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.util.concurrent.ListenableFuture;
  13 import java.util.concurrent.ExecutionException;
  14 import java.util.concurrent.Executor;
  15 import java.util.concurrent.TimeUnit;
  16 import java.util.concurrent.TimeoutException;
  17 import javax.annotation.Nonnull;
  18 import org.opendaylight.mdsal.binding.javav2.dom.codec.impl.BindingNormalizedNodeCodecRegistry;
  19 import org.opendaylight.mdsal.binding.javav2.spec.base.TreeNode;
  20 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  21 import org.opendaylight.mdsal.dom.spi.DefaultDOMRpcResult;
  22 import org.opendaylight.yangtools.yang.binding.DataContainer;
  23 import org.opendaylight.yangtools.yang.common.RpcResult;
  24 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  25
  26 /**
  27  * DOM operation result from Binding.
  28  */
  29 @Beta
  30 final class LazyDOMOperationResultFuture implements ListenableFuture<DOMRpcResult> {
  31
  32     private final ListenableFuture<RpcResult<?>> bindingFuture;
  33     private final BindingNormalizedNodeCodecRegistry codec;
  34     private volatile DOMRpcResult result;
  35
  36     private LazyDOMOperationResultFuture(final ListenableFuture<RpcResult<?>> delegate,
  37             final BindingNormalizedNodeCodecRegistry codec) {
  38         this.bindingFuture = Preconditions.checkNotNull(delegate, "delegate");
  39         this.codec = Preconditions.checkNotNull(codec, "codec");
  40     }
  41
  42     static ListenableFuture<DOMRpcResult> create(final BindingNormalizedNodeCodecRegistry codec,
  43             final ListenableFuture<RpcResult<?>> bindingResult) {
  44         return new LazyDOMOperationResultFuture(bindingResult, codec);
  45     }
  46
  47     ListenableFuture<RpcResult<?>> getBindingFuture() {
  48         return bindingFuture;
  49     }
  50
  51     @Override
  52     public boolean cancel(final boolean mayInterruptIfRunning) {
  53         return bindingFuture.cancel(mayInterruptIfRunning);
  54     }
  55
  56     @Override
  57     public void addListener(@Nonnull final Runnable listener, @Nonnull final Executor executor) {
  58         bindingFuture.addListener(listener, executor);
  59     }
  60
  61     @Override
  62     public DOMRpcResult get() throws InterruptedException, ExecutionException {
  63         if (result != null) {
  64             return result;
  65         }
  66         return transformIfNecessary(bindingFuture.get());
  67     }
  68
  69     @Override
  70     public DOMRpcResult get(@Nonnull final long timeout, final TimeUnit unit)
  71             throws InterruptedException, ExecutionException, TimeoutException {
  72         if (result != null) {
  73             return result;
  74         }
  75         return transformIfNecessary(bindingFuture.get(timeout, unit));
  76     }
  77
  78     @Override
  79     public boolean isCancelled() {
  80         return bindingFuture.isCancelled();
  81     }
  82
  83     @Override
  84     public boolean isDone() {
  85         return bindingFuture.isDone();
  86     }
  87
  88     private synchronized DOMRpcResult transformIfNecessary(final RpcResult<?> input) {
  89         if (result == null) {
  90             result = transform(input);
  91         }
  92         return result;
  93     }
  94
  95     private DOMRpcResult transform(final RpcResult<?> input) {
  96         if (input.isSuccessful()) {
  97             final Object inputData = input.getResult();
  98             if (inputData instanceof DataContainer) {
  99                 return new DefaultDOMRpcResult(codec.toNormalizedNodeOperationData((TreeNode) inputData));
 100             } else {
 101                 return new DefaultDOMRpcResult((NormalizedNode<?, ?>) null);
 102             }
 103         }
 104         return new DefaultDOMRpcResult(input.getErrors());
 105     }
 106
 107 }