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Oracle Coherence Community Edition
/*
* Copyright (c) 2000, 2021, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.tangosol.persistence;
import com.oracle.coherence.common.base.Collector;
import com.oracle.coherence.common.base.Continuation;
import com.oracle.coherence.persistence.PersistenceEnvironment;
import com.oracle.coherence.persistence.PersistenceManager;
import com.oracle.coherence.persistence.PersistentStore;
import com.tangosol.util.Base;
import com.tangosol.util.NullImplementation;
import com.tangosol.util.NullImplementation.NullPersistenceEnvironment;
import com.tangosol.util.NullImplementation.NullPersistenceManager;
import com.tangosol.util.NullImplementation.NullPersistentStore;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* SafePersistenceWrappers provides safe wrapper implementations of persistence
* layer interfaces that can be used to consolidate error handling across the
* various persistence layers.
*
* @since Coherence 12.1.3
* @author rhl/jh 2013.07.18
*/
public class SafePersistenceWrappers
{
// ----- static helpers -------------------------------------------------
/**
* Return the underlying (non-"Safe") PersistenceEnvironment.
*
* @param env a PersistenceEnvironment
* @param the type of a raw, environment specific object representation
*
* @return the underlying PersistenceEnvironment implementation
*/
public static PersistenceEnvironment unwrap(PersistenceEnvironment env)
{
while (env instanceof SafePersistenceEnvironment)
{
env = ((SafePersistenceEnvironment) env).getEnvironment();
}
return env;
}
/**
* Return the underlying (non-"Safe") PersistenceManager.
*
* @param mgr a PersistenceManager
* @param the type of a raw, environment specific object representation
*
* @return the underlying PersistenceManager implementation
*/
public static PersistenceManager unwrap(PersistenceManager mgr)
{
while (mgr instanceof SafePersistenceManager)
{
mgr = ((SafePersistenceManager) mgr).getManager();
}
return mgr;
}
/**
* Return the underlying (non-"Safe") PersistentStore.
*
* @param store a PersistentStore
* @param the type of a raw, environment specific object representation
*
* @return the underlying PersistentStore implementation
*/
public static PersistentStore unwrap(PersistentStore store)
{
while (store instanceof SafePersistentStore)
{
store = ((SafePersistentStore) store).getStore();
}
return store;
}
/**
* Return a simple FailureContinuationFactory that uses the specified failure
* continuation to handle failures at any layer of the persistence
* implementation.
*
* @param cont the failure continuation
* @param the type of a raw, environment specific object representation
* @param the type of a Throwable failure to protect
*
* @return a simple FailureContinuationFactory that uses a single common
* failure continuation
*/
protected static FailureContinuationFactory getSimpleFactory(final Continuation cont)
{
return new FailureContinuationFactory()
{
public Continuation getEnvironmentContinuation(PersistenceEnvironment env)
{
return cont;
}
public Continuation getManagerContinuation(PersistenceManager mgr)
{
return cont;
}
public Continuation getStoreContinuation(PersistentStore store)
{
return cont;
}
};
}
// ----- inner class: SafePersistenceEnvironment ------------------------
/**
* SafePersistenceEnvironment is a wrapper PersistenceEnvironment implementation
* which protects all operations on the underlying environment (and any
* PersistenceManger or PersistentStore instances opened through this environment)
* from unexpected failures, delegating the exception handling to a failure
* {@link Continuation}.
*
* @param the type of a raw, environment specific object representation
* @param the type of a Throwable failure to protect
*/
public static class SafePersistenceEnvironment
extends NullPersistenceEnvironment
{
// ----- constructors -----------------------------------------------
/**
* Construct a PersistenceEnvironment backed by the specified environment.
*
* @param env the underlying PersistenceEnvironment
*/
public SafePersistenceEnvironment(PersistenceEnvironment env)
{
this(env, DEFAULT_FACTORY);
}
/**
* Construct a PersistenceEnvironment backed by the specified environment.
*
* @param env the underlying PersistenceEnvironment
* @param cont the failure continuation to use to handle unexpected exceptions
*/
public SafePersistenceEnvironment(PersistenceEnvironment env, Continuation cont)
{
this(env, getSimpleFactory(cont));
}
/**
* Construct a PersistenceEnvironment backed by the specified environment.
*
* @param env the underlying PersistenceEnvironment
* @param factory the failure continuation factory to use to create handlers
* for unexpected exceptions
*/
public SafePersistenceEnvironment(PersistenceEnvironment env, FailureContinuationFactory factory)
{
f_env = env;
f_factoryCont = factory;
f_contFailure = factory.getEnvironmentContinuation(env);
}
// ----- accessors --------------------------------------------------
/**
* Return the underlying PersistenceEnvironment.
*
* @return the underlying PersistenceEnvironment
*/
public PersistenceEnvironment getEnvironment()
{
return f_env;
}
// ----- internal methods -------------------------------------------
/**
* Called to handle an unexpected exception.
*
* @param t the Throwable
*/
protected void onException(T t)
{
f_contFailure.proceed(t);
}
/**
* Wrap the specified manager in a SafePersistenceManager implementation.
