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v1.3alpha8 :: src / java / org / apache / log4j / rolling /

RollingFileAppender.java

/*
 * Copyright 1999,2006 The Apache Software Foundation.
 *
 * Licensed 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.log4j.rolling;

import org.apache.log4j.FileAppender;
import org.apache.log4j.rolling.helper.Action;
import org.apache.log4j.spi.LoggingEvent;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;


/**
 * <code>RollingFileAppender</code> extends {@link FileAppender} to backup the log files
 * depending on {@link RollingPolicy} and {@link TriggeringPolicy}.
 * <p>
 * To be of any use, a <code>RollingFileAppender</code> instance must have both
 * a <code>RollingPolicy</code> and a <code>TriggeringPolicy</code> set up.
 * However, if its <code>RollingPolicy</code> also implements the
 * <code>TriggeringPolicy</code> interface, then only the former needs to be
 * set up. For example, {@link TimeBasedRollingPolicy} acts both as a
 * <code>RollingPolicy</code> and a <code>TriggeringPolicy</code>.
 *
 * <p><code>RollingFileAppender</code> can be configured programattically or
 * using {@link org.apache.log4j.joran.JoranConfigurator}. Here is a sample
 * configration file:

<pre>&lt;?xml version="1.0" encoding="UTF-8" ?>
&lt;!DOCTYPE log4j:configuration>

&lt;log4j:configuration debug="true">

  &lt;appender name="ROLL" class="org.apache.log4j.rolling.RollingFileAppender">
    <b>&lt;rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
      &lt;param name="FileNamePattern" value="/wombat/foo.%d{yyyy-MM}.gz"/>
    &lt;/rollingPolicy></b>

    &lt;layout class="org.apache.log4j.PatternLayout">
      &lt;param name="ConversionPattern" value="%c{1} - %m%n"/>
    &lt;/layout>
  &lt;/appender>

  &lt;root">
    &lt;appender-ref ref="ROLL"/>
  &lt;/root>

&lt;/log4j:configuration>
</pre>

 *<p>This configuration file specifies a monthly rollover schedule including
 * automatic compression of the archived files. See
 * {@link TimeBasedRollingPolicy} for more details.
 *
 * @author Heinz Richter
 * @author Ceki G&uuml;lc&uuml;
 * @since  1.3
 * */
public final class RollingFileAppender extends FileAppender {
  /**
   * Triggering policy.
   */
  private TriggeringPolicy triggeringPolicy;

  /**
   * Rolling policy.
   */
  private RollingPolicy rollingPolicy;

  /**
   * Length of current active log file.
   */
  private long fileLength = 0;

  /**
   * Asynchronous action (like compression) from previous rollover.
   */
  private Action lastRolloverAsyncAction = null;

  /**
   * Construct a new instance.
   */
  public RollingFileAppender() {
  }

  /**
   * Prepare instance of use.
   */
  public void activateOptions() {
    if (rollingPolicy == null) {
      getLogger().warn(
        "Please set a rolling policy for the RollingFileAppender named '{}'",
        getName());

        return;
    }

    //
    //  if no explicit triggering policy and rolling policy is both.
    //
    if (
      (triggeringPolicy == null) && rollingPolicy instanceof TriggeringPolicy) {
      triggeringPolicy = (TriggeringPolicy) rollingPolicy;
    }

    if (triggeringPolicy == null) {
      getLogger().warn(
        "Please set a TriggeringPolicy for the RollingFileAppender named '{}'",
        getName());

      return;
    }

    Exception exception = null;

    synchronized (this) {
      triggeringPolicy.activateOptions();
      rollingPolicy.activateOptions();

      try {
        RolloverDescription rollover =
          rollingPolicy.initialize(getFile(), getAppend());

        if (rollover != null) {
          Action syncAction = rollover.getSynchronous();

          if (syncAction != null) {
            syncAction.execute();
          }

          setFile(rollover.getActiveFileName());
          setAppend(rollover.getAppend());
          lastRolloverAsyncAction = rollover.getAsynchronous();

          if (lastRolloverAsyncAction != null) {
            Thread runner = new Thread(lastRolloverAsyncAction);
            runner.start();
          }
        }

