/
EagerStateStore.java
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/
EagerStateStore.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.flink.streaming.api.state;
import java.io.IOException;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.flink.api.common.state.StateCheckpointer;
import org.apache.flink.runtime.state.StateHandle;
import org.apache.flink.runtime.state.StateHandleProvider;
public class EagerStateStore<S, C extends Serializable> implements PartitionedStateStore<S, C> {
private StateCheckpointer<S, C> checkpointer;
private final StateHandleProvider<Serializable> provider;
private Map<Serializable, S> fetchedState;
@SuppressWarnings("unchecked")
public EagerStateStore(StateCheckpointer<S, C> checkpointer, StateHandleProvider<C> provider) {
this.checkpointer = checkpointer;
this.provider = (StateHandleProvider<Serializable>) provider;
fetchedState = new HashMap<Serializable, S>();
}
@Override
public S getStateForKey(Serializable key) throws IOException {
return fetchedState.get(key);
}
@Override
public void setStateForKey(Serializable key, S state) {
fetchedState.put(key, state);
}
@Override
public void removeStateForKey(Serializable key) {
fetchedState.remove(key);
}
@Override
public Map<Serializable, S> getPartitionedState() throws IOException {
return fetchedState;
}
@Override
public StateHandle<Serializable> snapshotStates(long checkpointId, long checkpointTimestamp) {
// we map the values in the state-map using the state-checkpointer and store it as a checkpoint
Map<Serializable, C> checkpoints = new HashMap<Serializable, C>();
for (Entry<Serializable, S> stateEntry : fetchedState.entrySet()) {
checkpoints.put(stateEntry.getKey(),
checkpointer.snapshotState(stateEntry.getValue(), checkpointId, checkpointTimestamp));
}
return provider.createStateHandle((Serializable) checkpoints);
}
@Override
public void restoreStates(StateHandle<Serializable> snapshot, ClassLoader userCodeClassLoader)
throws Exception {
@SuppressWarnings("unchecked")
Map<Serializable, C> checkpoints = (Map<Serializable, C>) snapshot.getState(userCodeClassLoader);
// we map the values back to the state from the checkpoints
for (Entry<Serializable, C> snapshotEntry : checkpoints.entrySet()) {
fetchedState.put(snapshotEntry.getKey(), (S) checkpointer.restoreState(snapshotEntry.getValue()));
}
}
@Override
public boolean containsKey(Serializable key) {
return fetchedState.containsKey(key);
}
@Override
public void setCheckPointer(StateCheckpointer<S, C> checkpointer) {
this.checkpointer = checkpointer;
}
@Override
public String toString() {
return fetchedState.toString();
}
}