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| 33 | PointedEar | 1 | /* |
| 2 | * Hibernate, Relational Persistence for Idiomatic Java |
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| 3 | * |
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| 4 | * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as |
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| 5 | * indicated by the @author tags or express copyright attribution |
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| 6 | * statements applied by the authors. All third-party contributions are |
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| 7 | * distributed under license by Red Hat Middleware LLC. |
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| 8 | * |
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| 9 | * This copyrighted material is made available to anyone wishing to use, modify, |
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| 10 | * copy, or redistribute it subject to the terms and conditions of the GNU |
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| 11 | * Lesser General Public License, as published by the Free Software Foundation. |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 15 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License |
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| 16 | * for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public License |
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| 19 | * along with this distribution; if not, write to: |
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| 20 | * Free Software Foundation, Inc. |
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| 21 | * 51 Franklin Street, Fifth Floor |
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| 22 | * Boston, MA 02110-1301 USA |
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| 23 | * |
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| 24 | */ |
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| 25 | package org.hibernate; |
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| 26 | |||
| 27 | import java.io.Serializable; |
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| 28 | import java.util.HashMap; |
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| 29 | import java.util.Map; |
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| 30 | |||
| 31 | /** |
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| 32 | * Represents a flushing strategy. The flush process synchronizes |
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| 33 | * database state with session state by detecting state changes |
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| 34 | * and executing SQL statements. |
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| 35 | * |
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| 36 | * @see Session#setFlushMode(FlushMode) |
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| 37 | * @see Query#setFlushMode(FlushMode) |
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| 38 | * @see Criteria#setFlushMode(FlushMode) |
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| 39 | * |
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| 40 | * @author Gavin King |
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| 41 | */ |
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| 42 | public final class FlushMode implements Serializable { |
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| 43 | private static final Map INSTANCES = new HashMap(); |
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| 44 | |||
| 45 | private final int level; |
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| 46 | private final String name; |
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| 47 | |||
| 48 | private FlushMode(int level, String name) { |
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| 49 | this.level = level; |
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| 50 | this.name = name; |
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| 51 | } |
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| 52 | |||
| 53 | public String toString() { |
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| 54 | return name; |
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| 55 | } |
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| 56 | |||
| 57 | /** |
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| 58 | * The {@link Session} is never flushed unless {@link Session#flush} |
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| 59 | * is explicitly called by the application. This mode is very |
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| 60 | * efficient for read only transactions. |
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| 61 | * |
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| 62 | * @deprecated use {@link #MANUAL} instead. |
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| 63 | */ |
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| 64 | public static final FlushMode NEVER = new FlushMode( 0, "NEVER" ); |
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| 65 | |||
| 66 | /** |
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| 67 | * The {@link Session} is only ever flushed when {@link Session#flush} |
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| 68 | * is explicitly called by the application. This mode is very |
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| 69 | * efficient for read only transactions. |
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| 70 | */ |
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| 71 | public static final FlushMode MANUAL = new FlushMode( 0, "MANUAL" ); |
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| 72 | |||
| 73 | /** |
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| 74 | * The {@link Session} is flushed when {@link Transaction#commit} |
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| 75 | * is called. |
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| 76 | */ |
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| 77 | public static final FlushMode COMMIT = new FlushMode(5, "COMMIT"); |
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| 78 | |||
| 79 | /** |
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| 80 | * The {@link Session} is sometimes flushed before query execution |
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| 81 | * in order to ensure that queries never return stale state. This |
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| 82 | * is the default flush mode. |
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| 83 | */ |
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| 84 | public static final FlushMode AUTO = new FlushMode(10, "AUTO"); |
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| 85 | |||
| 86 | /** |
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| 87 | * The {@link Session} is flushed before every query. This is |
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| 88 | * almost always unnecessary and inefficient. |
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| 89 | */ |
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| 90 | public static final FlushMode ALWAYS = new FlushMode(20, "ALWAYS"); |
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| 91 | |||
| 92 | public boolean lessThan(FlushMode other) { |
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| 93 | return this.level<other.level; |
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| 94 | } |
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| 95 | |||
| 96 | static { |
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| 97 | INSTANCES.put( NEVER.name, NEVER ); |
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| 98 | INSTANCES.put( MANUAL.name, MANUAL ); |
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| 99 | INSTANCES.put( AUTO.name, AUTO ); |
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| 100 | INSTANCES.put( ALWAYS.name, ALWAYS ); |
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| 101 | INSTANCES.put( COMMIT.name, COMMIT ); |
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| 102 | } |
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| 103 | |||
| 104 | public static boolean isManualFlushMode(FlushMode mode) { |
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| 105 | return MANUAL.level == mode.level; |
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| 106 | } |
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| 107 | |||
| 108 | private Object readResolve() { |
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| 109 | return INSTANCES.get( name ); |
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| 110 | } |
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| 111 | |||
| 112 | public static FlushMode parse(String name) { |
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| 113 | return ( FlushMode ) INSTANCES.get( name ); |
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| 114 | } |
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| 115 | } |