        File activeFile = new File(getFile());

        if (getAppend()) {
          fileLength = activeFile.length();
        } else {
          fileLength = 0;
        }

        super.activateOptions();
      } catch (Exception ex) {
        exception = ex;
      }
    }

    if (exception != null) {
      getLogger().warn(
        "Exception while initializing RollingFileAppender named '" + getName()
        + "'", exception);
    }
  }

  /**
     Implements the usual roll over behaviour.

     <p>If <code>MaxBackupIndex</code> is positive, then files
     {<code>File.1</code>, ..., <code>File.MaxBackupIndex -1</code>}
     are renamed to {<code>File.2</code>, ...,
     <code>File.MaxBackupIndex</code>}. Moreover, <code>File</code> is
     renamed <code>File.1</code> and closed. A new <code>File</code> is
     created to receive further log output.

     <p>If <code>MaxBackupIndex</code> is equal to zero, then the
     <code>File</code> is truncated with no backup files created.

   * @return true if rollover performed.
   */
  public boolean rollover() {
    //
    //   can't roll without a policy
    //
    if (rollingPolicy != null) {
      Exception exception = null;

      synchronized (this) {
        //
        //   if a previous async task is still running
        //}
        if (lastRolloverAsyncAction != null) {
          //
          //  block until complete
          //
          lastRolloverAsyncAction.close();

          //
          //    or don't block and return to rollover later
          //
          //if (!lastRolloverAsyncAction.isComplete()) return false;
        }

        try {
          RolloverDescription rollover = rollingPolicy.rollover(getFile());

          if (rollover != null) {
            if (rollover.getActiveFileName().equals(getFile())) {
              closeWriter();

              boolean success = true;

              if (rollover.getSynchronous() != null) {
                success = false;

                try {
                  success = rollover.getSynchronous().execute();
                } catch (Exception ex) {
                  exception = ex;
                }
              }

              if (success) {
                if (rollover.getAppend()) {
                  fileLength = new File(rollover.getActiveFileName()).length();
                } else {
                  fileLength = 0;
                }

                if (rollover.getAsynchronous() != null) {
                  lastRolloverAsyncAction = rollover.getAsynchronous();
                  new Thread(lastRolloverAsyncAction).start();
                }

                setFile(
                  rollover.getActiveFileName(), rollover.getAppend(),
                  bufferedIO, bufferSize);
              } else {
                setFile(
                  rollover.getActiveFileName(), true, bufferedIO, bufferSize);

                if (exception == null) {
                  getLogger().warn("Failure in post-close rollover action");
                } else {
                  getLogger().warn(
                    "Exception in post-close rollover action", exception);
                }
              }
            } else {
              Writer newWriter =
                createWriter(
                  new FileOutputStream(
                    rollover.getActiveFileName(), rollover.getAppend()));
              closeWriter();
              setFile(rollover.getActiveFileName());
              this.qw = createQuietWriter(newWriter);

              boolean success = true;

              if (rollover.getSynchronous() != null) {
                success = false;

                try {
                  success = rollover.getSynchronous().execute();
                } catch (Exception ex) {
                  exception = ex;
                }
              }

              if (success) {
                if (rollover.getAppend()) {
                  fileLength = new File(rollover.getActiveFileName()).length();
                } else {
                  fileLength = 0;
                }

                if (rollover.getAsynchronous() != null) {
                  lastRolloverAsyncAction = rollover.getAsynchronous();
                  new Thread(lastRolloverAsyncAction).start();
                }
              }

              writeHeader();
            }

            return true;
          }
        } catch (Exception ex) {
          exception = ex;
        }
      }