*
* @param mgr the underlying PersistenceManger
*
* @return a "safe" PersistenceManger or null if the specified
* manager is null
*/
protected PersistenceManager wrap(PersistenceManager mgr)
{
return mgr == null ? null : new SafePersistenceManager<>(mgr, f_factoryCont);
}
// ----- PersistenceEnvironment methods -----------------------------
/**
* {@inheritDoc}
*/
public PersistenceManager openActive()
{
try
{
return wrap(getEnvironment().openActive());
}
catch (Throwable t)
{
onException((T) t);
}
return NullImplementation.getPersistenceManager();
}
/**
* {@inheritDoc}
*/
public PersistenceManager openSnapshot(String sSnapshot)
{
try
{
return wrap(getEnvironment().openSnapshot(sSnapshot));
}
catch (Throwable t)
{
onException((T) t);
}
return NullImplementation.getPersistenceManager();
}
/**
* {@inheritDoc}
*/
public PersistenceManager createSnapshot(String sSnapshot, PersistenceManager manager)
{
try
{
return wrap(getEnvironment().createSnapshot(sSnapshot, unwrap(manager)));
}
catch (Throwable t)
{
onException((T) t);
}
return NullImplementation.getPersistenceManager();
}
/**
* {@inheritDoc}
*/
public boolean removeSnapshot(String sSnapshot)
{
try
{
return getEnvironment().removeSnapshot(sSnapshot);
}
catch (Throwable t)
{
onException((T) t);
}
return super.removeSnapshot(sSnapshot);
}
/**
* {@inheritDoc}
*/
public String[] listSnapshots()
{
try
{
return getEnvironment().listSnapshots();
}
catch (Throwable t)
{
onException((T) t);
}
return super.listSnapshots();
}
/**
* {@inheritDoc}
*/
public void release()
{
try
{
getEnvironment().release();
}
catch (Throwable t)
{
onException((T) t);
}
}
// ----- Object methods ---------------------------------------------
/**
* Return a human readable description of this SafePersistenceEnvironment.
*
* @return a human readable description
*/
@Override
public String toString()
{
return "Safe" + String.valueOf(getEnvironment());
}
// ----- data members -----------------------------------------------
/**
* The underlying PersistenceEnvironment.
*/
protected final PersistenceEnvironment f_env;
/**
* The failure continuation for this environment.
*/
protected final Continuation f_contFailure;
/**
* The FailureContinuationFactory.
*/
protected final FailureContinuationFactory f_factoryCont;
}
// ----- inner class: SafePersistenceManager ----------------------------
/**
* SafePersistenceManager is a wrapper PersistenceManager implementation which
* protects all operations on the underlying manager (and any PersistentStore
* instances opened by the manager) from unexpected failures, delegating
* the exception handling to a failure {@link Continuation}.
*
* @param the type of a raw, environment specific object representation
* @param the type of a Throwable failure to protect
*/
public static class SafePersistenceManager
extends NullPersistenceManager
{
// ----- constructors -----------------------------------------------
/**
* Construct a SafePersistenceManager backed by the specified manager.
*
* @param mgr the underlying PersistenceManager
*/
public SafePersistenceManager(PersistenceManager mgr)
{
this(mgr, DEFAULT_FACTORY);
}
/**
* Construct a SafePersistenceManager backed by the specified manager.
*
* @param mgr the underlying PersistenceManager
* @param cont the failure continuation to use to handle unexpected exceptions
*/
public SafePersistenceManager(PersistenceManager mgr, Continuation cont)
{
this(mgr, getSimpleFactory(cont));
}
/**
* Construct a PersistenceManager backed by the specified manager.
*
* @param mgr the underlying PersistenceManager
* @param factory the failure continuation factory to use to create handlers
* for unexpected exceptions
*/
public SafePersistenceManager(PersistenceManager mgr, FailureContinuationFactory factory)
{
f_manager = mgr;
f_factoryCont = factory;
f_contFailure = factory.getManagerContinuation(mgr);
}
// ----- accessors --------------------------------------------------
/**
* Return the underlying PersistenceManager.
*
* @return the underlying PersistenceManager
*/
public PersistenceManager getManager()
{
return f_manager;
}
// ----- internal methods -------------------------------------------
/**
* Called to handle an unexpected exception.
*
* @param t the Throwable
*/
public void onException(T t)
{
f_contFailure.proceed(t);
}
/**
* Wrap the specified store in a SafePersistentStore implementation.
*
* @param store the underlying PersistentStore
*
* @return a "safe" PersistenceManger or null if the specified store
* is null
*/
protected PersistentStore wrap(PersistentStore store)
{
return store == null ? null : new SafePersistentStore<>(store, f_factoryCont);
}
// ----- PersistenceManager methods ---------------------------------
/**
* {@inheritDoc}
*/
public String getName()
{
try
{
return getManager().getName();
}
catch (Throwable t)
{
onException((T) t);
}
return super.getName();
}
/**
* {@inheritDoc}
*/
public PersistentStore createStore(String sId)
{
try
{
return wrap(getManager().createStore(sId));
}
catch (Throwable t)
{
onException((T) t);
}
return null;
}
/**
* {@inheritDoc}
*/
public PersistentStore open(String sId, PersistentStore store)
{
try
{
return wrap(getManager().open(sId, store));
}
catch (Throwable t)
{
onException((T) t);
}
return super.open(sId, store);
}
/**
* {@inheritDoc}
*/
public PersistentStore open(String sId, PersistentStore store, Collector