| /* |
| * 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. |
| */ |
| package org.apache.ace.log.target.task; |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.OutputStreamWriter; |
| import java.net.ConnectException; |
| import java.net.HttpURLConnection; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.util.List; |
| |
| import org.amdatu.scheduling.Job; |
| import org.apache.ace.connectionfactory.ConnectionFactory; |
| import org.apache.ace.discovery.Discovery; |
| import org.apache.ace.feedback.Descriptor; |
| import org.apache.ace.feedback.Event; |
| import org.apache.ace.identification.Identification; |
| import org.apache.ace.log.target.store.LogStore; |
| import org.apache.ace.range.RangeIterator; |
| import org.apache.ace.range.SortedRangeSet; |
| import org.osgi.service.log.LogService; |
| |
| // TODO there are two versions of this class around, the other ohne being the server.LogSyncTask, |
| // and both are fairly similar |
| public class LogSyncTask implements Job { |
| |
| private static final String COMMAND_QUERY = "query"; |
| private static final String COMMAND_SEND = "send"; |
| private static final String PARAMETER_TARGETID = "tid"; |
| private static final String PARAMETER_LOGID = "logid"; |
| |
| // injected by dependencymanager |
| private volatile Discovery m_discovery; |
| private volatile Identification m_identification; |
| private volatile LogService m_log; |
| private volatile LogStore m_LogStore; |
| private volatile ConnectionFactory m_connectionFactory; |
| |
| private final String m_endpoint; |
| |
| public LogSyncTask(String endpoint) { |
| m_endpoint = endpoint; |
| } |
| |
| /** |
| * Synchronize the log events available remote with the events available locally. |
| */ |
| @Override |
| public void execute() { |
| URL host = m_discovery.discover(); |
| |
| if (host == null) { |
| // expected if there's no discovered |
| // ps or relay server |
| m_log.log(LogService.LOG_WARNING, "Unable to synchronize log with remote (endpoint=" + m_endpoint + ") - none available"); |
| return; |
| } |
| |
| if ("file".equals(host.getProtocol())) { |
| // if the discovery URL is a file, we cannot sync, so we silently return here |
| return; |
| } |
| |
| String targetId = m_identification.getID(); |
| URLConnection sendConnection = null; |
| try { |
| sendConnection = m_connectionFactory.createConnection(new URL(host, m_endpoint + "/" + COMMAND_SEND)); |
| sendConnection.setDoOutput(true); |
| if (sendConnection instanceof HttpURLConnection) { |
| // ACE-294: enable streaming mode causing only small amounts of memory to be |
| // used for this commit. Otherwise, the entire input stream is cached into |
| // memory prior to sending it to the server... |
| ((HttpURLConnection) sendConnection).setChunkedStreamingMode(8192); |
| } |
| |
| long[] logIDs = m_LogStore.getLogIDs(); |
| for (int i = 0; i < logIDs.length; i++) { |
| URL url = new URL(host, m_endpoint + "/" + COMMAND_QUERY + "?" + PARAMETER_TARGETID + "=" + targetId + "&" + PARAMETER_LOGID + "=" + logIDs[i]); |
| |
| URLConnection queryConnection = m_connectionFactory.createConnection(url); |
| // TODO: make sure no actual call is made using sendConnection |
| // when there's nothing to sync |
| synchronizeLog(logIDs[i], queryConnection.getInputStream(), sendConnection); |
| } |
| |
| // Make sure to send the actual POST request... |
| sendConnection.getContent(); |
| } |
| catch (ConnectException e) { |
| m_log.log(LogService.LOG_WARNING, "Unable to connect to remote (endpoint=" + m_endpoint + ")"); |
| } |
| catch (IOException e) { |
| m_log.log(LogService.LOG_ERROR, "Unable to (fully) synchronize log with remote (endpoint=" + m_endpoint + ")", e); |
| } |
| finally { |
| if (sendConnection instanceof HttpURLConnection) { |
| ((HttpURLConnection) sendConnection).disconnect(); |
| } |
| } |
| } |
| |
| /** |
| * Synchronizes a single log (there can be multiple log/logid's per target). |
| * |
| * @param logID |
| * ID of the log to synchronize. |
| * @param queryInput |
| * Stream pointing to a query result for the events available remotely for this log id |
| * @param sendConnection |
| * .getOutputStream() Stream to write the events to that are missing on the remote side. |
| * @throws java.io.IOException |
| * If synchronization could not be completed due to an I/O failure. |
| */ |
| protected void synchronizeLog(long logID, InputStream queryInput, URLConnection sendConnection) throws IOException { |
| long highestLocal = m_LogStore.getHighestID(logID); |
| if (highestLocal == 0) { |
| // No events, no need to synchronize |
| return; |
| } |
| |
| SortedRangeSet localRange = new SortedRangeSet("1-" + highestLocal); |
| SortedRangeSet remoteRange = getDescriptor(queryInput).getRangeSet(); |
| SortedRangeSet delta = remoteRange.diffDest(localRange); |
| RangeIterator rangeIterator = delta.iterator(); |
| |
| BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(sendConnection.getOutputStream())); |
| |
| if (rangeIterator.hasNext()) { |
| long lowest = rangeIterator.next(); |
| long highest = delta.getHigh(); |
| if (lowest <= highest) { |
| List<Event> events = m_LogStore.get(logID, lowest, highestLocal > highest ? highest : highestLocal); |
| for (Event current : events) { |
| while ((current.getID() > lowest) && rangeIterator.hasNext()) { |
| lowest = rangeIterator.next(); |
| } |
| if (current.getID() == lowest) { |
| // before we send the LogEvent to the other side, we fill out the |
| // appropriate identification |
| Event event = new Event(m_identification.getID(), current); |
| writer.write(event.toRepresentation() + "\n"); |
| } |
| } |
| } |
| } |
| |
| writer.flush(); |
| } |
| |
| /** |
| * Retrieves a LogDescriptor object from the specified stream. |
| * |
| * @param queryInput |
| * Stream containing a LogDescriptor object. |
| * @return LogDescriptor object reflecting the range contained in the stream. |
| * @throws java.io.IOException |
| * If no range could be determined due to an I/O failure. |
| */ |
| protected Descriptor getDescriptor(InputStream queryInput) throws IOException { |
| BufferedReader queryReader = null; |
| try { |
| queryReader = new BufferedReader(new InputStreamReader(queryInput)); |
| String rangeString = queryReader.readLine(); |
| if (rangeString != null) { |
| try { |
| return new Descriptor(rangeString); |
| } |
| catch (IllegalArgumentException iae) { |
| throw new IOException("Could not determine highest remote event id, received malformed event range (" + rangeString + ")"); |
| } |
| } |
| else { |
| throw new IOException("Could not construct LogDescriptor from stream because stream is empty"); |
| } |
| } |
| finally { |
| if (queryReader != null) { |
| try { |
| queryReader.close(); |
| } |
| catch (Exception ex) { |
| // not much we can do |
| } |
| } |
| } |
| } |
| } |