      if (exception != null) {
        getLogger().warn(
          "Exception during rollover, rollover deferred.", exception);
      }
    }

    return false;
  }

  /**
   * {@inheritDoc}
  */
  protected void subAppend(final LoggingEvent event) {
    // The rollover check must precede actual writing. This is the 
    // only correct behavior for time driven triggers. 
    if (
      triggeringPolicy.isTriggeringEvent(
          this, event, getFile(), getFileLength())) {
      //
      //   wrap rollover request in try block since
      //    rollover may fail in case read access to directory
      //    is not provided.  However appender should still be in good
      //     condition and the append should still happen.
      try {
        rollover();
      } catch (Exception ex) {
          getLogger().info("Exception during rollover attempt.", ex);
      }
    }

    super.subAppend(event);
  }

  /**
   * Get rolling policy.
   * @return rolling policy.
   */
  public RollingPolicy getRollingPolicy() {
    return rollingPolicy;
  }

  /**
   * Get triggering policy.
   * @return triggering policy.
   */
  public TriggeringPolicy getTriggeringPolicy() {
    return triggeringPolicy;
  }

  /**
   * Sets the rolling policy.
   * @param policy rolling policy.
   */
  public void setRollingPolicy(final RollingPolicy policy) {
    rollingPolicy = policy;
  }

  /**
   * Set triggering policy.
   * @param policy triggering policy.
   */
  public void setTriggeringPolicy(final TriggeringPolicy policy) {
    triggeringPolicy = policy;
  }

  /**
   * Close appender.  Waits for any asynchronous file compression actions to be completed.
   */
  public void close() {
    synchronized (this) {
      if (lastRolloverAsyncAction != null) {
        lastRolloverAsyncAction.close();
      }
    }

    super.close();
  }

  /**
     Returns an OutputStreamWriter when passed an OutputStream.  The
     encoding used will depend on the value of the
     <code>encoding</code> property.  If the encoding value is
     specified incorrectly the writer will be opened using the default
     system encoding (an error message will be printed to the loglog.
   @param os output stream, may not be null.
   @return new writer.
   */
  protected OutputStreamWriter createWriter(final OutputStream os) {
    return super.createWriter(new CountingOutputStream(os, this));
  }

  /**
   * Get byte length of current active log file.
   * @return byte length of current active log file.
   */
  public long getFileLength() {
    return fileLength;
  }

  /**
   * Increments estimated byte length of current active log file.
   * @param increment additional bytes written to log file.
   */
  public void incrementFileLength(int increment) {
    fileLength += increment;
  }

  /**
   * Wrapper for OutputStream that will report all write
   * operations back to this class for file length calculations.
   */
  private static class CountingOutputStream extends OutputStream {
    /**
     * Wrapped output stream.
     */
    private final OutputStream os;

    /**
     * Rolling file appender to inform of stream writes.
     */
    private final RollingFileAppender rfa;

    /**
     * Constructor.
     * @param os output stream to wrap.
     * @param rfa rolling file appender to inform.
     */
    public CountingOutputStream(
      final OutputStream os, final RollingFileAppender rfa) {
      this.os = os;
      this.rfa = rfa;
    }

    /**
     * {@inheritDoc}
     */
    public void close() throws IOException {
      os.close();
    }

    /**
     * {@inheritDoc}
     */
    public void flush() throws IOException {
      os.flush();
    }

    /**
     * {@inheritDoc}
     */
    public void write(final byte[] b) throws IOException {
      os.write(b);
      rfa.incrementFileLength(b.length);
    }

    /**
     * {@inheritDoc}
     */
    public void write(final byte[] b, final int off, final int len)
      throws IOException {
      os.write(b, off, len);
      rfa.incrementFileLength(len);
    }

    /**
     * {@inheritDoc}
     */
    public void write(final int b) throws IOException {
      os.write(b);
      rfa.incrementFileLength(1);
    }
  }
}
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