How to view and update past graph state

Once you start checkpointing your graphs, you can easily get or update the state of the agent at any point in time. This permits a few things:

1. You can surface a state during an interrupt to a user to let them accept an action.
2. You can rewind the graph to reproduce or avoid issues.
3. You can modify the state to embed your agent into a larger system, or to let the user better control its actions.

The key methods used for this functionality are:

• getState: fetch the values from the target config
• updateState: apply the given values to the target state

Note: this requires passing in a checkpointer.

This works for StateGraph

Below is an example.

String userHomeDir = System.getProperty("user.home");
String localRespoUrl = "file://" + userHomeDir + "/.m2/repository/";
String langchain4jVersion = "0.35.0"

%dependency /add-repo local \{localRespoUrl} release|never snapshot|always
// %dependency /list-repos

Repository local url: file:///Users/bsorrentino/.m2/repository/ added.


Remove installed package from Jupiter cache

%%bash 
rm -rf \{userHomeDir}/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/bsc/langgraph4j

%dependency /add org.slf4j:slf4j-jdk14:2.0.9
%dependency /add org.bsc.langgraph4j:langgraph4j-core-jdk8:1.0-SNAPSHOT
%dependency /add org.bsc.langgraph4j:langgraph4j-langchain4j:1.0-SNAPSHOT
%dependency /add dev.langchain4j:langchain4j:\{langchain4jVersion}
%dependency /add dev.langchain4j:langchain4j-open-ai:\{langchain4jVersion}

%dependency /resolve

Adding dependency org.slf4j:slf4j-jdk14:2.0.9
Adding dependency org.bsc.langgraph4j:langgraph4j-core-jdk8:1.0-SNAPSHOT
Adding dependency org.bsc.langgraph4j:langgraph4j-langchain4j:1.0-SNAPSHOT
Adding dependency dev.langchain4j:langchain4j:0.35.0
Adding dependency dev.langchain4j:langchain4j-open-ai:0.35.0
Solving dependencies
Resolved artifacts count: 26
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Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/slf4j/slf4j-api/2.0.9/slf4j-api-2.0.9.jar
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