201: Remove JpsPersistentHashMap (bunched)

build-common/src/org/jetbrains/kotlin/incremental/storage/NonCachingLazyStorage.kt.201

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.incremental.storage
+
+import com.intellij.util.io.DataExternalizer
+import com.intellij.util.io.KeyDescriptor
+import com.intellij.util.io.PersistentHashMap
+import java.io.File
+
+
+class NonCachingLazyStorage<K, V>(
+    private val storageFile: File,
+    private val keyDescriptor: KeyDescriptor<K>,
+    private val valueExternalizer: DataExternalizer<V>
+) : LazyStorage<K, V> {
+    @Volatile
+    private var storage: PersistentHashMap<K, V>? = null
+
+    @Synchronized
+    private fun getStorageIfExists(): PersistentHashMap<K, V>? {
+        if (storage != null) return storage
+
+        if (storageFile.exists()) {
+            storage = createMap()
+            return storage
+        }
+
+        return null
+    }
+
+    @Synchronized
+    private fun getStorageOrCreateNew(): PersistentHashMap<K, V> {
+        if (storage == null) {
+            storage = createMap()
+        }
+
+        return storage!!
+    }
+
+    override val keys: Collection<K>
+        get() = getStorageIfExists()?.allKeysWithExistingMapping ?: listOf()
+
+    override operator fun contains(key: K): Boolean =
+        getStorageIfExists()?.containsMapping(key) ?: false
+
+    override operator fun get(key: K): V? =
+        getStorageIfExists()?.get(key)
+
+    override operator fun set(key: K, value: V) {
+        getStorageOrCreateNew().put(key, value)
+    }
+
+    override fun remove(key: K) {
+        getStorageIfExists()?.remove(key)
+    }
+
+    override fun append(key: K, value: V) {
+        getStorageOrCreateNew().appendData(key) { dataOutput -> valueExternalizer.save(dataOutput, value) }
+    }
+
+    @Synchronized
+    override fun clean() {
+        try {
+            storage?.close()
+        } catch (ignored: Throwable) {
+        }
+
+        PersistentHashMap.deleteFilesStartingWith(storageFile)
+        storage = null
+    }
+
+    @Synchronized
+    override fun flush(memoryCachesOnly: Boolean) {
+        val existingStorage = storage ?: return
+
+        if (memoryCachesOnly) {
+            if (existingStorage.isDirty) {
+                existingStorage.dropMemoryCaches()
+            }
+        } else {
+            existingStorage.force()
+        }
+    }
+
+    @Synchronized
+    override fun close() {
+        storage?.close()
+    }
+
+    private fun createMap(): PersistentHashMap<K, V> =
+        PersistentHashMap(storageFile, keyDescriptor, valueExternalizer)
+}