Source code

001/**
002 * Logback: the reliable, generic, fast and flexible logging framework. Copyright (C) 1999-2015, QOS.ch. All rights
003 * reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under either the terms of the Eclipse Public License
006 * v1.0 as published by the Eclipse Foundation
007 *
008 * or (per the licensee's choosing)
009 *
010 * under the terms of the GNU Lesser General Public License version 2.1 as published by the Free Software Foundation.
011 */
012package ch.qos.logback.core.rolling;
013
014import static ch.qos.logback.core.CoreConstants.CODES_URL;
015import static ch.qos.logback.core.CoreConstants.MORE_INFO_PREFIX;
016
017import java.io.File;
018import java.io.IOException;
019import java.util.Map;
020import java.util.Map.Entry;
021import java.util.concurrent.locks.Lock;
022import java.util.concurrent.locks.ReentrantLock;
023
024import ch.qos.logback.core.CoreConstants;
025import ch.qos.logback.core.FileAppender;
026import ch.qos.logback.core.rolling.helper.CompressionMode;
027import ch.qos.logback.core.rolling.helper.FileNamePattern;
028import ch.qos.logback.core.util.ContextUtil;
029
030/**
031 * <code>RollingFileAppender</code> extends {@link FileAppender} to back up the
032 * log files depending on {@link RollingPolicy} and {@link TriggeringPolicy}.
033 *
034 * <p>
035 * For more information about this appender, please refer to the online manual
036 * at http://logback.qos.ch/manual/appenders.html#RollingFileAppender
037 *
038 * @author Heinz Richter
039 * @author Ceki G&uuml;lc&uuml;
040 */
041public class RollingFileAppender<E> extends FileAppender<E> {
042    File currentlyActiveFile;
043    TriggeringPolicy<E> triggeringPolicy;
044    RollingPolicy rollingPolicy;
045
046    Lock triggeringPolicyLock = new ReentrantLock();
047
048    static private String RFA_NO_TP_URL = CODES_URL + "#rfa_no_tp";
049    static private String RFA_NO_RP_URL = CODES_URL + "#rfa_no_rp";
050    static private String COLLISION_URL = CODES_URL + "#rfa_collision";
051    static private String RFA_LATE_FILE_URL = CODES_URL + "#rfa_file_after";
052    static private String RFA_RESET_RP_OR_TP = CODES_URL + "#rfa_reset_rp_or_tp";
053
054    public void start() {
055        if (triggeringPolicy == null) {
056            addWarn("No TriggeringPolicy was set for the RollingFileAppender named " + getName());
057            addWarn(MORE_INFO_PREFIX + RFA_NO_TP_URL);
058            return;
059        }
060        if (!triggeringPolicy.isStarted()) {
061            addWarn("TriggeringPolicy has not started. RollingFileAppender will not start");
062            return;
063        }
064
065        if (checkForCollisionsInPreviousRollingFileAppenders()) {
066            addError("Collisions detected with FileAppender/RollingAppender instances defined earlier. Aborting.");
067            addError(MORE_INFO_PREFIX + COLLISION_WITH_EARLIER_APPENDER_URL);
068            return;
069        }
070
071        // we don't want to void existing log files
072        if (!append) {
073            addWarn("Append mode is mandatory for RollingFileAppender. Defaulting to append=true.");
074            append = true;
075        }
076
077        if (rollingPolicy == null) {
078            addError("No RollingPolicy was set for the RollingFileAppender named " + getName());
079            addError(MORE_INFO_PREFIX + RFA_NO_RP_URL);
080            return;
081        }
082
083        // sanity check for http://jira.qos.ch/browse/LOGBACK-796
084        if (checkForFileAndPatternCollisions()) {
085            addError("File property collides with fileNamePattern. Aborting.");
086            addError(MORE_INFO_PREFIX + COLLISION_URL);
087            return;
088        }
089
090        if (isPrudent()) {
091            if (rawFileProperty() != null) {
092                addWarn("Setting \"File\" property to null on account of prudent mode");
093                setFile(null);
094            }
095            if (rollingPolicy.getCompressionMode() != CompressionMode.NONE) {
096                addError("Compression is not supported in prudent mode. Aborting");
097                return;
098            }
099        }
100
101        currentlyActiveFile = new File(getFile());
102        addInfo("Active log file name: " + getFile());
103        super.start();
104    }
105
106    private boolean checkForFileAndPatternCollisions() {
107        if (triggeringPolicy instanceof RollingPolicyBase) {
108            final RollingPolicyBase base = (RollingPolicyBase) triggeringPolicy;
109            final FileNamePattern fileNamePattern = base.fileNamePattern;
110            // no use checking if either fileName or fileNamePattern are null
111            if (fileNamePattern != null && fileName != null) {
112                String regex = fileNamePattern.toRegex();
113                return fileName.matches(regex);
114            }
115        }
116        return false;
117    }
118
119    private boolean checkForCollisionsInPreviousRollingFileAppenders() {
120        boolean collisionResult = false;
121        if (triggeringPolicy instanceof RollingPolicyBase) {
122            final RollingPolicyBase base = (RollingPolicyBase) triggeringPolicy;
123            final FileNamePattern fileNamePattern = base.fileNamePattern;
124            boolean collisionsDetected = innerCheckForFileNamePatternCollisionInPreviousRFA(fileNamePattern);
125            if (collisionsDetected)
126                collisionResult = true;
127        }
128        return collisionResult;
129    }
130
131    private boolean innerCheckForFileNamePatternCollisionInPreviousRFA(FileNamePattern fileNamePattern) {
132        boolean collisionsDetected = false;
133        @SuppressWarnings("unchecked")
134        Map<String, FileNamePattern> map = (Map<String, FileNamePattern>) context.getObject(
135                CoreConstants.RFA_FILENAME_PATTERN_COLLISION_MAP);
136        if (map == null) {
