level 1 is the lowest index level, and level d-1 where d is the number of levels
* in the the tree represents the three's root page.
*
* <p>Specify <code>treeName</code> as <code>null</code> to access the volume's directory tree.
*
* @param volumeName the name of the volume
* @param treeName the name of the tree within the volume, or <code>null</code> for the directory
* tree
* @param key a <code>KeyState</code> representing a key
* @param level tree level: 0 for root, 1...d-1 for index pages of a tree having depth d.
* @return a <code>BufferInfo</code> object reflecting the selected page, or <code>null</code> if
* the specified tree does not exist.
* @throws RemoteException
*/
@Override
public BufferInfo getBufferInfo(
final String volumeName, final String treeName, final KeyState key, final int level)
throws RemoteException {
try {
Exchange exchange;
final Volume volume = _persistit.getVolume(volumeName);
if (volume == null) {
return null;
}
if (treeName == null) {
exchange = volume.getStructure().directoryExchange();
} else {
exchange = _persistit.getExchange(volume, treeName, false);
}
key.copyTo(exchange.getKey());
final Buffer buffer = exchange.fetchBufferCopy(level);
final BufferInfo info = new BufferInfo();
buffer.populateInfo(info);
return info;
} catch (final TreeNotFoundException tnfe) {
return null;
} catch (final PersistitException pe) {
throw new WrappedRemoteException(pe);
}
}
@Override
public LogicalRecord[] getLogicalRecordArray(
final String volumeName,
final String treeName,
final String keyFilterString,
final KeyState fromKey,
final Key.Direction direction,
final int maxCount,
final int maxValueBytes,
final boolean decodeStrings)
throws RemoteException {
LogicalRecord[] records = new LogicalRecord[maxCount];
int count = 0;
final boolean forward = direction == Key.GT || direction == Key.GTEQ;
Exchange exchange = null;
try {
if (treeName.equals(VolumeStructure.DIRECTORY_TREE_NAME)) {
exchange = _persistit.getVolume(volumeName).getStructure().directoryExchange();
} else {
exchange = _persistit.getExchange(volumeName, treeName, false);
}
exchange.ignoreMVCCFetch(true);
KeyFilter filter = null;
if (keyFilterString != null && keyFilterString.length() > 0) {
filter = new KeyFilter(keyFilterString);
}
fromKey.copyTo(exchange.getKey());
for (; count < maxCount; count++) {
if (!exchange.traverse(direction, filter, maxValueBytes)) {
break;
} else {
final LogicalRecord record = new LogicalRecord();
record._key = new KeyState(exchange.getKey());
record._value = new ValueState(exchange.getValue(), maxValueBytes);
if (decodeStrings) {
record._keyString = _displayFilter.toKeyDisplayString(exchange);
record._valueString = _displayFilter.toValueDisplayString(exchange);
}
if (forward) {
records[count] = record;
} else {
records[maxCount - count - 1] = record;
}
}
}
} catch (final Exception e) {
throw new WrappedRemoteException(e);
} finally {
exchange.ignoreMVCCFetch(false);
}
if (count < maxCount) {
final LogicalRecord[] trimmed = new LogicalRecord[count];
System.arraycopy(records, forward ? 0 : maxCount - count, trimmed, 0, count);
records = trimmed;
}
return records;
}
/**
* Returns an array containing a <code>RecordInfo</code> element for each record in the page
* specified by <code>volumeName</code> and <code>pageAddress</code>. If Persistit is not
* initialized, or if there is no unique <code>Volume</code> for the specified <code>volumeName
* </code>, or if there is no page associated with the specified <code>pageAddress</code> or if
* there is any transient condition that causes the attempt to retrieve records to fail, then this
* method returns an empty array.
*
* @param volumeName
* @param pageAddress
* @return the array
*/
@Override
public RecordInfo[] getRecordInfoArray(final String volumeName, final long pageAddress)
throws RemoteException {
final Volume volume = _persistit.getVolume(volumeName);
if (volume == null) return new RecordInfo[0];
try {
final Buffer buffer = volume.getPool().getBufferCopy(volume, pageAddress);
return buffer.getRecords();
} catch (final PersistitException pe) {
throw new WrappedRemoteException(pe);
}
}
/**
* Returns a <code>BufferInfo</code> reflecting the status of the buffer containing the page
* specified by the supplied <code>volumeName</code> and <code>pageAddress</code>. If Persisit is
* not initialized or of the attempt the find the specified page fails, this method returns <code>
* null</code>
*
* @param volumeName the name of the volume
* @param pageAddress the page address
* @return the BufferInfo for the buffer containing the designated page, of <code>null</code> if
* there is none.
*/
@Override
public BufferInfo getBufferInfo(final String volumeName, final long pageAddress)
throws RemoteException {
final Volume volume = _persistit.getVolume(volumeName);
if (volume == null) return null;
try {
final Buffer buffer = volume.getPool().getBufferCopy(volume, pageAddress);
final BufferInfo info = new BufferInfo();
buffer.populateInfo(info);
return info;
} catch (final PersistitException pe) {
throw new WrappedRemoteException(pe);
}
}
/**
* Returns a <code>TreeInfo</code> for a specified <code>Volume</code> and </code>Tree</code>. If
* Persisit is not initialized, or if no no volume or tree with corresponding names is found, or
* if there is a transient error in acquiring the information, this method returns <code>null
* </code>.
*
* @param volumeName The name (or partial name) of the volume
* @param treeName The name of the tree
* @return the <code>TreeInfo</code>
*/
@Override
public TreeInfo getTreeInfo(final String volumeName, final String treeName)
throws RemoteException {
final Volume volume = _persistit.getVolume(volumeName);
if (volume == null) return null;
try {
Tree tree = null;
if (VolumeStructure.DIRECTORY_TREE_NAME.equals(treeName)) {
tree = volume.getDirectoryTree();
} else {
tree = volume.getTree(treeName, false);
}
if (tree != null) return new TreeInfo(tree);
} catch (final PersistitException pe) {
throw new WrappedRemoteException(pe);
}
return null;
}
/**
* Returns the <code>VolumeInfo</code> for the volume specified by the supplied <code>volumeName
* </code>. If Persisit is not initialized or there is no unique volume corresponding with the
* supplied name, then this method returns <code>null</code>.
*
* @param volumeName
* @return the <code>VolumeInfo</code>
*/
@Override
public VolumeInfo getVolumeInfo(final String volumeName) {
final Volume volume = _persistit.getVolume(volumeName);
if (volume == null) return null;
else return new VolumeInfo(volume);
}
