1 /*

     2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.management.jfr;

    27 

    28 import java.io.IOException;

    29 import java.io.InputStream;

    30 import java.util.Date;

    31 import java.util.HashMap;

    32 import java.util.Map;

    33 import java.util.Timer;

    34 import java.util.concurrent.TimeUnit;

    35 

    36 final class StreamManager {

    37 

    38     public static final long TIME_OUT = TimeUnit.MINUTES.toMillis(2);

    39     public static final int DEFAULT_BLOCK_SIZE = 50000;

    40 

    41     private static long idCounter = 0;

    42 

    43     private final Map<Long, Stream> streams = new HashMap<>();

    44     private Timer timer;

    45 

    46     public synchronized Stream getStream(long streamIdentifer) {

    47         Stream stream = streams.get(streamIdentifer);

    48         if (stream == null) {

    49             throw new IllegalArgumentException("Unknown stream identifier " + streamIdentifer);

    50         }

    51         return stream;

    52     }

    53 

    54     public synchronized Stream create(InputStream is, int blockSize) {

    55         idCounter++;

    56         Stream stream = new Stream(is, idCounter, blockSize);

    57         streams.put(stream.getId(), stream);

    58 

    59         scheduleAbort(stream, System.currentTimeMillis() + TIME_OUT);

    60         return stream;

    61     }

    62 

    63     public synchronized void destroy(Stream stream) {

    64         try {

    65             stream.close();

    66         } catch (IOException e) {

    67             // OK

    68         }

    69         streams.remove(stream.getId());

    70         if (streams.isEmpty()) {

    71             timer.cancel();

    72             timer = null;

    73         }

    74     }

    75 

    76     public synchronized void scheduleAbort(Stream s, long when) {

    77         if (timer == null) {

    78             timer = new Timer(true);

    79         }

    80         timer.schedule(new StreamCleanupTask(this, s), new Date(when + TIME_OUT));

    81     }

    82 }