137            return collisionsDetected;
138        }
139        for (Entry<String, FileNamePattern> entry : map.entrySet()) {
140            if (fileNamePattern.equals(entry.getValue())) {
141                addErrorForCollision("FileNamePattern", entry.getValue().toString(), entry.getKey());
142                collisionsDetected = true;
143            }
144        }
145        if (name != null) {
146            map.put(getName(), fileNamePattern);
147        }
148        return collisionsDetected;
149    }
150
151    @Override
152    public void stop() {
153        if (!isStarted()) {
154            return;
155        }
156        super.stop();
157
158        if (rollingPolicy != null)
159            rollingPolicy.stop();
160        if (triggeringPolicy != null)
161            triggeringPolicy.stop();
162
163        Map<String, FileNamePattern> map = ContextUtil.getFilenamePatternCollisionMap(context);
164        if (map != null && getName() != null)
165            map.remove(getName());
166
167    }
168
169    @Override
170    public void setFile(String file) {
171        // http://jira.qos.ch/browse/LBCORE-94
172        // allow setting the file name to null if mandated by prudent mode
173        if (file != null && ((triggeringPolicy != null) || (rollingPolicy != null))) {
174            addError("File property must be set before any triggeringPolicy or rollingPolicy properties");
175            addError(MORE_INFO_PREFIX + RFA_LATE_FILE_URL);
176        }
177        super.setFile(file);
178    }
179
180    @Override
181    public String getFile() {
182        return rollingPolicy.getActiveFileName();
183    }
184
185    /**
186     * Implemented by delegating most of the rollover work to a rolling policy.
187     */
188    public void rollover() {
189        streamWriteLock.lock();
190        try {
191            // Note: This method needs to be synchronized because it needs exclusive
192            // access while it closes and then re-opens the target file.
193            //
194            // make sure to close the hereto active log file! Renaming under windows
195            // does not work for open files.
196            this.closeOutputStream();
197            attemptRollover();
198            attemptOpenFile();
199        } finally {
200            streamWriteLock.unlock();
201        }
202    }
203
204    private void attemptOpenFile() {
205        try {
206            // update the currentlyActiveFile LOGBACK-64
207            currentlyActiveFile = new File(rollingPolicy.getActiveFileName());
208
209            // This will also close the file. This is OK since multiple close operations are
210            // safe.
211            this.openFile(rollingPolicy.getActiveFileName());
212        } catch (IOException e) {
213            addError("setFile(" + fileName + ", false) call failed.", e);
214        }
215    }
216
217    private void attemptRollover() {
218        try {
219            rollingPolicy.rollover();
220        } catch (RolloverFailure rf) {
221            addWarn("RolloverFailure occurred. Deferring roll-over.");
222            // we failed to roll-over, let us not truncate and risk data loss
223            this.append = true;
224        }
225    }
226
227    /**
228     * This method differentiates RollingFileAppender from its super class.
229     */
230    @Override
231    protected void subAppend(E event) {
232
233        // We need to synchronize on triggeringPolicy so that only one rollover
234        // occurs at a time. We should also ensure that the triggeringPolicy.isTriggeringEvent
235        // method can ensure that it updates itself properly when isTriggeringEvent returns true
236
237        // The roll-over check must precede actual writing. This is the
238        // only correct behavior for time driven triggers.
239
240        triggeringPolicyLock.lock();
241        try {
242            if (triggeringPolicy.isTriggeringEvent(currentlyActiveFile, event)) {
243                rollover();
244            }
245        } finally {
246            triggeringPolicyLock.unlock();
247        }
248
249        super.subAppend(event);
250    }
251
252    public RollingPolicy getRollingPolicy() {
253        return rollingPolicy;
254    }
255
256    public TriggeringPolicy<E> getTriggeringPolicy() {
257        return triggeringPolicy;
258    }
259
260    /**
261     * Sets the rolling policy. In case the 'policy' argument also implements
262     * {@link TriggeringPolicy}, then the triggering policy for this appender is
263     * automatically set to be the policy argument.
264     *
265     * @param policy
266     */
267    @SuppressWarnings("unchecked")
268    public void setRollingPolicy(RollingPolicy policy) {
269        if (rollingPolicy instanceof TriggeringPolicy) {
270            String className = rollingPolicy.getClass().getSimpleName();
271            addWarn("A rolling policy of type " + className + " was already set.");
272            addWarn("Note that " + className + " doubles as a TriggeringPolicy");
273            addWarn("See also "+RFA_RESET_RP_OR_TP);
274        }
275        rollingPolicy = policy;
276        if (rollingPolicy instanceof TriggeringPolicy) {
277            triggeringPolicy = (TriggeringPolicy<E>) policy;
278        }
279
280    }
281
282    public void setTriggeringPolicy(TriggeringPolicy<E> policy) {
283        if (triggeringPolicy instanceof RollingPolicy) {
284            String className = triggeringPolicy.getClass().getSimpleName();
285            addWarn("A triggering policy of type " + className + " was already set.");
286            addWarn("Note that " + className + " doubles as a RollingPolicy");
287            addWarn("See also "+RFA_RESET_RP_OR_TP);
288        }
289        triggeringPolicy = policy;
290        if (policy instanceof RollingPolicy) {
291            rollingPolicy = (RollingPolicy) policy;
292        }
293    }
294}