1 /*

     2  * Copyright (c) 2019, 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 package jdk.jfr.internal.consumer;

    26 

    27 import java.util.HashMap;

    28 import java.util.List;

    29 import java.util.Map;

    30 

    31 import jdk.jfr.EventType;

    32 import jdk.jfr.ValueDescriptor;

    33 

    34 public final class ObjectContext {

    35     private final Map<ValueDescriptor, ObjectContext> contextLookup;

    36 

    37     public final EventType eventType;

    38     public final List<ValueDescriptor> fields;

    39     public final TimeConverter timeConverter;

    40 

    41     public ObjectContext(EventType eventType, List<ValueDescriptor> fields, TimeConverter timeConverter) {

    42         this.contextLookup = new HashMap<>();

    43         this.eventType = eventType;

    44         this.fields = fields;

    45         this.timeConverter = timeConverter;

    46     }

    47 

    48     private ObjectContext(ObjectContext parent, ValueDescriptor descriptor) {

    49         this.eventType = parent.eventType;

    50         this.contextLookup = parent.contextLookup;

    51         this.timeConverter = parent.timeConverter;

    52         this.fields = descriptor.getFields();

    53     }

    54 

    55     public ObjectContext getInstance(ValueDescriptor descriptor) {

    56         ObjectContext context = contextLookup.get(descriptor);

    57         if (context == null) {

    58             context = new ObjectContext(this, descriptor);

    59             contextLookup.put(descriptor, context);

    60         }

    61         return context;

    62     }

    63 }