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java.lang.Object java.lang.Enum<JvmInformation> net.sf.ehcache.pool.sizeof.JvmInformation
public enum JvmInformation
Detects and represents JVM-specific properties that relate to the memory data model for java objects that are useful for size of calculations.
Enum Constant Summary | |
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HOTSPOT_32_BIT
Represents HotSpot 32-bit |
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HOTSPOT_32_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
Represents 32-Bit HotSpot JVM with Concurrent Mark-and-Sweep GC |
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HOTSPOT_64_BIT
Represents 64-Bit HotSpot JVM |
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HOTSPOT_64_BIT_WITH_COMPRESSED_OOPS
Represents 64-Bit HotSpot JVM with Compressed OOPs |
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HOTSPOT_64_BIT_WITH_COMPRESSED_OOPS_AND_CONCURRENT_MARK_AND_SWEEP
Represents 64-Bit HotSpot JVM with Compressed OOPs and Concurrent Mark-and-Sweep GC |
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HOTSPOT_64_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
Represents 64-Bit HotSpot JVM with Concurrent Mark-and-Sweep GC |
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IBM_32_BIT
Represents IBM 32-bit |
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IBM_64_BIT
Represents 64-Bit IBM JVM (with no reference compression) |
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IBM_64_BIT_WITH_COMPRESSED_REFS
Represents 64-Bit IBM JVM (with reference compression) |
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JROCKIT_32_BIT
Represents 32-Bit JRockit JVM" |
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JROCKIT_64_BIT
Represents 64-Bit JRockit JVM (with no reference compression) |
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JROCKIT_64_BIT_WITH_64GB_COMPRESSED_REFS
Represents 64-Bit JRockit JVM with 64GB Compressed References |
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OPENJDK_32_BIT
Represents OpenJDK 32-bit |
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OPENJDK_32_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
Represents 32-Bit OpenJDK JVM with Concurrent Mark-and-Sweep GC |
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OPENJDK_64_BIT
Represents 64-Bit OpenJDK JVM |
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OPENJDK_64_BIT_WITH_COMPRESSED_OOPS
Represents 64-Bit OpenJDK JVM with Compressed OOPs |
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OPENJDK_64_BIT_WITH_COMPRESSED_OOPS_AND_CONCURRENT_MARK_AND_SWEEP
Represents 64-Bit OpenJDK JVM with Compressed OOPs and Concurrent Mark-and-Sweep GC |
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OPENJDK_64_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
Represents 64-Bit OpenJDK JVM with Concurrent Mark-and-Sweep GC |
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UNKNOWN_32_BIT
Represents Generic 32-bit |
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UNKNOWN_64_BIT
Represents 64-Bit Generic JVM |
Field Summary | |
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static JvmInformation |
CURRENT_JVM_INFORMATION
The JvmInformation instance representing the current JVM |
Method Summary | |
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int |
getAgentSizeOfAdjustment()
The size of the jvm-specific agent result adjustment in bytes. |
int |
getFieldOffsetAdjustment()
The size of the jvm-specific field offset adjustment in bytes. |
int |
getJavaPointerSize()
Size of a java pointer in bytes on this runtime (that differs when compressedOops are being used) |
abstract String |
getJvmDescription()
A human-readable description of the JVM and its relevant enabled options.Os |
int |
getMinimumObjectSize()
Minimal size an object will occupy on the heap in bytes. |
int |
getObjectAlignment()
Object alignment / padding in bytes |
int |
getObjectHeaderSize()
The size of an object header in bytes. |
int |
getPointerSize()
Size of a pointer in bytes on this runtime |
static boolean |
isHotspot()
Returns true if VM vendor is Hotspot |
static boolean |
isIBM()
Returns true if VM vendor is IBM |
static boolean |
isJRockit()
Returns true if VM is JRockit |
static boolean |
isOpenJDK()
Returns true if VM vendor is OpenJDK |
static boolean |
isOSX()
Return true if the VM's vendor is Apple |
boolean |
supportsAgentSizeOf()
Whether the jvm can support AgentSizeOf implementation. |
boolean |
supportsReflectionSizeOf()
Whether the jvm can support ReflectionSizeOf implementation. |
boolean |
supportsUnsafeSizeOf()
Whether the jvm can support UnsafeSizeOf implementation. |
static JvmInformation |
valueOf(String name)
Returns the enum constant of this type with the specified name. |
static JvmInformation[] |
values()
Returns an array containing the constants of this enum type, in the order they are declared. |
Methods inherited from class java.lang.Enum |
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clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf |
Methods inherited from class java.lang.Object |
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getClass, notify, notifyAll, wait, wait, wait |
Enum Constant Detail |
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public static final JvmInformation UNKNOWN_32_BIT
public static final JvmInformation UNKNOWN_64_BIT
public static final JvmInformation HOTSPOT_32_BIT
public static final JvmInformation HOTSPOT_32_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
public static final JvmInformation HOTSPOT_64_BIT
public static final JvmInformation HOTSPOT_64_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
public static final JvmInformation HOTSPOT_64_BIT_WITH_COMPRESSED_OOPS
public static final JvmInformation HOTSPOT_64_BIT_WITH_COMPRESSED_OOPS_AND_CONCURRENT_MARK_AND_SWEEP
public static final JvmInformation OPENJDK_32_BIT
public static final JvmInformation OPENJDK_32_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
public static final JvmInformation OPENJDK_64_BIT
public static final JvmInformation OPENJDK_64_BIT_WITH_CONCURRENT_MARK_AND_SWEEP
public static final JvmInformation OPENJDK_64_BIT_WITH_COMPRESSED_OOPS
public static final JvmInformation OPENJDK_64_BIT_WITH_COMPRESSED_OOPS_AND_CONCURRENT_MARK_AND_SWEEP
public static final JvmInformation JROCKIT_32_BIT
public static final JvmInformation JROCKIT_64_BIT
public static final JvmInformation JROCKIT_64_BIT_WITH_64GB_COMPRESSED_REFS
public static final JvmInformation IBM_32_BIT
public static final JvmInformation IBM_64_BIT
public static final JvmInformation IBM_64_BIT_WITH_COMPRESSED_REFS
Field Detail |
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public static final JvmInformation CURRENT_JVM_INFORMATION
Method Detail |
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public static JvmInformation[] values()
for (JvmInformation c : JvmInformation.values()) System.out.println(c);
public static JvmInformation valueOf(String name)
name
- the name of the enum constant to be returned.
IllegalArgumentException
- if this enum type has no constant
with the specified name
NullPointerException
- if the argument is nullpublic int getPointerSize()
public int getJavaPointerSize()
public int getMinimumObjectSize()
public int getObjectAlignment()
public int getObjectHeaderSize()
public int getFieldOffsetAdjustment()
public int getAgentSizeOfAdjustment()
public boolean supportsAgentSizeOf()
public boolean supportsUnsafeSizeOf()
public boolean supportsReflectionSizeOf()
public abstract String getJvmDescription()
public static boolean isJRockit()
public static boolean isOSX()
public static boolean isHotspot()
public static boolean isOpenJDK()
public static boolean isIBM()
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