dalvik.system

Class BlockGuard

java.lang.Object

dalvik.system.BlockGuard

public final class BlockGuard
extends Object

Mechanism to let threads set restrictions on what code is allowed to do in their thread.

This is meant for applications to prevent certain blocking operations from running on their main event loop (or "UI") threads.

Note that this is all best-effort to catch most accidental mistakes and isn't intended to be a perfect mechanism, nor provide any sort of security.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BlockGuard.BlockGuardPolicyException
static interface	BlockGuard.Policy

Field Summary

Fields

Modifier and Type	Field and Description
static int	DISALLOW_DISK_READ
static int	DISALLOW_DISK_WRITE
static int	DISALLOW_NETWORK
static BlockGuard.Policy	LAX_POLICY The default, permissive policy that doesn't prevent any operations.
static int	PASS_RESTRICTIONS_VIA_RPC
static int	PENALTY_DEATH
static int	PENALTY_DIALOG
static int	PENALTY_LOG

Method Summary

Modifier and Type	Method and Description
static BlockGuard.Policy	getThreadPolicy() Get the current thread's policy.
static void	setThreadPolicy(BlockGuard.Policy policy) Sets the current thread's block guard policy.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DISALLOW_DISK_WRITE

public static final int DISALLOW_DISK_WRITE

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Constant Field Values

DISALLOW_DISK_READ

public static final int DISALLOW_DISK_READ

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Constant Field Values

DISALLOW_NETWORK

public static final int DISALLOW_NETWORK

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Constant Field Values

PASS_RESTRICTIONS_VIA_RPC

public static final int PASS_RESTRICTIONS_VIA_RPC

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Constant Field Values

PENALTY_LOG

public static final int PENALTY_LOG

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Constant Field Values

PENALTY_DIALOG

public static final int PENALTY_DIALOG

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Constant Field Values

PENALTY_DEATH

public static final int PENALTY_DEATH

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Constant Field Values

LAX_POLICY

public static final BlockGuard.Policy LAX_POLICY

The default, permissive policy that doesn't prevent any operations.

Method Detail

getThreadPolicy

public static BlockGuard.Policy getThreadPolicy()

Get the current thread's policy.

Returns:

the current thread's policy. Never returns null. Will return the LAX_POLICY instance if nothing else is set.

setThreadPolicy

public static void setThreadPolicy(BlockGuard.Policy policy)

Sets the current thread's block guard policy.

Parameters:

policy - policy to set. May not be null. Use the public LAX_POLICY if you want to unset the active policy.