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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.prism.impl;
/**
* An interface for tracking the usage of a particular resource from which
* managed resources are allocated.
* A given resource pool may share its underlying space with another
* resource pool, such as the case of allocating textures from the Java
* heap.
* In the case of a shared resource, the {@link used()} and {@link max()}
* methods will return absolute values indicating the amounts used or
* available for all resources that come from the shared pool, but the
* {@link managed()} method will only indicate the amount of the resource
* used for managed resources and the {@link target()} method will return
* the amount of the total shared resource that the allocation methods
* should attempt to stay under.
*
* long newsize = ...; // size of new resource allocation
* if (pool.used() + newsize >= pool.target()) {
* cleanup(pool);
* // possibly multiple passes of increasing aggressiveness
* }
* if (pool.used() + newsize >= pool.max()) {
* throw OOM();
* }
* allocate(newsize);
*
* The amounts and sizes returned from the methods should all be in the
* same units, usually bytes.
*
* @param the type of resource stored in this pool
* @see ManagedResource
*/
public interface ResourcePool {
/**
* Check that all resources are in the correct state for an idle condition
* and free any resources which were disposed from a non-resource thread.
* This method must be called on a thread that is appropriate for disposing
* and managing resources for this resource pool.
* The boolean {@code forgiveStaleLocks} parameter is used to indicate that
* an exceptional condition occurred which caused the caller to abort a
* cycle of resource usage, potentially with outstanding resource locks.
* This method will unlock all non-permanent resources that have outstanding
* locks if {@code forgiveStaleLocks} is {@code true}, or it will print out
* a warning and a resource summary if that parameter is {@code false}.
*
* @param forgiveStaleLocks {@code true} if the caller wishes to forgive
* and unlock all outstanding locks on non-permanent resources
*/
public void freeDisposalRequestedAndCheckResources(boolean forgiveStaleLocks);
/**
* True if Thread.currentThread() is a thread that created this ResourcePool
* @return true if Thread.currentThread() is a thread that created this ResourcePool
*/
public boolean isManagerThread();
/**
* The amount of a resource currently being used to hold any kind of
* resource, whether managed or not.
* @return the amount being used
*/
public long used();
/**
* The amount of this resource currently being used to hold managed
* resources.
* This amount may be less than the amount returned by the {@link used()}
* method if the pool is shared amongst other resources.
* @return the amount being used to hold managed resources
*/
public long managed();
/**
* The total space available in this pool for allocating any kind of
* resource, even unmanaged resources, and including those resources
* already allocated.
* @return the maximum amount of the resource
*/
public long max();
/**
* The current target of the maximum amount of space in this resource pool
* that should be used so as to be friendly to other parts of the system.
* This number must be less than or equal to the amount returned by the
* {@link max()} method, larger than the amount returned by the
* {@link origTarget()} method, and may change over time.
* @return the current target amount of the resource to be used
* @see #setTarget(long)
*/
public long target();
/**
* The initial target of the maximum amount of space in this resource pool
* that should be used so as to be friendly to other parts of the system.
* This number must be less than or equal to the amount returned by the
* {@link max()} method.
* @return the initial target amount of the resource to be used
*/
public long origTarget();
/**
* Sets a new current target of the maximum amount of space in this
* resource pool that should be used so as to be friendly to other parts
* of the system.
* The specified {@code newTarget} number must be less than or equal to
* the amount returned by the {@link max()} method, larger than the amount
* returned by the {@link origTarget()} method.
* @param newTarget the new current target to be set
*/
public void setTarget(long newTarget);
/**
* The estimated size of the indicated resource.
*
* @param resource the resource to be measured
* @return the space within this resource pool that the object occupies.
*/
public long size(T resource);
/**
* Record the indicated amount of the resource as being allocated for
* a {@link ManagedResource}.
*
* @param size the amount of the resource to be indicated as managed.
*/
public void recordAllocated(long size);
/**
* Record the indicated amount of the resource as no longer being
* held in a {@link ManagedResource}.
*
* @param size the amount of the resource to remove from the managed amount.
*/
public void recordFree(long size);
/**
* Record the {@link ManagedResource} object as being currently managed
* by this pool.
*
* @param resource the resource that is now being managed
*/
public void resourceManaged(ManagedResource resource);
/**
* Record the {@link ManagedResource} object as no longer being managed
* by this pool.
*
* @param resource the resource that is freed, no longer being managed
*/
public void resourceFreed(ManagedResource resource);
/**
* Prepare for an allocation of a resource from this pool of the
* indicated size by freeing up uninteresting resources until the
* allocation fits within the target() or max() sizes.
*
* @param size the size of the resource that is about to be allocated
* @return true if there is room for the indicated resource
*/
public boolean prepareForAllocation(long size);
}