binding2/mdsal-binding2-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/javav2/dom/adapter/impl/operation/LazyDOMOperationResultFuture.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.mdsal.binding.javav2.dom.adapter.impl.operation;
   9
  10 import com.google.common.annotations.Beta;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.base.Throwables;
  13 import com.google.common.util.concurrent.CheckedFuture;
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import java.util.concurrent.ExecutionException;
  16 import java.util.concurrent.Executor;
  17 import java.util.concurrent.TimeUnit;
  18 import java.util.concurrent.TimeoutException;
  19 import javax.annotation.Nonnull;
  20 import org.opendaylight.mdsal.binding.javav2.dom.codec.impl.BindingNormalizedNodeCodecRegistry;
  21 import org.opendaylight.mdsal.binding.javav2.spec.base.TreeNode;
  22 import org.opendaylight.mdsal.dom.api.DOMRpcException;
  23 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  24 import org.opendaylight.mdsal.dom.spi.DefaultDOMRpcResult;
  25 import org.opendaylight.yangtools.yang.binding.DataContainer;
  26 import org.opendaylight.yangtools.yang.common.RpcResult;
  27 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  28
  29 /**
  30  * DOM operation result from Binding.
  31  */
  32 @Beta
  33 final class LazyDOMOperationResultFuture implements CheckedFuture<DOMRpcResult, DOMRpcException> {
  34
  35     private final ListenableFuture<RpcResult<?>> bindingFuture;
  36     private final BindingNormalizedNodeCodecRegistry codec;
  37     private volatile DOMRpcResult result;
  38
  39     private LazyDOMOperationResultFuture(final ListenableFuture<RpcResult<?>> delegate,
  40             final BindingNormalizedNodeCodecRegistry codec) {
  41         this.bindingFuture = Preconditions.checkNotNull(delegate, "delegate");
  42         this.codec = Preconditions.checkNotNull(codec, "codec");
  43     }
  44
  45     static CheckedFuture<DOMRpcResult, DOMRpcException> create(final BindingNormalizedNodeCodecRegistry codec,
  46             final ListenableFuture<RpcResult<?>> bindingResult) {
  47         return new LazyDOMOperationResultFuture(bindingResult, codec);
  48     }
  49
  50     ListenableFuture<RpcResult<?>> getBindingFuture() {
  51         return bindingFuture;
  52     }
  53
  54     @Override
  55     public boolean cancel(final boolean mayInterruptIfRunning) {
  56         return bindingFuture.cancel(mayInterruptIfRunning);
  57     }
  58
  59     @Override
  60     public void addListener(@Nonnull final Runnable listener, @Nonnull final Executor executor) {
  61         bindingFuture.addListener(listener, executor);
  62     }
  63
  64     @Override
  65     public DOMRpcResult get() throws InterruptedException, ExecutionException {
  66         if (result != null) {
  67             return result;
  68         }
  69         return transformIfNecessary(bindingFuture.get());
  70     }
  71
  72     @Override
  73     public DOMRpcResult get(@Nonnull final long timeout, final TimeUnit unit)
  74             throws InterruptedException, ExecutionException, TimeoutException {
  75         if (result != null) {
  76             return result;
  77         }
  78         return transformIfNecessary(bindingFuture.get(timeout, unit));
  79     }
  80
  81     @Override
  82     public DOMRpcResult checkedGet() throws DOMRpcException {
  83         try {
  84             return get();
  85         } catch (InterruptedException | ExecutionException e) {
  86             // FIXME: Add exception mapping
  87             throw Throwables.propagate(e);
  88         }
  89     }
  90
  91     @Override
  92     public DOMRpcResult checkedGet(@Nonnull final long timeout, final TimeUnit unit)
  93             throws TimeoutException, DOMRpcException {
  94         try {
  95             return get(timeout, unit);
  96         } catch (InterruptedException | ExecutionException e) {
  97             // FIXME: Add exception mapping
  98             throw Throwables.propagate(e);
  99         }
 100     }
 101
 102     @Override
 103     public boolean isCancelled() {
 104         return bindingFuture.isCancelled();
 105     }
 106
 107     @Override
 108     public boolean isDone() {
 109         return bindingFuture.isDone();
 110     }
 111
 112     private synchronized DOMRpcResult transformIfNecessary(final RpcResult<?> input) {
 113         if (result == null) {
 114             result = transform(input);
 115         }
 116         return result;
 117     }
 118
 119     private DOMRpcResult transform(final RpcResult<?> input) {
 120         if (input.isSuccessful()) {
 121             final Object inputData = input.getResult();
 122             if (inputData instanceof DataContainer) {
 123                 return new DefaultDOMRpcResult(codec.toNormalizedNodeOperationData((TreeNode) inputData));
 124             } else {
 125                 return new DefaultDOMRpcResult((NormalizedNode<?, ?>) null);
 126             }
 127         }
 128         return new DefaultDOMRpcResult(input.getErrors());
 129     }
 130
 131 }